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Old 20th April 2008, 10:40 AM   #1
panos29 is offline panos29  Greece
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Default Indestructible HV hybrid regulator!

After months of experimenting and trial and error I finally managed to arrive at a working prototype of a hybrid regulator. It is based on a new HV opamp made by texas, OPA454. The prototype is capable of 1 A, yes 1A at 220V with less than 1,5mV ripple fully loaded (resistive load), which is more like random noise on my scope.

One problem I noticed is that when the speed-up capacitor (470n) is out of the circuit the power suplly is unstable producing a steady 5-6KHz oscillation.

Otherwise the circuit is very stable and there is no measurable drop in output voltage from no load to full load.

Another problem I noticed when used this is powering a 6W SE tube amplifier at 238V/200ma at full output power, is that the AC component on the power rails, when sweeping from 5Hz to 20KHz is not uniform, but changes from 1mV@5Hz-1Khz to 30mV@20KHz.
Is this non uniform responce acceptable, or the regulator is suffering some kind of problem?
If this is a problem, is there anyway I can fix this?

Any comments or suggestions are very more than welcome.
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Old 20th April 2008, 11:37 AM   #2
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How long did you test it at 220v and 1A? It looks like to me that
you would be droping about 140v across that 6c33c. At one A that
would be 140w and the tube is only rated at 560ma and 60w!
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Old 20th April 2008, 02:07 PM   #3
panos29 is offline panos29  Greece
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Default Correct

Very correct, I only did that test for less than 20 seconds to see the limits of the circuit. However, the tube did not get red duing the test period, its anode is massive tiatanium made and it is very hard to get it to glow. It is an amazingly tough tube that can take alot of abuse! I even tried a direct short, 3 times, in order to test if it is shortcircuit-proof (the bang was spectacular!).
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