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Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Wind the secondary with heavier wire and use fewer secondary turns per primary turn. A transformer trades voltage for current or vise versa. The core has a limited capacity for magnetic flux, so once you're driving it as hard as you can at a given frequency, adjusting the secondary turns count will trade off voltage or current.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
For a given transformer you can increase the number of primary turns and resonant capacitor value, this will make it run at lower frequency and increase output current.
Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Dr. Kilovolt wrote ...
For a given transformer you can increase the number of primary turns and resonant capacitor value, this will make it run at lower frequency and increase output current.
Up to a point. You are still limited by core saturation, which is less of a problem as you go up in frequency. There is an upper limit too, as losses in the core also increase with frequency. Increasing the number of primary turns also decreases the volts per turn.
Altering the value of the inductor in the driver circuit should alter the power too. With a stock flyback you are still limited mostly by copper losses in the secondary winding due to the hair thin wire.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
make shure your capcitor is low inductance polypropelyne if you want more output.
if you use a cap with lower inductance and increase primary wire size to 16-14 awg your primary circulating current will increase at resonance. your secondary has a certain resonant freaquency. I had cupple of cap vaues handy and slowly add more caps till the primary resonance and secondary res is the same. there are two modes of operation with ZVS current mode and voltage mode. voltage mode happens at Fres and current at 1/2 Fres just try adding caps and let us know how it goes.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
I've noticed that a ZVS has a metastable state. Depending on the size of the air gap it may operate at a relatively lo frequency, or a high one. Too tired to explain further. :p
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
Hi Grenadier, I am not sure how to explain it but if you have a signal generator and a general purpose scope you can see what I mean. Steve Wards sight has a better description hears the link for the ccps flyback
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How to increase current of ZVS driven flyback?
