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Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
I have a couple questions about my SSTC- I used my dads triplett AC ammeter with an AC ammeter attachment that clips over one of the current carrying wires, and did some testing with my SSTC. I found that at 120VAC input, current looks like this:
On Time Off Time Current Lowest Highest 5A Lowest Lowest 12A Highest Highest 12A Highest Lowest 15A
Continuous (w/o int.) 18A
Is there a fluke (no pun intended) in my dads meter? All these figures seem really really high to me, except for the first one at 5A. That seems about normal for SSTCs. The meter was really far away from the operating coil, because otherwise, the needle always deflected full scale, even when the clamp was not around a wire :p Any suggestions, or is my full bridge actually sucking up 2160 watts when running CW? I guess I'd just be suprised if it was because I havn't popped a single mosfet yet (IXFH40N30)
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
EDY19 wrote ...
I have a couple questions about my SSTC- I used my dads triplett AC ammeter with an AC ammeter attachment that clips over one of the current carrying wires, and did some testing with my SSTC. I found that at 120VAC input, current looks like this:
On Time Off Time Current Lowest Highest 5A Lowest Lowest 12A Highest Highest 12A Highest Lowest 15A
Continuous (w/o int.) 18A
Is there a fluke (no pun intended) in my dads meter? All these figures seem really really high to me, except for the first one at 5A. That seems about normal for SSTCs. The meter was really far away from the operating coil, because otherwise, the needle always deflected full scale, even when the clamp was not around a wire :p Any suggestions, or is my full bridge actually sucking up 2160 watts when running CW? I guess I'd just be suprised if it was because I havn't popped a single mosfet yet (IXFH40N30)
If the needle (i'm assuming its analog meter) is steady during operation, then the current reading is probably valid.
The IXFH40N30 are rated for 40A @ 300V. Provided they are cooled, there is no reason they can't handle switching that much power.
If I run my Plasmasonic Audio Modulated SSTCs at full CW i easily get close to 2kW. They are usually consuming about 1kW when i run normally (50% duty)
Without additiona knowledge on what you doing (circuit, output arc performance, etc...) i would guess your numbers are real.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Those figures seem about right to me. Especially if your dad's ammeter is a moving iron type that reads true(ish) RMS, and you have a large filter cap on your DC bus. The spiky current waveform due to charging the big capacitor makes the RMS current higher still.
You can tell if a meter is moving iron because the dial will almost always be non-linear: the numbers are all squashed up at the bottom end and stretched at the top.
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SSTC current Draw
