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SCR regulated power supply

I

Ivan Matacic

Jan 1, 1970
0
I looking for schematic of SCR regulated power supply, but I can't find
anything usefull. Can you help me?

Best regards!
 
R

Rene Tschaggelar

Jan 1, 1970
0
Ivan said:
I looking for schematic of SCR regulated power supply, but I can't find
anything usefull. Can you help me?

There is a schematic in the LT1083 datasheet where they use
a thyristor to have the unregulated DC just a bit above the
LDO. I didn't build the circuit yet and thus cannot comment
on it.
At http://www.linear.com

Rene
 
F

Frithiof Andreas Jensen

Jan 1, 1970
0
Ivan Matacic said:
I looking for schematic of SCR regulated power supply, but I can't find
anything usefull.

If you do not yet know "What For" how will you know "Useful" when you find
it?

I.E: Electric Drill, Vacuum Cleaner, Welding, maybe 240V, 50 Hz AC from 12 V
DC (i.e. Mooring a Boat securely while providing power for the TeeVee).
 
C

Chris

Jan 1, 1970
0
Ivan said:
I looking for schematic of SCR regulated power supply, but I can't find
anything usefull. Can you help me?

Best regards!

If you need theory and practice in one source, try looking at the GE
SCR Manual, 4th edition. There's one on Amazon today for $8.99.
Although it's almost 40 years old, the description of the SCR
preregulator is very good. Of course, most of the specified parts are
obsolete, but you can easily substitute if you know what you're doing.

Another good source is prior art. HP made a line of SCR pre-regulated
linear power supplies back in the day. The operation manuals for these
have schematics and theory of operation, and are a learning experience.

Please provide more information on your requirements to get a more
specific answer.

Good luck
Chris
 
J

j.b. miller

Jan 1, 1970
0
SCR regulator is simple to build...

standard transformer and full wave bridge
bridge feeds anode of SCR
resistor from that point to gate ,with zener to ground.Zener sets output
voltage.
big capacitor from SCR cathode to ground.

I've used this 'bucket' regulator for over 30 years in various projects,
never had any fail,even in telecom applications.

Values obviosly depend on curent and voltage requirements.....
...but it is a start...

good luck
jay
 
Ivan said:
I looking for schematic of SCR regulated power supply, but I can't find
anything usefull. Can you help me?

Best regards!

if you can help yourself by giving more info, maybe. Meanwhile check
out the Philips G8 tv power supply.

NT
 
j.b. miller said:
SCR regulator is simple to build...

standard transformer and full wave bridge
bridge feeds anode of SCR
resistor from that point to gate ,with zener to ground.Zener sets output
voltage.
big capacitor from SCR cathode to ground.

I've used this 'bucket' regulator for over 30 years in various projects,
never had any fail,even in telecom applications.

Values obviosly depend on curent and voltage requirements.....
..but it is a start...

good luck
jay


Surely this would switch the scr on during the upswing of the supply
half cycle, no? If so, the cap would then be charged to max
unregulated. I get the feeling youre relying solely on transformer
copper resitance to limit the charge delivered per cycle, which is why
you say a big reservoir cap.

I suppose it should work though.


NT
 
J

j.b. miller

Jan 1, 1970
0
no......the zener only allows the SCR to turn on until the cathode voltage
equals the zener's value( -.6 v of course).

and this circuit as simple as it is has worked for over 30 years, 24 7 as
the saying goes.....

jay
 
C

Chris

Jan 1, 1970
0
j.b. miller said:
no......the zener only allows the SCR to turn on until the cathode voltage
equals the zener's value( -.6 v of course).

and this circuit as simple as it is has worked for over 30 years, 24 7 as
the saying goes.....

jay

Hi, Jay. Does this show the circuit you described above? (View in
fixed font or M$ Notepad):


Sec .-------.
24VAC,10A | | SCR +
o------. ,----o~ +o-------o---->|--------o----o
120VAC )|( | BR1 | | A \ K |
)|( | | | \ | V(out) approx. 10V
o------' '----o~ -o--. | G | |
| | | | ___ | ---
'-------' | '--|___|-o C ---
| R | |
| /-/ |
| Vz=10V ^ |
| | | -
'-------------o-----o----o
created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de

Thanks
Chris
 
J

j.b. miller

Jan 1, 1970
0
Yes that's it....

Looks better than my 30 year old 'chicken tracts' on napkin !!

One day I'll have to learn how to do schematics quick and easy on a
PC.......


jay
 
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