Simplistic Mosfet HV Shunt Regs - Page 228 - diyAudio
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Old 29th December 2011, 06:20 PM   #2271
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Quote:
Originally Posted by Salas View Post
Merlin see what's wrong feeding, grounding, or loading the regs. Something's fishy when two different ones give smoke.
There is other way to test the Vin 284VDC than a DVM?, because with multimeter seems voltage OK.
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Old 29th December 2011, 06:26 PM   #2272
vgeorge is offline vgeorge  Greece
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1% resistor is not necessary for dummy.
Better transformers, sometimes have better regulation, so more Vin under load. I would put a resistor in front, say 500R on next try, just to be safe and check Vin and not to have too much drop on the shunt, and not to burn anything.
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Old 29th December 2011, 06:31 PM   #2273
AndrewT is offline AndrewT  Scotland
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A shunt regulator is safe without a dummy load.
The CCS half supplies constant current. Other than slight variations with temperature changes, you can never get more current through the CCS.

The Shunt then draws current. If the current from the CCS exceeds the load current and the shunt current then the output rises. The shunt adjusts and when the shunt current + the load current = CCS current the shunt is regulating the output voltage.
If the load current drops to zero the output voltage rises and the Shunt adjusts to draw more current and the voltage drops back to the regulated voltage.
If the CCS + Shunt cannot survive an open circuit output then the components have been chosen badly.

A CCS + Shunt regulator is virtually bombproof. Nothing outside the regulator can ever damage a properly built shunt regulator.
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Old 29th December 2011, 06:35 PM   #2274
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Yes I know is'nt necessary 1% resistor as dummy load but I have on my stash so I will use instead to buy a new one. 500R instead 47R or in series with B+?

Tx
rendering 90%
regulation 0.5%
Ampere 0.505 for 220 - RDC Ohms 11
primary RDC ohms 11
relation primary 230 / secondary 220 = n. 1,0455
relation n 1,0455 to the square 1,093

primary RDC ohms 11
relation n. to the square 1,093
source resistance 20 ohms
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Old 29th December 2011, 06:43 PM   #2275
vgeorge is offline vgeorge  Greece
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500R in series with B+. If Vin is too low, nothing gets burned, just can' t regulate. Then you can lower this resistor to reach desired Vin.
Of course, you can simulate all this with PSUD2. Then you will now before you try!
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Old 29th December 2011, 06:56 PM   #2276
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The other tx used before was 240VAC, now the new Bartolucci only have 200VAC, really I don't understand nothing & I don't know the reason of issue, there is other way to test Vin 284V coming from the PSU that isn't a DVM?
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Old 29th December 2011, 07:38 PM   #2277
vgeorge is offline vgeorge  Greece
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284V is unloaded. Actual B+ would be smaller.
Try to learn this program : PSUD2
(I think I said this many times today)
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Old 29th December 2011, 08:19 PM   #2278
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Sorry my ignorance wich value to simulate "for value in ms" and for "after a reporting delay of value in S"?

Using 1000 for value in ms and 1 for value in S the voltage after the reg is 285V I do something wrong?

Last edited by merlin el mago; 29th December 2011 at 08:28 PM.
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Old 29th December 2011, 08:44 PM   #2279
Salas is offline Salas  Greece
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Watch it with high voltage when debugging, keep one hand in your back pocket. Certainly watch out for gross stuff like accidentally shorting an HV line and the like. Better wear eye protection.
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Old 30th December 2011, 04:52 AM   #2280
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
I have CLC, tx is Bartolucci 200VDC choke is Bartolucci 10H 100mA, all caps are lytics C1 660uF 450V & C2 300uF 350V
Can the capacitors be too heavy kicking high spikes?
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