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Class D Switching Power Amplifiers and Power D/A conversion

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Old 12th December 2012, 08:35 PM   #171
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Clipping at 630V, only stable at 16 Ohms and above..

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page 23 of the thread: my "tiny" IGBT amplifier
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Old 12th December 2012, 09:12 PM   #172
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600V bus, 20kHz, aircoils.
...must be 'some mA' ripple current circulating in your filter...
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Old 12th December 2012, 09:36 PM   #173
baga is offline baga  Romania
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FGH50N3 for 180v bus
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Old 13th December 2012, 01:54 PM   #174
fredos is offline fredos  Canada
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Sorry Baga, but no freewheeling diode, slower turn off time and still only 40A at 300Khz... Better to go with a 300V mosfet and schotky at that point...
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Old 13th December 2012, 08:13 PM   #175
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...well, better no body diode rather than a poor body diode.
But as already said by fredos, to much switching losses - even without Qrr topic.
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Old 16th December 2012, 10:02 AM   #176
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Default X-Mas

...unpacking component deliveries feels like x-mas


The Beauty And The Beast.
The picture is making the advantage in geometry more obvious.
Nevertheless I have not given up on designing the layout for TO-247 and TO-220 as well.
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Old 16th December 2012, 11:51 AM   #177
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Quote:
Originally Posted by ChocoHolic View Post
...unpacking component deliveries feels like x-mas


The Beauty And The Beast.
The picture is making the advantage in geometry more obvious.
Nevertheless I have not given up on designing the layout for TO-247 and TO-220 as well.
Looks good how much did you pay for these.
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Old 16th December 2012, 06:42 PM   #178
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I got these as a x-mas from my credit card.
...who says, credit cards don't make presents?!
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Old 16th December 2012, 11:16 PM   #179
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Ok, Ok. Just joking. Have to pay the balance on my own.
...always have been a crazy nerd and always have spend most of my money on countless electronic components. But it is easy to count my shoes.

The triple of beauties in TO-220 was around 10,- USD + taxes.

The monster triple was much costlier.
Cannot exactly say the price, because it is partially from my older assortment.
But already the MBR7030 was about 7...8 EUR.
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Old 17th December 2012, 11:07 PM   #180
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Hey choc

I tried another modulator scheme, I didn't get chance to try the modulation Charles proposed. See below might attempt this for a lower power applications > 1kw



Click the image to open in full size.

Click the image to open in full size.

Thanks
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Last edited by Reactance; 17th December 2012 at 11:33 PM.
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