Author Topic: Turning SSTC into DRSSTC  (Read 425 times)

Offline Simranjit

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Turning SSTC into DRSSTC
« on: June 12, 2024, 10:23:08 PM »
Hi, I finally built my ramped SSTC (using esp32 as interrupter) which uses mains ac for ramp. Using half bridge configuration I was able to get around 7.5inch sparks at 30% duty cycle. My question is that if I add capacitor to primary this will indeed turn into DRSSTC. But now according to LabCoatz:
This is where the flip-flop comes into play: essentially, it prevents the interrupter from shutting off your transistors while current is flowing, which could kill them if you’re running in dual resonance.
I also looked at truth table of flip-flop 74HC74N. So according to my understanding we have to turn off interrupter at the next rising edge of clock/feedback. Is that correct, please help me clear it up a bit more. Also wouldn't it be better to turn off interrupter when signal is low instead of waiting for next rising edge?
« Last Edit: June 12, 2024, 10:28:41 PM by Simranjit »

Offline flyingperson23

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Re: Turning SSTC into DRSSTC
« Reply #1 on: June 12, 2024, 11:04:57 PM »
Especially for DRSSTCs where we can be switching 4x the rated max current or more, it's important to maintain zero current switching. The interrupter doesn't have any constraints for when it turns on/off, so almost definitely it will turn off when the primary current isn't zero. The interrupter signal feeds into the flip flop so that when the interrupter turns off, the flip flop waits until the next rising edge of the feedback to turn off the coil. This means the coil itself is guaranteed to turn off only when the primary current is zero.

Offline Simranjit

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Re: Turning SSTC into DRSSTC
« Reply #2 on: June 13, 2024, 02:14:17 AM »
Especially for DRSSTCs where we can be switching 4x the rated max current or more, it's important to maintain zero current switching. The interrupter doesn't have any constraints for when it turns on/off, so almost definitely it will turn off when the primary current isn't zero. The interrupter signal feeds into the flip flop so that when the interrupter turns off, the flip flop waits until the next rising edge of the feedback to turn off the coil. This means the coil itself is guaranteed to turn off only when the primary current is zero.

Thank you very much for the clear explanation.

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Re: Turning SSTC into DRSSTC
« Reply #2 on: June 13, 2024, 02:14:17 AM »

 


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