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Registered Member #2906
Joined: Sun Jun 06 2010, 02:20AM
Location: Dresden, Germany
Posts: 727
i disagree. Look at the bottom of the the transformer T. Its secondary is grounded @ J2. So there cannot be any higher voltage than the 3x D3 allow making all the diodes D2 unnecessary.. The only reason for the diodes D2 must be then that the output @ L2 may swing extremely low which i dont see happening.
My conclusion: the guy who made the circuit didnt know what he was doing or didnt draw the actual circuit. Discussing the content of the schematic is therefore leading nowhere. Just my opinion - based on not understanding the circuit.
Regarding the original question of paralleling series strands of diodes; prefer to parallel whole strands.. dont parallel individual diodes and put the "simulated bigger diodes" in series. This will flatten the V-I-curves and add all parasitic junction resistances instead of minimizing them which leads to better current sharing of the strands. At least this is my theory.
Registered Member #54278
Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
From way back; here is what I recall of the original power supply for this Hughes Q-Switched ruby laser rangefinder for the M60 tank ( I have NEVER seen the receiver...):
The spinning Q-switching 600Hz motor had a small magnet spinning with it. It would trigger a Hall effect sensor at J1. However, the orginal flashlamp was SERIES-TRIGGERED--no trigger transformer (T), and associated circuitry as you see here for pulse triggering--I think the guy used his own design. The original energy storage was in a single box (Sprague) with only two terminals "COM" and "COIL" It was refereed to as the -Pulse-forming-network- or "PFN". The best I could find on it was that it contained four 40uF caps and four coils. It was labeled (by hand): 160uF 1250V. There was no cap array. It looks like J3 connects to the lamp trigger wire. L1 is, no doubt, the pulse-forming inductor. The D2-D3 relationship is not clear to me.
The ruby was 3" x 1/4", and with the telescope mounted you could fire the laser in a large clear area and see a near-perfect crimson 'circle' on a very distant 'target' (at night of course). I cannot find the original block drawings for this laser, but I think it was all powered by 12v. There was a potted multi-voltage oscillator. Everything was light-weight...compared to the PFN which weighed only about 4-5lbs. I saw this PFN on ebay once.
Registered Member #61569
Joined: Sat Apr 15 2017, 05:12PM
Location: Germany
Posts: 28
I am replying to the original question whether standard diodes can be connected in series for higher voltages. I have build 20 high voltage diodes with each 140x 1N4007 which should give a voltage rating of 140 kV. However i am using them only to 100 kV peak. And they are not intended for 50Hz but for 10kHz for a voltage multiplier circuit. I am using this configuration for 4 years now almost weekly. So far NO diodes have failed even though i have made some shorts at 400 kV (4 Stage voltage multiplier) and 700 kV (8 Stages) without any current limiting resistors! However, all the diodes were from the same batch, but no extra capacitors or resistors are used to equalise the diodes.
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diodes in series/parallel