Hi Salas, I would like to try your shunt to feed the two mono Aikido PCBs, a CLC filtering system with SS straightening could be right for me? Would I benefit by using Tube rectification? Thank you for your precious answers
Set the SSHV2 for 50mA CCS and configure at the output connector two wire mode* as it will be a common reg between two channels the Kelvin mode would not help much anyway. CLC and SS bridge are fine. Use 0.1uF to 1uF decoupling film cap across the regulator's input connector if there will be significant wiring length coming from the CLC. Good luck and let us know.
*What is two wire mode
*What is two wire mode
Hi Salas, after weeks of using the regulator without any stability problem, this evening the output voltage just started to fluctuate. Now it has aground 10 V peak to peak fluctuation at the output, the output is set at 270V. I have checked the FET and PNP transistors and they all seem ok.
CCS is working fine (I can very the constant current from the pot). Diode D3 is ok also.
Can it be the IRF840?
Is it ok that I have a common heat sink for both DN2540 and IRF840? Does it go into thermal disequilibrium?
Silviu
CCS is working fine (I can very the constant current from the pot). Diode D3 is ok also.
Can it be the IRF840?
Is it ok that I have a common heat sink for both DN2540 and IRF840? Does it go into thermal disequilibrium?
Silviu
It can be the 840 if it was working under much heat. About common sink if the MOSFETS are well insulated and the heat is not excessive it should be alright. I mean if it is a build's basic configuration problem and not a part's failure it wouldn't work well for weeks in the first place.
Thank you Salas,
The temperature gets a bit hot... I’ll use a bigger heatsink and change IRF840.
Regards,
Silviu
The temperature gets a bit hot... I’ll use a bigger heatsink and change IRF840.
Regards,
Silviu
Did you check its insulation to the sink has not gone conductive or measured if it shows few Volts Vgs or not? If not, its certainly broken.
I checked it and it’s ok. One thing that I forgot to mention... I don’t have any thermal paste in there. That might help a lot to reach thermal runaway. I’ll try to find some paste today in the computer shops around Dublin.
Thank you Salas for your wonderful design and fast replies
Thank you Salas for your wonderful design and fast replies
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Better use the scope (with short ground probe tip attachment) to see what that AC indication is about in that installation. EMI/RFI on non-shielded probe wires? Instability? Hum?
Probe X10 to have bandwidth. Vertical set at the most sensitive, horizontal just go up and down to find something or not, but 0.2mS is a good starting point for wide view.
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Shows four squares period = 20mS = 50Hz = hum (can be groundloop or transformer field or whatever, PSU ripple its not as it would be 100Hz, review the build's arrangement, wiring scheme, and wires dressing)