Power supply cap multiplier with electronic protection

dadod · 29th January 2012, 10:23 AM

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

dadod · 30th January 2012, 10:09 AM

This is for +40 V only. For -40 V it is similar with complementary semiconductors.
No comments or suggestions??
dado

dadod · 11th February 2012, 11:10 AM

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

dadod · 22nd February 2012, 12:10 PM

No comments or suggestion to improve it??
Is it a total rubbish or so good that there is nothing to improve??
dado

LineSource · 8th April 2012, 12:49 AM

Hi dadod,

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

I am very interested, but also very lazy.

dadod · 8th April 2012, 04:53 PM

Quote:

Originally Posted by LineSource

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.

dadod · 11th April 2012, 07:57 AM

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

Ar4 · 15th April 2012, 06:38 PM

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.

dadod · 16th April 2012, 01:21 PM

Quote:

Originally Posted by Ar4

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

sawreyrw · 16th April 2012, 02:09 PM

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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30th January 2012, 10:09 AM	#2
dadod diyAudio Member Join Date: Apr 2006 Location: Zagreb	This is for +40 V only. For -40 V it is similar with complementary semiconductors. No comments or suggestions?? dado

22nd February 2012, 12:10 PM	#4
dadod diyAudio Member Join Date: Apr 2006 Location: Zagreb	No comments or suggestion to improve it?? Is it a total rubbish or so good that there is nothing to improve?? dado

8th April 2012, 12:49 AM	#5
LineSource diyAudio Member Join Date: Sep 2003 Location: SiliconValley	Hi dadod, Can you post the LTSPICE simulation files for these power supply regulators? I am very interested, but also very lazy.

11th April 2012, 07:57 AM	#7
dadod diyAudio Member Join Date: Apr 2006 Location: Zagreb	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

15th April 2012, 06:38 PM	#8
Ar4 diyAudio Member Join Date: Apr 2010 Location: Latvia	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.

16th April 2012, 02:09 PM	#10
sawreyrw diyAudio Member Join Date: Apr 2006 Location: Minnesota	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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