Author Topic: Small DRSSTC  (Read 673 times)

Offline Bambinz

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Small DRSSTC
« on: April 28, 2020, 04:08:50 PM »
Hi all,
I would like to realize a little DRSSTC, the idea is to obtain longer spark from the SSTC that I have developed in the post in SSTC section.

I have two secondari coil: one with a resonance frequency arround 1MHz and the other probably in the range of 400kHz, but I can measure precisely the resonant frequency of the coil with the Analog Discovery 2.

I will supply the coil with a 30VAC 150VA transformer or 50VAC 500VA transformer that I have.

I am thinking a full bridge with IXFP76N15T2 mosfet.

The idea is to have the simplest possible drivers, now I am drawing the schematics.

A questions, I should use primari o secondary feedback or antenna feedback? The overcurrent detector is mandatory or not?

Thank you very much in advance for your time and help!




Offline ritaismyconscience

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Re: Small DRSSTC
« Reply #1 on: April 28, 2020, 06:36:05 PM »

A questions, I should use primari o secondary feedback or antenna feedback? The overcurrent detector is mandatory or not?


Primary feedback is usually used because the resonant frequency for both are the same. Theoretically, you could get away with not having OCP, especially when you're running it at low voltage, as the current might not be able to ramp up fast enough, but it's still recommended (most drivers have OCP already too).

Offline Bambinz

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Re: Small DRSSTC
« Reply #2 on: April 28, 2020, 08:36:19 PM »
Ok, thank you very much!

But I don't understand why is usualy used primary feedback.
I think that the resonance frequency of the secondary will change during the spark, therefore if I use the secondary feedback will be always in resonance. No?

Offline fnordest

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Re: Small DRSSTC
« Reply #3 on: April 29, 2020, 09:38:08 AM »
It is more important to keep the inverter in resonance with the primary circuit. Having primary feedback with phaselead enables close to zero-current switching. ZCS is absolutely vital to high power DRSSTCs. Switching losses are minimal and we can switch up to 5 times faster than the IGBTs are rated for.

The arc-detuning is met with primary detuning. So when the spark grows it pulls the system closer to resonance.

Hope this helps a little bit

Offline Bambinz

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Re: Small DRSSTC
« Reply #4 on: April 29, 2020, 11:14:06 AM »
Thank you very much!
I try to implement all and then I will post the schematics!

Offline Bambinz

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Re: Small DRSSTC
« Reply #5 on: April 29, 2020, 08:15:16 PM »
Hi all,

I would like to base the driver on the Steven Ward 1.3b.
A little questions, in my case where I use a normal mosfet and not mosfet module/IGBT,is it necessary the STB16PF06 push-pull?

Thank you very much!
Best regards
Alessandro Vaghi

Offline fnordest

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Re: Small DRSSTC
« Reply #6 on: April 29, 2020, 11:08:16 PM »
A lot of work has been done on steves original driver design since 1.3b.

Check out loneoceans UD2.7c . It's the most common driver and is used in all kinds of DRSSTCs. Extensively tested and a good documentation. http://loneoceans.com/labs/ud27/

UD+ from philslab adds freewheeling and a few more tweaking options. http://classictesla.com/pslawinski/udplus.html

Another advanced iteration is the simpleDriver with phaseshifted switching for QCW http://simpletesla.ru/en/shop/simpledriver2en/

and then Netzpfuschers UD3 pushing it to the next level with an PSoC based driver. https://highvoltageforum.net/index.php?topic=188.40


Offline Bambinz

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Re: Small DRSSTC
« Reply #7 on: May 09, 2020, 10:26:26 AM »
Hii,
I have finished the schematics. What do you think? Can work?

Thank you very much!

High Voltage Forum

Re: Small DRSSTC
« Reply #7 on: May 09, 2020, 10:26:26 AM »

 


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