Author Topic: Bus Supply Questions  (Read 315 times)

Offline flyingperson23

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Bus Supply Questions
« on: January 04, 2022, 04:12:34 AM »
 Hey, I built a vttc and I'm looking to try and build a drsstc, but I'm a bit of a noob. Out of the designs I've seen online, namely by kaiser and loneocean, I've seen two different general designs: half bridge with voltage doubler rectifier, and full bridge with standard rectifier. Are the two mutually exclusive? What are their benefits? I live in the US with access to 240vac and I'd like to build something similar in size and power to loneoceans' drsstc 2/3, probably with cm300's. Should I do a full bridge with 340v as the bus voltage or half bridge with 678v?
Thanks!

Offline AstRii

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Re: Bus Supply Questions
« Reply #1 on: January 04, 2022, 01:37:02 PM »
I dont think there are any advantages of using half bridge with voltage doubler, to be honest I've never seen voltage doublers when using 240VAC input. Voltage doublers are usually used in US countries where mains voltage is only 120VAC to step it up higher.

Half bridge designs are usually used in lower power applications as they deliver only 1/4 of the power of a full bridge (assuming the same conditions in both cases). For smaller DRSSTCs half bridge configuration is usually easier to build and also cheaper to repair as only 2 IGBTs blow up instead of 4.

Using half bridge with voltage doubler when working with 240VAC seems contraproductive to me. If you have 340VDC bus available there is no need for voltage doubler unless you want to run very high DC bus voltages.

If you are a begginer, I would suggest to always work with lower voltages, not just for safety reasons but also because it's easier to work with.
Marek Novotny
Czech Republic, Czech Technical University in Prague
www.uhvlab.org

Offline Hydron

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Re: Bus Supply Questions
« Reply #2 on: January 04, 2022, 05:58:10 PM »
Full bridge + 240VAC + voltage doubler is a pretty standard configuration for mid-large size coils with 1200V IGBTs. Most CM300s used in coils will likely be the 1200V version (part number CM300-24x, where x is the variant, 24 is the voltage rating divided by 50 = 1200V for some obscure reason, and 300 = an indication of the nominal hard current switching class).

The specs of loneoceanĀ“s DRSSTC 3 are pretty similar to my larger coil, and both he and I use a voltage doubler + full bridge running off 240VAC. I have tried running mine off non-doubled mains in the past and got reasonable results but I definitely prefer the doubled version.

The only reason that I'd do anything different is if I had a smaller coil which didn't benefit from extra bus voltage, or was very budget constrained (in which case you could save on bus capacitors and 1200V silicon by going for non-doubled mains and using 600V IGBTs, or save on IGBTs by going for a half bridge but doubled).

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Re: Bus Supply Questions
« Reply #2 on: January 04, 2022, 05:58:10 PM »

 


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