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4hv.org :: Forums :: High Voltage
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Boost converter

Author Post
ZakWolf
Wed Feb 29 2012, 11:58PM Print View
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 530
I am building a compact pistol coil gun and need a very small circuit for charging.

Sorry to ask, I have searched 4hv and Google for 2 days now and having found what i want.

I would like a boost converter that utilizes a irf510 and a 555, or just a small transformer driven by the irf510 that puts out ~400v.

Input voltage ~3-6v

At least something better then those awful flash circuits.

Im trying to do this with scrap parts i have.

Any help is much appreciated.

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Thomas W
Thu Mar 01 2012, 12:04AM
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location: UK, Dorset, Broadstone
Posts: 1211
what about a tiny ZVS with a computer PSU ferrite core rewound?
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ZakWolf
Thu Mar 01 2012, 12:28AM
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
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Posts: 530
made with irf510's? Its gotta be 3/4" long X 3/4"wide X 1/2 tall

This or this ?
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ZakWolf
Thu Mar 01 2012, 02:30AM
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Joined: Sat Aug 14 2010, 08:33AM
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I used this and a 4 stage multiplier and got 200v with 6v in.

Is there any way to make output more? remove a resistor or change a value ?

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Turkey9
Thu Mar 01 2012, 08:00AM
Registered Member #1451
Joined: Wed Apr 23 2008, 03:48AM
Location: Boulder, Co
Posts: 661
Boost converters are pretty easy and can be made very small. There are examples all over the internet of their theory. Read up on that and you'll be able to put one together that should be able to meet your needs.
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Forty
Thu Mar 01 2012, 04:58PM
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
.75"x.75"x.5"? That's certainly a size restriction. The only things I could imagine fitting into that are a 555 driver with a camera transformer (as is or carefully rewound), a single transistor circuit like the original camera circuit, or a boost converter. A boost converter might have the best power output and will easily allow for charging regulation because they tend to use the 555 timer. two well known examples can be found at and (2nd or 3rd variants)
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Marko
Thu Mar 01 2012, 05:09PM
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Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Tom Williamson wrote ...

what about a tiny ZVS with a computer PSU ferrite core rewound?


Yup, certainly looks like a much better idea than the infamous boost converter.

An ATX transformer will offer loads of power but a smaller one could also be used, especially if the battery pack is not able to provide hundreds of watts peak.

Marko
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ZakWolf
Thu Mar 01 2012, 07:11PM
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Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 530
Beam tetrode wrote ...

Tom Williamson wrote ...

what about a tiny ZVS with a computer PSU ferrite core rewound?


Yup, certainly looks like a much better idea than the infamous boost converter.

An ATX transformer will offer loads of power but a smaller one could also be used, especially if the battery pack is not able to provide hundreds of watts peak.

Marko


ATX transformer as in the yellow things?

I have a mini core .5X.5X.5 that i can rewind.... very tricky

Can i power the ZVS with 6v and can i use irf510 mosfets ? wimpy little things
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Pinky's Brain
Thu Mar 01 2012, 08:59PM
Registered Member #2901
Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837
You can buy small purpose build flyback transformers for capacitor charging by Wurth and Coilcraft, they are a couple bucks, fall right in the voltage range you want and are compact.

Some people here have used them before :
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ZakWolf
Thu Mar 01 2012, 11:30PM
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 530
Pinky's Brain wrote ...

You can buy small purpose build flyback transformers for capacitor charging by Wurth and Coilcraft, they are a couple bucks, fall right in the voltage range you want and are compact.

Some people here have used them before :



i dont want to order anything, im trying to make everything.

Thanks though

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Forty
Thu Mar 01 2012, 11:38PM
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Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
coilcraft samples them for free. They've got lots of inductors as well.
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ZakWolf
Fri Mar 02 2012, 12:10AM
Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 530
Forty wrote ...

coilcraft samples them for free. They've got lots of inductors as well.


Will the zvs charger work with irf510's?
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