Author Topic: First SSTC based on profdc9 PCB Pack  (Read 560 times)

Offline SK1701

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First SSTC based on profdc9 PCB Pack
« on: January 05, 2022, 08:37:13 PM »
Hey guys.

After years of wanting to build an SSTC, I've started work on my first build. I am using the schematics kindly provided by profdc9 (https://github.com/profdc9/DRSSTC-PCB-Pack) for the driver and full bridge (with FGH60N60SMD). I had the PCBs fabricated at JLCPCB and I have started assembling them now. I thought I would make this thread to ask questions as well as document my progress. I had a couple questions to start off with:
  • This driver doesn't seem to have any sort of interrupter built in. Does this mean the coil will be operating in CW mode the whole time and so won't heat/ power be a concern?
  • I typically see ~30 AWG wire used for the secondary. The most readily available source here is 1/2 lb spools of 29 AWG. Would this still work, i was planning a secondary diameter of ~4 inche PVC pipe?
  • I am using the following bus capacitor - https://lcsc.com/product-detail/Aluminum-Electrolytic-Capacitors-Can-Screw-Terminals_Zeasset-TAG102M51080LVA_C432125.html with aa 100k 20 W bleeder resistor. How much of a concern is inrush current, and could you recommend appropriate NTC thermistors for current limiting? Would using a variac remove the need for inrush limiting?

Cheers!

Offline alan sailer

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Re: First SSTC based on profdc9 PCB Pack
« Reply #1 on: January 06, 2022, 12:18:38 AM »
SK,

The profdc9 github package also has two boards for two types of interrupter normal and line interrupter. It couples to the UD board using optical fiber.

JavaTC will give the total wire length your proposed secondary will need. If the 1/2 lb spool has that amount of wire you are good. The wire length depends on
both the diameter and the length of the secondary.

The inrush current is a concern. I am not directly familiar with the NTC as an inrush current limiter. A Variac (and the discipline to always turn the Variac to zero after each run!)
will eliminate the need for inrush limiting. The capacitors will charge much faster than any rotation of the variac dial.

Cheers.

Offline SK1701

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Re: First SSTC based on profdc9 PCB Pack
« Reply #2 on: January 06, 2022, 03:05:55 PM »
Thanks Alan!

I assumed his interrupter designs were for the UD board. This driver isn't the UD (which as I understood is for DRSSTCs). It is the regular SSTC driver posted here - https://github.com/profdc9/DRSSTC-PCB-Pack/tree/master/half-bridge-sstc There is no fiber optic input for an interrupter and the enable pins of the gate driver chips are left floating

Offline alan sailer

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Re: First SSTC based on profdc9 PCB Pack
« Reply #3 on: January 06, 2022, 06:09:39 PM »
Sorry about overlooking the SSTC/DRSSTC distinction.

I have not built an SSTC like the design shown so I can't help. Hopefully a better experienced builder will help.

Cheers.

Offline davekni

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Re: First SSTC based on profdc9 PCB Pack
« Reply #4 on: January 07, 2022, 05:15:38 AM »
Quote
This driver doesn't seem to have any sort of interrupter built in. Does this mean the coil will be operating in CW mode the whole time and so won't heat/ power be a concern?
The schematic you posted does include an optical isolator, disabling operation when the isolator LED is energized.  You could use that for interruption.  I don't see any other interrupter functionality.  Continuous operation can be fine.  That is the way my SSTC runs.  Behavior is somewhat different relative to interrupted operation.
https://highvoltageforum.net/index.php?topic=1021.msg7119#msg7119

Quote
How much of a concern is inrush current, and could you recommend appropriate NTC thermistors for current limiting? Would using a variac remove the need for inrush limiting?
Either works.  Two NTC specification parameters are most important:  First is energy capability.  NTC must be rated to handle the energy stored in your bulk capacitor.  Look for units of Joules.  Second is continuous current (RMS amps).  Necessary rating depends on the power your coil will draw during operation.  Somewhat less important specification is cold (nominal) resistance.  That determines what the initial inrush current will be.  Building power circuits are designed to handle inrush of incandescent light bulbs and motors, often 10x rated continuous current.  Finally, most NTC inrush limiting designs use a relay to bypass (short across) the NTC a few seconds after power-up.  For home projects I often skip this, but NTC reliability isn't great when used continuously near rated current.
David Knierim

High Voltage Forum

Re: First SSTC based on profdc9 PCB Pack
« Reply #4 on: January 07, 2022, 05:15:38 AM »

 


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