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Registered Member #54278
Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
I was studying the trigger circuit for the flashlamp in the small Nd:YAG laser here and have looked again and again but cannot find an explanation for some component placement;
1) R5 and R6 300kOhms @ 1/2W total...aren't the resistor power ratings here way too small? 900Vin regulated to 240Vout takes about 1.45W total resistor power, however, in the schema only 1/2 Watt is available--what am I missing? Resistors really get hot at rated power!
2) PLEASE...what is R7 (82 Ohm @ 1/4W) for? Won't C3 simply be charged through T1's primary? Even if xfmr pins 1 & 3 are not directly connected together pin 1 is still grounded--the resistance between the trigger transformer pins 1 & 2 are sub ohm, but another resister in parallel won't help here???. Also R7 shorts the primary coil of T1??
4) the 0.5W Zener is using 0.53W--maybe no big deal, unless 3/4W Zeners are readily available and good design is important!
5) Really just noticed this one--the function of RY1--not obvious to me. I was also under the impression that vacuum relays were really $$$$.
I have the entire and original SSY-1 parts including the Q-switch to experiment with--especially with tuning critical damping. I plan to scope, during the total firing duration, the lamp current, voltage and sample the direct optical output through the bulb with a reversed-biased photodiode. Then for a very large ruby laser.
Registered Member #2989
Joined: Sun Jul 11 2010, 12:01AM
Location: UK
Posts: 94
Hi I would try a quick spice simulation to see the power levels etc
2) maybe some sort of damping resistor or for shaping the ignition pulse? 5) will be a safety device for bleeding out the PFN cap (C1). I like D3 that's a nifty idea.
When you come to measure the high current pulse can you tell me how you have done it. I am looking to do the same type of thing.
Registered Member #816
Joined: Sun Jun 03 2007, 07:29PM
Location:
Posts: 156
Maybe R7 is there to cause sufficient load current for the scr to latch on, the trigger transformer is mainly inductive, with an effectively open secondary.
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Sam's SSY-1 triger circuit
