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Forums
4hv.org :: Forums :: High Voltage
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Half bridge and GDT finaly working

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Andrew L.
Sun May 06 2007, 05:32PM Print
Andrew L. Registered Member #515 Joined: Sun Feb 11 2007, 02:06PM
Location: Slovenia/Ljubljana
Posts: 94
 		The title baisicly says it all. I finally made a working half bridge with two IRFP460 and two 250V 0.47uF capacitors, no high speed diodes and zenners for protection added yet. Firstly I tested it with a flyback and got some pretty good results. cheesey
I added a video of it on YouTube:
Link2
The circuit that I used to drive the half bridge is from CTC-labs and it works great. wink
And the gate driver works great to.
Now I just need to put it in to TC use. tongue

1178472736 515 FT0 Minisstc2v22neu
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Ken M.
Mon May 07 2007, 02:52PM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
 		What's clicking in the background when you draw the arcs? Sounds Like It may lead to failure.
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the_anomaly
Mon May 07 2007, 03:09PM
the_anomaly Registered Member #19 Joined: Thu Feb 02 2006, 03:19PM
Location: Jacksonville, FL
Posts: 168
 		hi,

I just have a question on this part I outlined in red. Circuit In the red box I don't understand how that small part of the circuit functions. I see it controls the on and off time but as to its operation I am confused.
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Electroholic
Mon May 07 2007, 03:22PM
Electroholic Registered Member #191 Joined: Fri Feb 17 2006, 02:01AM
Location: Esbjerg Denmark
Posts: 720
 		that is used to control on and off time independently of each other. diodes and resistors arranged in a way such that a different R is used in the charge cycle and discharge cycle of the RC circuit.
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Andrew L.
Mon May 07 2007, 05:58PM
Andrew L. Registered Member #515 Joined: Sun Feb 11 2007, 02:06PM
Location: Slovenia/Ljubljana
Posts: 94
WhiteArc wrote ...

What's clicking in the background when you draw the arcs? Sounds Like It may lead to failure.

That clicking is me turning on and off the power to the half bridge to avoid catastrophic failure. tongue
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Ken M.
Tue May 08 2007, 02:06AM
Ken M. Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
 		Haha well I guess I was close with the failure part, at least yer preventing it or at least hope you are!
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Andrew L.
Tue May 08 2007, 01:23PM
Andrew L. Registered Member #515 Joined: Sun Feb 11 2007, 02:06PM
Location: Slovenia/Ljubljana
Posts: 94
 		Otherwise what do you think of the performance of it?
I get better sparks with a flyback form a computer monitor, but because the voltage is so high I burned two because I didn't put it in oil. tongue (it is just too messy)And I could probably get better sparks if I would use a better power supply with more current rather then a small step-down transformer (220V-115V). angry
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uzzors2k
Tue May 08 2007, 03:24PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		Upgrade to 220V then. I use 25 primary turns and around 100kHz when I run my flybacks offline. Looks like you're getting decent results at 115V, so 220V should be great.
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Andrew L.
Tue May 08 2007, 06:43PM
Andrew L. Registered Member #515 Joined: Sun Feb 11 2007, 02:06PM
Location: Slovenia/Ljubljana
Posts: 94
 		Yeah but I'm kinda afraid of running it on 220V. But I'll probably do it.(I'll probably also have to submerge the flyback in oil to avoid breakout) angry
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uzzors2k
Tue May 08 2007, 09:31PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		Hehe, you can limit current by using a higher frequency. Just set it really high and bring it down until the flyback starts saturating. At 100kHz I can run flybacks forever, with no heating of anything. (more or less wink )
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