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Simplistic Mosfet HV Shunt Regs
Simplistic Mosfet HV Shunt Regs
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Old 13th October 2012, 01:50 PM   #3281
widi is offline widi  Spain
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Originally Posted by Salas View Post
Advise is you will need a transformer with two discrete same secondaries, i.e. 4 wires not 3 to make the two positive regs configuration. Milliamps and Volts is whatever your application specifies plus 20mA for the regs. Double that to be royal if you can. Keep in mind about AC*1.33 real DC value to expect after rectification. Make sure it will allow 20V headroom to the regulators.
Sorry for my equivocation,
Two transformers Hammond model 369AX, 40 Va Power and 250V and 115miliamperios SEC.
I was wrong with a transformer I have for other applications.

Best Regards.
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Old 13th October 2012, 02:12 PM   #3282
Salas is online now Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Those will give ~330VDC with solid state bridge rectification and loaded by the reg's CCS.
You should consider enough RC to drop about 100V @ CCS current consideration level before the regs for your +/-200V that I saw on your posted drawing.
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Old 13th October 2012, 02:24 PM   #3283
widi is offline widi  Spain
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Quote:
Originally Posted by Salas View Post
Those will give ~330VDC with solid state bridge rectification and loaded by the reg's CCS.
You should consider enough RC to drop about 100V @ CCS current consideration level before the regs for your +/-200V that I saw on your posted drawing.
True, but he could also use another model 363AX, that is 200V 115 Milliamp, and once past the bridge rectifier would give us about 280V.
This model would be more advisable?
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Old 13th October 2012, 02:40 PM   #3284
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Simplistic Mosfet HV Shunt Regs
More like 265V before RC, yes more advisable for less drop & heat, also smaller wattage R in the RC.
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Old 13th October 2012, 02:42 PM   #3285
Salas is online now Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Arrange for ~220VDC input to the regs all things considered.
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Old 13th October 2012, 11:00 PM   #3286
king4joy is offline king4joy  Hong Kong
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If you will test with the bleeder installed plus one 10K that will indicate 42mA capability at the voltage it will settle. If that will be 285V or more, remove both resistors, connect the reg and set it to 40mA. install a 150K 2W bleeder if you got or get one to install later where the 22K was for capacitor bank exposed legs to be HV safe after turn off.
I measured last night, with a 22K/50W parallel with one 10K/50W, the voltage across was 286V on start up; and went to 288V after 3-5 minutes (the 10K also gets a bit hot).

Next week, I will remove the 22K and the 10K, and connect to test the SSHV2....

Could you please explain how you can calculate and predict that when I remove one 10K from the dummy load I used before, that we will get 286V??

Cheers,

King
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Old 13th October 2012, 11:21 PM   #3287
Salas is online now Salas  Greece
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Simplistic Mosfet HV Shunt Regs
Ohm's law.
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Old 14th October 2012, 12:32 PM   #3288
king4joy is offline king4joy  Hong Kong
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Yes, I know....Ohm's law must be part of it.....but with Ohm's law, to calculate the V, you need to be given R and I.....given only R, how can you predict V and I??...what is the logic behind it???
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Old 14th October 2012, 12:36 PM   #3289
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Simplistic Mosfet HV Shunt Regs
You gave some ball park data in #3270.
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Old 14th October 2012, 12:48 PM   #3290
king4joy is offline king4joy  Hong Kong
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yes...my question should be: how could I use those ball park data to predict even a ball park figure for V and I given only R.....
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