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Registered Member #305
Joined: Sat Mar 11 2006, 04:27PM
Location: Liverpool, UK
Posts: 29
Hi gus, what a fantastic forum, the atmosphere is positively charged
anyways im wondering if you can hep, i bought an SSTC it off flea bay and ive built it but im havig problems understanding the guys instrutions on the GDT , im hoping you can help...see attatched fotos..
which wires on the GDT go where? one end of the wires is shortr than the other so you can seperate the beginning and the end f the winding. Plain english if you can, GDT arent my strong point :(
Registered Member #99
Joined: Thu Feb 09 2006, 06:10PM
Location: florida, usa
Posts: 637
What you want is to turn one of those MOSFETS on and the other off. So your signals from the GDT should be out of phase with each other. Do you have an o-scope?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
what you want to do is the following - you need to check the phase once everything is connected.
1. connect GDT to your driver and MOSFETs per your schematic
2. DO NOT POWER up the bridge circuit
3. using your oscilloscope and two probes, just touch each probe to the gates of your MOSFETs at the same time. The ground clips shouldn't be tied to anything. What you'll see is the relative amplitudes of your gate signals. make sure they are out of phase (180 degrees) with each other. If the signals are same phase, just reverse one of the secondary GDT winding connections.
Registered Member #305
Joined: Sat Mar 11 2006, 04:27PM
Location: Liverpool, UK
Posts: 29
hi, thanks again for replying, its only a handheld (single channel) scope i have, but if im reading the instructions right, im not sure what u mean by "if the waveform is in phse then u need to swap the wires over" , which wires? can u take a look at the photo of the GDT and advise me as to which colors i should be twisting together ect, from the beginning, as i said, transformer theories are not my strong point tso things have to be expained in laymans terms where thats concernd, thanks for your patience..
and the circuit only has connections for to wires (apart from the primary) and on my foto of the GDT the brown/white stripe is the primary) see pic
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
You have connections for two windings on the source and the gate of each FET. For the primary connections follow the output from the pins 6-7 of the UCCs chips
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Connect the other wire, directly to the source, under the PCV (the copper traced side). Maibe so was thought the circuit. I am not able to detect a special hole for it.
Registered Member #305
Joined: Sat Mar 11 2006, 04:27PM
Location: Liverpool, UK
Posts: 29
ok ill give that a go thanks, can you tell me how to tell on a single channel scope that the FET's are 180o out of phase? and how will the circuit behave if thier not? with the FET's blow?
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GDT problem on my SSTC
