I need a power supply for my TT amp http://www.diyaudio.com/forums/solid-state/182554-thermaltrak-tmc-amp-5.html#post2856542 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
+-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
Attachments
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
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
Attachments
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.
Attachments
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.
Build it, and tell us, how does it work in real life circuit.
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: http://www.diyaudio.com/forums/solid-state/182554-thermaltrak-tmc-amp-7.html#post2964648
dado
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?
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?
Here is simulation at cca 10 A of the load current. There is about 5 V of the voltage drop on the regulation transistor and with 10 A it gives 50 W. Look here for SOA http://www.onsemi.com/pub_link/Collateral/MJL4281A-D.PDF
This is not a stabilizator but regulator or some kind of a capacitor multiplier. It will follow slow input voltage changes, but regulate a fast ones.
dado
Attachments
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
LineSource, I was expecting to get some information from you but nothing, it's not nice that. Have you done your simulation and what is your opinion?
dado
dadod, just saw your thread linked from other one - late, as usual!
What does all the circuitry around Q6,7,8 &9 actually do, including the zeners D7,8,9 on the +ve rail (similar to -ve rail) - if this can be either simplifier/left off, it's a much simpler cct and I might try it out.
... james
What does all the circuitry around Q6,7,8 &9 actually do, including the zeners D7,8,9 on the +ve rail (similar to -ve rail) - if this can be either simplifier/left off, it's a much simpler cct and I might try it out.
... james
dadod, just saw your thread linked from other one - late, as usual!
What does all the circuitry around Q6,7,8 &9 actually do, including the zeners D7,8,9 on the +ve rail (similar to -ve rail) - if this can be either simplifier/left off, it's a much simpler cct and I might try it out.
... james
Q7 and Q8 act as “thyristor” circuit, they are normally off, but if an input voltage is applied to Q8, even briefly, it will conduct and feed current into the base of Q7. This will make Q1 conduct, which in turn, will feed current into Q2, which holds the circuit on, or latched.
Q9 is the loudspeaker protection sensing element, and the zeners define that what difference in supply lines are acceptable, in this case if differente is more then 20 V it will trigger protection and cat the power. This will happen if one of the supplies is cut off, and it will then turn the other line off as well.
dado
Last PCB layout is here. http://www.diyaudio.com/forums/solid-state/182554-thermaltrak-tmc-amp-18.html#post3187479
Also does the Naim supply regulator.http://www.acoustica.org.uk/t/naim/poweramp_pix/nap reg schema.pdfQ7 and Q8 act as “thyristor” circuit...
Also does the Naim supply regulator.http://www.acoustica.org.uk/t/naim/poweramp_pix/nap reg schema.pdf
Thanks for information, I didn't know that
Is post1 schematic the current version, or is it superseded by post 15?
Actually I made an improved version and I use it now with my TT amp. If you are interested I can show it in my TT amp tread with new layout.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Amplifiers
- Power Supplies
- Power supply cap multiplier with electronic protection