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Old 22nd January 2006, 03:07 AM   #31
awpagan is offline awpagan  Australia
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Old 22nd January 2006, 04:16 AM   #32
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Quote:
Originally posted by awpagan

300v rail easy to work out but 600v?
? could reference off the 300v or bypass like this thread.

any suggestions???
you can use a pair of big Hexfets -- one as an inverting amplifier to drive the gate of the second -- the basic circuit is described in H&H -- here's a link to a version I used at one time (it is scaled to 400V but can be built for 600V) -- it used a voltage doubler and inverting amplifier scheme:
http://www.tech-diy.com/MCTracer_no_...pplyIR_FET.jpg
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Old 22nd January 2006, 04:30 AM   #33
Eva is offline Eva  Spain
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I think that such high voltages as 600V are easier to regulate by means of a flyback converter, or a flyback pre-converter outputing something quite close to the desired output voltage and then a linear regulator that won't be required to whitstand high voltages or dissipations. Current limiting may be performed also in the flyback, making things even simpler.
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Old 22nd January 2006, 05:05 AM   #34
awpagan is offline awpagan  Australia
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jackinnj and Eva, thank guys.

I already have the transforner ~700 centre tapped

don't need to voltage double, and switchmode in audio

first time i've seen a "Supertex developed a nice little (TO-92) regulator which will "do" 1.2 to 450 V -- the LR8N3"

easy enough to reg 300v

but if it like the "317's" i was thinking about base "reference" to the 300v line to get the 600v

does the LR8N3 only handle ~430v or voltage drop.

same as the 317's handle ~40v drop.
buy raising the "ground" voltage to say 30v adjust could be up to 70v

allan

ps if you get what i mean
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Old 22nd January 2006, 06:09 AM   #35
Eva is offline Eva  Spain
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You can raise the ground if you want, it works. But a lot of problems will arise during overload conditions. Also, you should make some room for line fluctuations, for example, your target output voltage should be obtainable with mains input voltages from 180V to 250V AC (80 to 130V or something like that) if you want your equipment to be smart enough to work almost everywhere. This may be a bit challenging for a linear 600V regulator, and if you want to use a standard LM317 or similar you will have to fit a pre-regulator to protect it against overvoltage.
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Old 22nd January 2006, 07:04 AM   #36
awpagan is offline awpagan  Australia
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just dug out the old amp
hammond 374 trans 750v centre tapped
so just over 1000v dc 500vdc centre
so unless i pre-reg this to drop volts, Its too high for the LR8N3 anyway.
allan
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Old 22nd January 2006, 02:38 PM   #37
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The point of the schematic which I showed wasnt' the voltage doubler -- it was the inverting amplifier regulating via an opamp error amp. instead of a DAC (a variable reference) use a high quality, low noise reference.

Eva's points are well taken -- an LM317 is only going to regulate a small portion of the possible variation in input voltage.


Sorensen makes regulated HV supplies using (I believe) forward technology, synchronous rectification, current mode control. These things are designed by teams of engineers at Raytheon -- not for the faint of heart.
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