Author Topic: SSTC bus inductance  (Read 946 times)

Offline Benjamin Lockhart

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SSTC bus inductance
« on: February 02, 2024, 08:34:56 AM »
Is it super important to have a low inductance bus for a single resonant SSTC like it is for a DRSSTC?
I'm converting my mains ramped full bridge SSTC to fiber optic input to fix interference problems with the staccato controller, and I'd also like to have switchable bus caps (arranged as a doubler) so music can sound good but take them out of circuit for ramped mode.

The FGA60N65SMD bridge has a 0.68u film cap soldered to copper planes already, and I can get a switch pretty close but it might add 2 inches of wire length in the loop to the lytic caps. Is this a problem?

Thanks, Benjamin
« Last Edit: February 02, 2024, 08:37:38 AM by Benjamin Lockhart »

Offline davekni

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Re: SSTC bus inductance
« Reply #1 on: February 03, 2024, 06:01:12 AM »
Quote
Is it super important to have a low inductance bus for a single resonant SSTC like it is for a DRSSTC?
Inductance from IGBTs to snubber cap(s) is still important.  Inductance from snubber to bulk caps is less important because peak current is much lower.

Quote
The FGA60N65SMD bridge has a 0.68u film cap soldered to copper planes already, and I can get a switch pretty close but it might add 2 inches of wire length in the loop to the lytic caps. Is this a problem?
That wire inductance combined with snubber capacitance makes a resonant circuit.  There have been a few DRSSTC builds where that resonance happened to hit 2x operating frequency, causing high amplitude ring on Vbus.  Lower current of SSTC will help.  I'd scope Vbus at bridge to check just in case you have bad luck and hit 2x operating frequency.
David Knierim

Offline flyingperson23

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Re: SSTC bus inductance
« Reply #2 on: February 03, 2024, 08:04:29 AM »
How important really is the inductance? Assuming a few dozen uF of snubbers and good zcs, how bad would the layout actually have to be to cause problems?

Also related, I have a 560uF dc link capacitor with self inductance at most 3-5x that of a brick mount snubber. With that much capacitance, are dedicated snubbers even necessary?

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Re: SSTC bus inductance
« Reply #2 on: February 03, 2024, 08:04:29 AM »

 


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