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Old 13th December 2011, 06:34 PM   #1
db! is offline db!  Canada
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Default High power CCS

I'm looking to start playing with some power tubes that require relatively high B+(700+ volts) and high currents(150+mA). I would also like to stick with a solid state design to keep the design simple.

Would any of the following designs work ?

- A typical transistor & LED/Zener reference CCS. The transistor will obviously be sized according to the voltage and dissipation.

- A whole bunch of IXYS 10M90 in parallel to deliver the required current.

Any input would be appreciated!
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Old 13th December 2011, 06:53 PM   #2
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How about a simple MOSFET CCS as plate-load, a mosfet Mu -follower...?

No need for complication, ref the gate to say, half +B coupled to gate by around 4.7M and you're done....

Just make sure the MOSFET chosen has a relatively low reverse-transfer capacitance, and use a Gate-Stopper of around 400-200 ohm in Carbon Compo, and keep the Gate connections to gate-stopper and protection zener good and short...

--Seeing you're running a fairly high current, a Plate-load resistor of only a few hundred ohms is needed--Figure dropping around 15-20V across it....

Ive had good results with this idea.....
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Old 13th December 2011, 08:36 PM   #3
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I assume this is a PP output stage and the ccs goes in the cathode end. ? Then I'd go for your first suggestion.
What is the voltage available for the ccs? What tube is it?

I think u need to elaborate a little more about what u're making.

Last edited by SemperFi; 13th December 2011 at 08:39 PM.
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Old 13th December 2011, 09:06 PM   #4
tomchr is offline tomchr  United States
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IXYS 10M45 with a cascode (assuming you have the headroom) would work as well.

I see no reason a normal LED-based CCS wouldn't work as long as the devices don't see over-voltage, over-current, or SOA overload conditions. I'd probably run some sims to ensure that none of these silicon killers are present during start-up as well as normal operation. Or at least think it through...

~Tom
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Old 13th December 2011, 09:08 PM   #5
db! is offline db!  Canada
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The plan is for a CCS-loaded parafeed; B+ is around 750v or more, currents are around 150-200ma.
I am still experimenting at this stage so there isn't a formal plan. I'd at least like to get these firebottles glowing.
The tubes in question is eimac 100th and 4E27.
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Old 13th December 2011, 09:39 PM   #6
DF96 is offline DF96  England
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Could you use a pentode as CCS?
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Old 13th December 2011, 10:25 PM   #7
db! is offline db!  Canada
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Quote:
Originally Posted by DF96 View Post
Could you use a pentode as CCS?
Unless there is no reasonable way to do this with solid state parts, I'd like to avoid tube/hybrid CCS.
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Old 13th December 2011, 10:28 PM   #8
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How about IXYS IXTH 20N50D? Perhaps with the IXYS IXTP01N100D on top? (several parallel (not sure if that is possible) (1000V)

Last edited by Bas Horneman; 13th December 2011 at 10:36 PM.
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Old 13th December 2011, 10:36 PM   #9
piano3 is offline piano3  United Kingdom
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Quote:
Originally Posted by DF96 View Post
Could you use a pentode as CCS?
Hello DF, can you think of any with both suitable gain and current capability of 150mA?

Last edited by piano3; 13th December 2011 at 10:39 PM.
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Old 13th December 2011, 10:40 PM   #10
DF96 is offline DF96  England
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Well, maybe a transmitter tetrode? These go up to very big sizes.
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