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| Subject: | LF: 500kHz Classe-E |
| From: | Andy Talbot <[email protected]> |
| Date: | Thu, 6 Jan 2011 09:29:51 +0000 |
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As I have all the bits available as surplus junk on the shelves, thought I would put together a QRO class-E PA based around Alan's spreadsheet, (with mod for matching built in).
But before comitting to any particular power level / supply voltgage combination thought I'd ask what others have reliably achieved with a similar setup.
Starting parameters :
Supply voltage anything from 28 - 55V adjustable. 25 A max
PA device - IRFP452 (have a small handful, so can allow a few to go pop) Rated 500V, 0.4 Rdson, 14A, 190 Watts
Drive, accurate 50% square wave from ICL7667
Resonant Inductor - air wound with 2mm Litz wire.
I reckon that at 55V 500 Watts might be a value to aim for with a single device, with the option to back off by lowering Vsupply.
But before committing to winding inductors and making parallel combination of high voltage caps, does anyone have any practical experience? Am I aiming for too high a power perhaps.
Andy
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