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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
wrote ... Without an air gap in the x-former the ZVS went into the craziest oscillations my oscilloscope had ever seen.
Yes, also, if you don't have enough of an airgap, the non-linearity of the ferrite can make the circuit oscillate in a really weird mode. I think you get ferroresonance and the regular LC resonance happening simultaneously. It goes chaotic and you get squeals of various frequencies, a hiss like frying bacon, or whatever.
Try making a ZVS with a toroidal ferrite core and see it for yourself. I did, and it had me scratching my head for days as to why it wouldn't work right. I had to switch to an E core with an air gap.
Anyway, these are not 60Hz ZVS any more.
A CFL won't necessarily work off high frequency AC. They have a rectifier, but the diodes are the ordinary slow type. Ones from 230 volt countries will run fine off 320V DC, but American ones may or may not run off 160V DC. Some of the American ones have a voltage doubler rectifier that won't pass DC at all.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
@haxor That doesn't exactly help me since I need to know the number of turns, not the length of the wire. Besides, it appears that won't work anyway because it doesn't have an air gap. Try using a FBT core like me.
@others Today I'll try winding the primary over the secondary to see if that helps wit the current problem. I also want to test if a full wave rectifier will allow this to power CFLs and a SMPSs, but I don't have any UF400X diodes. I'll have to order some today.
As for not being 60hz anymore, I know we're kind of off-topic but I feel the real topic was "how do I make an inverter?",
Registered Member #3403
Joined: Sat Nov 06 2010, 11:21PM
Location: São Carlos, Brazil
Posts: 11
Going back to topic, there's a alternative to make a 120 VAC inverter making a "pure sine" wave... you can use a Bubba oscillator with a pwm generator.
Registered Member #2063
Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
Grenadier wrote ...
@haxor That doesn't exactly help me since I need to know the number of turns, not the length of the wire. Besides, it appears that won't work anyway because it doesn't have an air gap. Try using a FBT core like me.
how many turns? well i have no idea, cuz i didn't count it when i was winding it. and it works fine for me so far, i hooked it up to my 12v ZVS and it steps it up to 33 volts and drops to 24 volts when i connect it to a DC motor. and i did have a FBT core lying around b4, but i accidentally dropped it and 1 of the U shaped ferrite broke in half.
Registered Member #2893
Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
No problem, super glue will fix that fine.
The voltage drops because the transformer is too small. It can't supply enough power to run the motor. A bigger transformer will give you more power. Try running a car headlamp on a small 12v wall wart and you'll see what I mean, it just won't happen.
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60Hz ZVS
