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Registered Member #3093
Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
So, I almost finished with my mini brute drsstc, but I have a problem. While I was tuning my primary circuit, I found out that it's lowest frequency possible is too high for my secondary. (minimum frez is 350khz for the primary, secondary frez is 194khz w/ topload.) My question is, Do you think it is all right to have two CDE caps in parallel which are series w/ one? %%%%%%%%%%%%%%%%%%% %%%%%%--------||--------%%%%% x-----||-----%%%%%%%% ---------x %%%%%%--------||--------%%%%% %%%%%%%%%%%%%%%%%%% Thanks -William L
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
What are the values of the caps? How many are you using in series/parallel? What is the size of your primary? Also how do you know it is oscillating at 350KHz?
Registered Member #3093
Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
Goodchild wrote ...
What are the values of the caps? How many are you using in series/parallel? What is the size of your primary? Also how do you know it is oscillating at 350KHz?
The size of my capacitors are 0.33µf rated for 2000 volts, And I will be running 2 in parallel, which will be seriesed with one. (3 caps total) I have a 7 inch diameter primary with 1/4th OD copper tubing. The reason I have the frequency values is because I used a signal generator to test for the lowest possible frequency. (highest up tap point)
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
803 wrote ...
.33 uf is alot! That's 330 nf!
PAul
But not at all too much for a DRSSTC whre larger tank capacitance seems to be better according to the experienced DRSSTC guys, my own DRSSTC uses a 0.45uF MMC.
2 parallel capacitors in series would, in the case of using 0.15uF capacitors, give 0.1uF where the series chain shares the voltage 50/50 but the single series capacitor will see the full current and will be the weak link in that setup. Wether it works is for you to stress your coil to find out :)
Registered Member #3093
Joined: Mon Aug 09 2010, 11:40PM
Location:
Posts: 68
But not at all too much for a DRSSTC whre larger tank capacitance seems to be better according to the experienced DRSSTC guys, my own DRSSTC uses a 0.45uF MMC.
2 parallel capacitors in series would, in the case of using 0.15uF capacitors, give 0.1uF where the series chain shares the voltage 50/50 but the single series capacitor will see the full current and will be the weak link in that setup. Wether it works is for you to stress your coil to find out :)
OK thanks! I'll try it. It is that weak link I was worried about. Worst comes to worst I'll have to get new caps.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
350khz? that cant be the lowest frequency.
With your caps arranged as such, the C is 0.22uF. To resonate at 350khz requires only 0.94uH, which is approximately the inductance of a single turn of wire at 7" diameter (actually its more like .78uH). Did you really only use 1 turn for the primary? If not, you did something wrong in your measurements or setup... check it all again. Make sure you understand what you are doing. A DRSSTC primary (even small ones) are generally several uH, which with .22uF capacitance will resonate well below 194khz (id also say 0.22uF is pretty big for that frequency, implying a very low tank impedance of 3.73 ohms).
Also, a capacitor arrangement like you mention is not very good, for one thing it puts 2X the voltage stress on the singled out cap, and that cap must also handle 2X the current as the paralleled pair.
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primary res is too high in drsstc.
