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Registered Member #1200
Joined: Mon Dec 31 2007, 01:43PM
Location: Kaohsiung, Taiwan
Posts: 27
Hi everyone, this is my first post. I am working on my first SSTC after some success with my SGTC. I am trying to copy Steve's Mini SSTC. The problem is that I only have UCC37322(I got 10pcs from Father's company).
My question is : Is it OK to replace UCC37321 with UCC37322 and invert the signal before going into IC?(So this makes a inverting driving signal compared to the other UCC37322.)
This is my finished secondary.(Sorry for picture's quality) Form diameter: 11.5mm Wire Diameter: 0.234mm Number of turns: 1050turns Coated with 4 layers of vinyl adhesive
Registered Member #33
Joined: Sat Feb 04 2006, 01:31PM
Location: Norway
Posts: 971
He's using the Mini SSTC design, not the Micro SSTC design. It's a halfbridge based design, and it uses one inverting and one noninverting gate driver.
Yes, you can just invert the signal before it goes into one of the gate drivers. Just use one of the spare 74HC14 gates for this.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Mini SSTC is 2 drivers, as far as I know, but inverting the input should do OK.
I don't know what mains voltage you have, but if it's 230V and 500V mosfets make sure to increase number of primary turns to fair level, 15...20 for start.
Are you really a first asian guy who joined here? At least in a while... Welcome to the forum sir!
Registered Member #1200
Joined: Mon Dec 31 2007, 01:43PM
Location: Kaohsiung, Taiwan
Posts: 27
Thanks you guys' reply.
@Anders M. Thanks, I nearly forgot there is already a 74hc14. No another inverter chip needed.
@Marko Well, we both use 110v and 220v. 220v often for microwave oven and air conditioner 110v for most devices.
Not sure if I'm the first Asian guy. But I am quite sure I am the first one in my country. Actually, I never seen any TC built by people in my counter. Either on the net or in real world.
Registered Member #1200
Joined: Mon Dec 31 2007, 01:43PM
Location: Kaohsiung, Taiwan
Posts: 27
Well, I got a ferrite core from a dead SMPS with mounting base. It looks just pretty and excellent. I think I will use it to make my GDT.
My finished halfbridge(IRFP460 not soldiered yet) and power block.(The PCB is modified from a fullbridge posted by EDY19 long time ago) The two black stuffs on the bridge are MUR860s.
Also I got a stainless steel sphere for free from a scrap yard. 2 inches in radius. The capacitance is 4.27 micro Farad.(Measured by my LCR meter)
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Well, I got a ferrite core from a dead SMPS with mounting base. It looks just pretty and excellent. I think I will use it to make my GDT.
That is a bad core for GDT (yellow-white powdered iron, material #26, low permeability)....
You need to get a real ferrite core, grey, #77, F or similar. Surely you can keep the base if another toroid fits...
Apart from that, it looks good.
I'm only not sure why Steve didn't put in reverse-blocking schottky diodes, as this way the MUR's may not conduct at all while body diodes will hog. I don't know why didn't he bring attention to that.
Registered Member #1200
Joined: Mon Dec 31 2007, 01:43PM
Location: Kaohsiung, Taiwan
Posts: 27
You need to get a real ferrite core, grey, #77, F or similar. Surely you can keep the base if another toroid fits...
It seems not easy to get ferrite core in my country. However I'll keep finding. I searched for the material list, looks like #26 is used in EMI filter. I know I need one with higher initial permeability.
I'm only not sure why Steve didn't put in reverse-blocking schottky diodes, as this way the MUR's may not conduct at all while body diodes will hog. I don't know why didn't he bring attention to that.
I'm not sure either. But I've seen a topic about the issue on pupman.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
It seems not easy to get ferrite core in my country. However I'll keep finding. I searched for the material list, looks like #26 is used in EMI filter. I know I need one with higher initial permeability.
In mine too You can find some cores of various sizes in things like TV's, monitors, DVD players, mostly wrapped around cables as filters.
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Question about my first SSTC
