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Oscillation in PSU simulation
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ElectronSurf:
1 mA in 0-1A with three OP07. actually LM324 was showing some good results too, ~±3 mA error considering the resistors error it was good for a cheap op amp but only with a 1 ohm shunt.

Appreciate it if you post an schematic of that RC filter and thanks for all the information.
Zero999:
Here's a schematic I drew up. The problem is the transient response is poor. RL is a time dependant resistor. Its value is suddenly changed from 1k to 1R and the current and voltage are monitored. When the resistor value falls to 1R, the current shoots up, before the current limit kicks in and the voltage spikes, when the value rises to 1k again.

EDIT: I've just noticed the current limit on the schematic at the start of the thread is 1A, whilst on this circuit it's 2A. Obviously just change R2 to 1R for 1A.


 PSU Instr Amp.asc (4.05 kB - downloaded 73 times.)
xavier60:
Would the voltage overshoot be acceptable with 100 milliohms for the CS resistor and 1A maximum load?
Zero999:

--- Quote from: xavier60 on April 18, 2020, 11:22:57 pm ---Would the voltage overshoot be acceptable with 100 milliohms for the CS resistor and 1A maximum load?

--- End quote ---
Are you asking the original poster or me?

I don't see the need for such a low value current sense resistor in a linear power supply such as this. 1V or so of additional voltage drop, at full load should be acceptable. Going for very low values will increase the error, from offset voltages, especially at lower currents.
xavier60:

--- Quote from: Zero999 on April 19, 2020, 09:51:18 am ---
--- Quote from: xavier60 on April 18, 2020, 11:22:57 pm ---Would the voltage overshoot be acceptable with 100 milliohms for the CS resistor and 1A maximum load?

--- End quote ---
Are you asking the original poster or me?

I don't see the need for such a low value current sense resistor in a linear power supply such as this. 1V or so of additional voltage drop, at full load should be acceptable. Going for very low values will increase the error, from offset voltages, especially at lower currents.

--- End quote ---
I was asking you since you already had it in a simulator. Maybe the voltage overshoot will be acceptable with an output capacitor added and faster compensation.
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