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Old 29th January 2012, 10:23 AM   #1
dadod is offline dadod  Croatia
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Default Power supply cap multiplier with electronic protection

I need a power supply for my TT amp ThermalTrak+TMC amp with following feature:
+-40 to 45V
up to +- 10A
electronic fuse triggered with delay depend on the current level (shorter for higher currents)
loudspeaker electronic protection

Here is the circuit I simulated, not finished as a loudspeaker protection is not incorporated yet.
Any suggestion welcome.
dado
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File Type: jpg Power-Cmp.sch.jpg (115.2 KB, 1460 views)
File Type: jpg Power-Cmp.sim.jpg (152.9 KB, 1382 views)
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Old 30th January 2012, 10:09 AM   #2
dadod is offline dadod  Croatia
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This is for +40 V only. For -40 V it is similar with complementary semiconductors.
No comments or suggestions??
dado
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Old 11th February 2012, 11:10 AM   #3
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Here is my final schematic for +-45 to +-50V and cca 11A short circuit protection.
There is a loudspeaker protection from DC voltage also, in case the amplifier failure.
The current protection monitor the currents in both sides and if one side tripe the electronic fuse, other side will switch off too. Similarly the loudspeaker protection will work, if one side is triped the other side is triped too.
Current protection has a time delay from 20msec to 400msec depends of the current level.
Simulations attached show it from 12A to 14A.
Up to now there was no interest and comments here.
dado
Attached Images
File Type: jpg PowerSupply.sch.jpg (142.6 KB, 1261 views)
File Type: jpg CurrentProtection-12A.jpg (173.7 KB, 1187 views)
File Type: jpg CurrentProtection-13A.jpg (176.7 KB, 1022 views)
File Type: jpg CurrentProtection-14A.jpg (130.6 KB, 211 views)
File Type: jpg LoudspeakerProtection.jpg (174.9 KB, 287 views)
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Old 22nd February 2012, 12:10 PM   #4
dadod is offline dadod  Croatia
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No comments or suggestion to improve it??
Is it a total rubbish or so good that there is nothing to improve??
dado
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Old 8th April 2012, 12:49 AM   #5
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Hi dadod,

Can you post the LTSPICE simulation files for these power supply regulators?

I am very interested, but also very lazy.
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Old 8th April 2012, 04:53 PM   #6
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Quote:
Originally Posted by LineSource View Post
Hi dadod,

Can you post the LTSPICE simulation files for these power supply regulators?

I am very interested, but also very lazy.
OK it is here, if you need explanation how I simulated it, ask.
Attached Files
File Type: zip PSregulator.zip (18.3 KB, 129 views)
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Old 11th April 2012, 07:57 AM   #7
dadod is offline dadod  Croatia
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LineSource, did you do any simulation, what do you think of the regulator??
This regulator (BJT type) is used in my TT amp and works as intended.
dado
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Old 15th April 2012, 06:38 PM   #8
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Looks really good. I am using superb simple, mosfet based, capacitance multiplier, and it really is profitable device for class A / AB amps. I used simple RCRCR combination for mosfet's gate, and that also adds feature similar to soft start.
Build it, and tell us, how does it work in real life circuit.
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Old 16th April 2012, 01:21 PM   #9
dadod is offline dadod  Croatia
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Quote:
Originally Posted by Ar4 View Post
Looks really good. I am using superb simple, mosfet based, capacitance multiplier, and it really is profitable device for class A / AB amps. I used simple RCRCR combination for mosfet's gate, and that also adds feature similar to soft start.
Build it, and tell us, how does it work in real life circuit.
It was built and used with real amp, look here: ThermalTrak+TMC amp
dado
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Old 16th April 2012, 02:09 PM   #10
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I don't think the overload and short circuit will be fast enough to protect the supply. Also, I doubt the pass transistors can handle 10 amps without overheating. I could be wrong; have you done a worst case thermal analysis? I don't see any voltage reference in the schematic. How do you think this will regulate if the input line voltage changes?
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