J
John Fields
- Jan 1, 1970
- 0
here is the transformer i bought and i have 2 of them.
http://www.allelectronics.com/cgi-bin/item/HVS-1/480/GAS_TUBE_SIGN_POWER_SUPPLY_.html
Specifications: Input: 12 Vdc @ 1 Amp (Suggested power source CAT#
DCTX-1215). Output: 2,000 Vac @ 10 mA. Open circuit voltage: 3,000 Vac
30Khz. Short circuit current: 15 mA. UL.
---
Small inconsistency: The input power is specified as 12 watts, max,
while the output power would be 20 watts if the output voltage was
RMS.
From the output voltages shown on the PDF data sheet:
http://www.allelectronics.com/spec/HVS-1.pdf
It appears that the simple rectified DC is 3kV unloaded, which would
make it 2kV, peak, with a 10mA load. 2kV peak is 1414VRMS, so
that's 14.14 watts with a 10mA load, which is still higher than the
input so there's something gone awry somewhere. In your
application, though, it shouldn't matter. One thing to remember,
however, is that as the capacitor charges it will draw less and less
current from the high voltage supply so when it's fully charged the
supply will have risen to its full unloaded value of 3kV and the cap
will be charged to 6kV!
---
I got the recomemded 1.5 amp power supply however other findings
show that is a bit much current for this devic and i got another
adapter that outputs 1 amp , again i dont want to burn anything
out.
---
As someone else posted, the high voltage supply (the 'inverter')
will take whatever current it needs from the DC supply, so as long
as the output of the DC supply stays close to 12V when it's loaded
by the inverter you should be OK. That 1.5A part doesn't seem to be
regulated, though, which means its output might rise high enough to
hurt the inverter if the inverter doesn't load it enough, So I'd use
the 1 amp one just to be safe.
---
i got an asortment of resistors and diodes as i was not sure what to
get.
6 x 220 ohm 3 wat , 3 x 1k ohm 5 wat.
10 x .2 amp 6k diodes and a wackload lower voltage ones that prob
will not ever need now
as for the home made cap i made from 6mil polyethelene which someone
else used, surface area for diferent caps for now are ony small for
testing now and will get bigger later. ( dangerous either way im
sure )
foil surface area is about 30 cm x 5 cm for each pos and negative
plate and tightly rolled around a dowel.
---
Those two plates, with a polyethylene dielectric 0.006" thick and a
dielectric constant of 2.25 will get you a capacitor with a
capacitance of about 2nF.
---
other caps are same materials but smaller surface area . later for
good discharges i may have to go 10 or 50 times the size as the one i
mentioned. i dont expect you to do all the math as im lazy however
just want you to have a better idea what i have to start with other
then loads of pexiglass
---
OK.
Just for grins I ran a simulation with two different doublers you
may want to play around with:
Version 4
SHEET 1 880 680
WIRE -784 160 -864 160
WIRE -656 160 -704 160
WIRE -624 160 -656 160
WIRE -496 160 -560 160
WIRE -864 176 -864 160
WIRE -80 176 -112 176
WIRE 16 176 0 176
WIRE 112 176 80 176
WIRE 160 176 112 176
WIRE 272 176 224 176
WIRE -496 192 -496 160
WIRE -112 240 -112 176
WIRE 112 240 112 176
WIRE 272 240 272 176
WIRE -864 288 -864 256
WIRE -496 288 -496 256
WIRE -496 288 -864 288
WIRE -496 320 -496 288
WIRE -112 368 -112 320
WIRE 112 368 112 304
WIRE 112 368 -112 368
WIRE 272 368 272 304
WIRE 272 368 112 368
WIRE -112 400 -112 368
WIRE -656 416 -656 160
WIRE -624 416 -656 416
WIRE -496 416 -496 384
WIRE -496 416 -560 416
WIRE -496 448 -496 416
FLAG -112 400 0
FLAG -496 448 0
SYMBOL voltage -112 224 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V1
SYMATTR Value SINE(0 3000 25000)
SYMBOL diode 160 192 R270
WINDOW 0 71 28 VTop 0
WINDOW 3 65 26 VBottom 0
SYMATTR InstName D1
SYMATTR Value 1N4148
SYMBOL cap 80 160 R90
WINDOW 0 -39 33 VBottom 0
WINDOW 3 -35 32 VTop 0
SYMATTR InstName C1
SYMATTR Value 2e-9
SYMBOL diode 128 304 R180
WINDOW 0 -38 32 Left 0
WINDOW 3 -73 -1 Left 0
SYMATTR InstName D2
SYMATTR Value 1N4148
SYMBOL cap 256 240 R0
WINDOW 0 47 33 Left 0
SYMATTR InstName C2
SYMATTR Value 2e-9
SYMBOL voltage -864 160 R0
WINDOW 3 24 104 Invisible 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value SINE(0 3000 25000)
SYMBOL diode -624 176 R270
WINDOW 0 32 32 VTop 0
WINDOW 3 0 32 VBottom 0
SYMATTR InstName D3
SYMATTR Value 1N4148
SYMBOL diode -560 400 R90
WINDOW 0 0 32 VBottom 0
WINDOW 3 32 32 VTop 0
SYMATTR InstName D4
SYMATTR Value 1N4148
SYMBOL cap -512 192 R0
WINDOW 0 47 33 Left 0
SYMATTR InstName C3
SYMATTR Value 4e-9
SYMBOL cap -512 320 R0
WINDOW 0 47 33 Left 0
SYMATTR InstName C4
SYMATTR Value 4e-9
SYMBOL res -688 144 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R2
SYMATTR Value 100k
SYMBOL res 16 160 R90
WINDOW 0 0 56 VBottom 0
WINDOW 3 32 56 VTop 0
SYMATTR InstName R1
SYMATTR Value 100k
TEXT -42 386 Left 0 !.tran .1
The simulator, if you don't already have it, is
"LTSPICE/SWITCHERCAD III", is free, and you can download it from:
http://www.linear.com/company/software.jsp
One final thing, notice that I used 1N4148's for the HV diodes.
Through the magic of simulation that works, but don't try it at
home!