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I worked for some time last night and came up with these schematics and PCB design I would like it if someone could verify these that it would work before I guild it. Thanks.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I can see flaws in your schematic. 1) How do you expect the 110V TVS's to not instantly explode in a circuit that is powered with ~160V? They are not necessary in this type of circuit, leave them out. 2) A single Zener in the FETs gates is enough. 3) I suggest to use a separate low-voltage power supply for the gates, because the pull-up resistor would have to dissipate much power from 160V. The diodes across the resistors aren't necessary. Also make sure you have proper phasing of the primary windings. Hope this helps, J.M.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
The diodes across the resistors aren't necessary.
In fact, they would blow up after about 60VDC input.
I dont get the RL snubbers on the primary either... doesnt make sense.
So anyway, your circuit is almost certain to fail as shown. The main thing is the gate supply, change it out to run from a 12-15V supply thats seperate from the high power DC input. Then id get rid of some of the other components that were mentioned.
I am updating the schematic how you told my thank you so much for the help, but how on this feedback based ZVS fly back supply do I run the gates at a lower voltage? Would it work to just supply the gate where I connect it to the supply I just connect it to 15V?
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Yes, that is how you would connect the gate supply. Be sure whatever the 15V supply is, that it can have its negative terminal tied to the negative of your main supply without causing any short circuits. Normally this wont be a problem... but in some cases it might.
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ZVS Fly back driver PCB and updated schematics
