Simplistic MosFET HV Shunt Regs

[merlin el mago]

I don't have more KSA1381 or 2SA1381 or SA1381, could I use MJE350?

 

[Salas]

Yes.

 

[merlin el mago]

Thanks, this is what has happened to dn2450 heatsinked

 

[merlin el mago]

Have I to connect the MJE350 reversed because don't share the same pin configuration like KSA1381?

 

[Salas]

They are both ecb. What your Atlas say, are the KSA dead or not?

 

[Salas]

Thanks, this is what has happened to dn2450 heatsinked

That is from when the Caddock broke too?

 

[merlin el mago]

They are both ecb. What your Atlas say, are the KSA dead or not?

My Atlas is broken, needs to send back to the manufacturer to repair.

 

[Salas]

Jinx!

 

[merlin el mago]

That is from when the Caddock broke too?

No, later other test with fuses installed and fuses broken also.

 

[merlin el mago]

I install the MJE350

 

[Salas]

No, later other test with fuses installed and fuses broken also.

Looks like shorting somehow. Was it still on doubler or normal rectification?

 

[merlin el mago]

Goes up till 137Vout when suddenly 1st fuse broken.

 

[merlin el mago]

Looks like shorting somehow. Was it still on doubler or normal rectification?

Tx 240VAC not doubler, normal rectification.

 

[Salas]

Are there photos and a schematic of the total configuration in blocks? From mains to load?

 

[merlin el mago]

All zeners are gone, replaced them and tested again the reg., now only crossed D2 so I will replace it and also replace Q2 DN2450.

 

[merlin el mago]

Crossed again D2, now I will replace all CCS.

 

[Stixx]

Something must be fundamentally wrong when resistors catch fire, parts burn out repeatedly and literally explode...
Being a beta tester of the SSHV I must say that building was very straightforward and easy, so I really wonder....

 

[merlin el mago]

Fixed the issue was where I suspected at the CCS the track between the two DN2450 was breaked, now I adjust the current to 30mA but the maximum Vout is 151,3VDC, the dummy load is 15K my Vout target is 280VDC Vin is 312,8VDC

 

[merlin el mago]

Red LED lits.

 

[merlin el mago]

MJE350 Q4 Emiter Collector soldered togheter

Now works like a charm