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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061
Has a scope and function generator thanks to a generous guy from Polar Only required a fuse too, looks like the exact part was unobtainable as it was not a standard size.
Also received from FEC /element 14 some 200 BYG21M-E3/TR 1.5A 1000V fast diodes so if anyone would like some PM me and we can come to some arrangement ie component swappage.
I did notice that many "budget" (cough Greedbay /cough) diodes are anything but fast, sure they may take 40KV but are slower than a slug in ice cold treacle electrically speaking. (ie start to run away at less than 300Hz!) This means your bargain diodes may be utterly useless for running off anything but a homemade low frequency transformer which means custom windings and a lot of hair pulling and teeth grinding.
Lesson learned, if the seller advertises a speed divide it by two and if still within spec order a few first test THEN order lots and don't be afraid to confront them with the test data if they don't work.
Also an idea I had is to use pulse trains ie normally 140Hz but every few hundred ms a train of 10kHz pulses applied with a separate transformer winding to get the extra power without heating the diodes.
I think this is being used on some LED lamps to get around the 50Hz (60) flicker problem but not sure, maybe someone has a schematic?
Registered Member #149
Joined: Sun Feb 12 2006, 09:11AM
Location: Netherlands
Posts: 12
Antonio wrote ...
The HVR-1X diodes seem to be the same thing. The datasheet mentions 50 ns of recovery time, and shows a test circuit.
I just measured one, a hvr-1x the same way as in my previous posts. at 10kHz +- 15 V square wave. rise time 7 ns through 50 Ohms. The first 2.5 us it fully conducts. Then exponential decay towards blocking takes about 20 uS, 90% rectifying. It actually got warm in this measurement !!!
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HVM12 Diode Recovery Time
