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The zvs is working

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GrantX

Fri Feb 15 2013, 06:25AM

Registered Member #4074 Joined: Mon Aug 29 2011, 06:58AM
Location: Australia
Posts: 335

Arcingnoob wrote ...

Please answer :3. The arcs start as big thick arcs and end as smaller arcs. at 32 volts input. once started i read normal voltages. Then i stretch that arc. Once it dies. the volts drops to 19 also the ceramics. always smoke now. what can i do. starting to run out of them

It sounds like the ceramic capacitors are being damaged slowly. They start out fine, but as they heat up they may lose some capacitance, or dielectric losses may increase (I think, I need a clarification from someone more experienced). Can you find a datasheet for the specific caps you are using?

Ceramic caps aren't recommended for a ZVS driver, film/foil polypropylene (MKP, FKP) caps are the ideal choice.

StormInABottle

Fri Feb 15 2013, 11:19AM

Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253

Uhh. The power supply is 2 1200 watts and 1 1000 watts power supply. Tho they are all diffferejt i will be getting number four today.also the last capacitor died. Any way to make ceramics not die

Platinum

Fri Feb 15 2013, 02:18PM

Registered Member #3926 Joined: Fri Jun 03 2011, 08:32PM
Location: UK.
Posts: 525

Arcingnoob wrote ...

Uhh. The power supply is 2 1200 watts and 1 1000 watts power supply. Tho they are all diffferejt i will be getting number four today.also the last capacitor died. Any way to make ceramics not die

Build the circuit properly.

StormInABottle

Fri Feb 15 2013, 03:10PM

Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253

Hello :P ceramics are not recommended anyway. but are the only thing i can get. The circuit is built properly

Ash Small

Fri Feb 15 2013, 04:53PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

You MAY get less heating if you use more lower value ceramics in parallel. Each capacitor will then have less current to 'deal with'.

You could also try a series/parallel array using the same value capacitors that you are using, eg four strings of four capacitors will have the same capacitance as one of the ones you are using, but the current will be 'shared' between them, so each will heat up much less.

StormInABottle

Fri Feb 15 2013, 06:21PM

Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253

I get nice results at 2 uf. I got 20 100 nf 400 volts ceramics. And they worked fine for like a longer min or two. Then all gave me one nice BIG explosion

Ash Small

Fri Feb 15 2013, 06:28PM

Registered Member #3414 Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245

As others have suggested, can't you get some MKP's out of old TV's, computers, monitors, etc?

StormInABottle

Fri Feb 15 2013, 09:01PM

Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253

Well. Booth ways am out of munehs. Had some fun. Also discovered a nice secret about ceramics. If you use alligator clips to hold them. Then hold the metal pin and the body. Makes it last 5 mins more. I will see if i can get some moneys from mommy anyways those 5 mins. Did not have as much voltage drop turns out. If i start the zvs with the fbt sec shorted.i get drops. if not i can keep the voltage at 36. Also. My zvs specs are

irfp250, 490 ohm 40 watts cap. random inductor. 1n4007. 2 watt 10kohm 15 v half a watt zenner. And some 1 uf to 2 uf cap. and 5 +5 turns. Will that work if i crank it up to 50 volts. ? allllso. how can i stop a flyback diodes and the flyback itself from burning out. Some also explode. at 24 volts input. The flyback booms. While mosfets are bone cold

StormInABottle

Mon Feb 18 2013, 07:15PM

Registered Member #9252 Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253

I will be pushing my zvs driver to 55 or 60 volts. You had the specs. also. The new weird flyback i bought. I got it because it is weird. gives some purple arcs. also i found a mmc cap. it still heats. but last ages longer. So can you guys give me the number codes. models. of the flybacks that held out the strongest and gave best results. I burnt out 2 expensive flybacks. Strongest and best results. And not something to burn in a few seconds. Note it will be a zvs. from the look of the power supply. Am pushing some nice atleast 400 watts. of energy. please answer :3.

Inducktion

Mon Feb 18 2013, 09:39PM

Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068

Well firstly stop using IN4007's.... us UF4007's.

IN4007's good frequency range is up to 1khz I think. UF4007's are much higher, so they'll work a bit better.

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