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Non-linear CV/CC control in schematic

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Silver_Pharaoh:

--- Quote from: xavier60 on March 07, 2019, 11:17:41 pm ---That looks right except for R11 which is label as "1" but must really be 100Ω because 1Ω would result in a very high maximum setting like 100A!

--- End quote ---

At 100 \$\Omega\$ max current seems to be around 12.8A?

Unless this is a quirk of LTSpice?

xavier60:

--- Quote from: Silver_Pharaoh on March 08, 2019, 12:33:11 am ---
--- Quote from: xavier60 on March 07, 2019, 11:17:41 pm ---That looks right except for R11 which is label as "1" but must really be 100Ω because 1Ω would result in a very high maximum setting like 100A!

--- End quote ---

At 100 \$\Omega\$ max current seems to be around 12.8A?

Unless this is a quirk of LTSpice?

--- End quote ---
That could be right. In situations that use a transistor'a Base to Emitter threshold voltage as a reference, some try and see needs to be done.
Also, the short circuited current setting will have to be a fair bit higher than the expected normal current draw to avoid voltage droop.

Silver_Pharaoh:

--- Quote from: xavier60 on March 08, 2019, 12:43:13 am ---
--- Quote from: Silver_Pharaoh on March 08, 2019, 12:33:11 am ---
--- Quote from: xavier60 on March 07, 2019, 11:17:41 pm ---That looks right except for R11 which is label as "1" but must really be 100Ω because 1Ω would result in a very high maximum setting like 100A!

--- End quote ---

At 100 \$\Omega\$ max current seems to be around 12.8A?

Unless this is a quirk of LTSpice?

--- End quote ---
That could be right. In situations that use a transistor'a Base to Emitter threshold voltage as a reference, some try and see needs to be done.
Also, the short circuited current setting will have to be a fair bit higher that the expected normal current draw to avoid voltage droop.

--- End quote ---

Make sense, otherwise the CL transistor would start to reduce the voltage as it conducts more and more right?

xavier60:
As the Base to Emitter voltage increases with increasing output current, the CL transistor starts turning on gradually at first. This is what would be causing the voltage droop.

Silver_Pharaoh:
Well I think this is the final version!
All seems to work well.

I included 2 other versions with a more linear & tighter voltage adjustment.

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