Simplistic mosFET HV Shunt Regs

Jump to Latest
#2,362
Both gave their magic smoke up. They are fixed and working perfectly now. I will drop the current down a little later. I want to have room to experiments with bias points.

Merlin, I suspect that you LED's have too much voltage drop. I see in your photo's that you have new type LEDs like I tried. Had almost 8.5V drop accross three of them which made the sense resistor R1 heat up too much and burn out. Please measure them. You only need about 6V of drop.

And with you blowing the gate resistor your symptoms are exactly as mine with too big drop across the LED's.
 
#2,366
merlin el mago said:
1K 5.48V, thanks Gregory.
Click to expand...

Something beyond the circuit itself must be happening. Do something drastic. Get rid of the peripherals. Use a simple small transformer, bridge with 1000V piv diodes, one 100-150uf capacitor, short Vin wires, and feed. Simple grounding, use no crocodile clips. Maybe a transient discharge from the big PSU & filter hits whatever you try out now. Something that the CCS can't hold up to... Can't think of what for sure, this is baffling me, and is only hands on to really tell.
 
#2,368
SGregory said:
Salas, is spot on with his recomendation. With that current level much better using dual mono and big heat sinks. My SSHV regs live on these sinks. 1 reg per sink passing 70mA total current with 345V Input. 310V output. Load is 30mA.

The heatsinks stay comfortable warm but are warm non the less. ABout 45-50C in 28C room
Click to expand...

Isn't winter in the USA? Can you survive with 28C in the room?:flame:
 
#2,369
Salas said:
In that case, I would make another one the same reg for double mono both with 47R R1, because with your construction space and sinks, if you will crank the CCS to 70-75mA (extra to 50mA load is for the reg to work well) I don't see it will hold thermally well.
Click to expand...

Thanks Salas, I will wait for the GB and make 2 SSHV2 instead of built another SSHV1. Wish you and all DIYaudio members a happy new year.
 
#2,370
Salas said:
Something beyond the circuit itself must be happening. Do something drastic. Get rid of the peripherals. Use a simple small transformer, bridge with 1000V piv diodes, one 100-150uf capacitor, short Vin wires, and feed. Simple grounding, use no crocodile clips. Maybe a transient discharge from the big PSU & filter hits whatever you try out now. Something that the CCS can't hold up to... Can't think of what for sure, this is baffling me, and is only hands on to really tell.
Click to expand...

Salas said:
Those are good parts, but I am afraid this is not the real problem.
Click to expand...

OK I use with the ne P2P CCS a 150uF mains filter cap 4 x UF4007 diodes & the old tx to see what happens.
 
#2,372
Also burned 220R gate resistor & IRF9610 supplied by Mike😡

Vin reg 330V measured at the main filter cap
 

Attachments

  • DSC00051.jpg
    DSC00051.jpg
    478 KB · Views: 475
  • DSC00052.jpg
    DSC00052.jpg
    693 KB · Views: 452
  • DSC00053.jpg
    DSC00053.jpg
    555.6 KB · Views: 431
Last edited:
You must log in or register to reply here.
Top Bottom