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Registered Member #8247
Joined: Thu Nov 22 2012, 03:14AM
Location:
Posts: 18
I was wondering what is the best way to ground this simple high voltage circuit? Ground is different then negative correct? And by ground its best to actually use the ground plug in my wall outlet? I guess I don't have much of a choice.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
I would like to see some high voltage rated resistance between the power supply and the capacitor (e.g. remove the 24 MOhm resistor in parallel with the capacitor and put it between the supply and the capacitor.)
This is because when the Gas Discharge Tube 'fires' the capacitor will be in parallel with the primary of the transformer, forming a resonant circuit, which will try to reverse polarity with respect to the power supply. OR Put a h.v. (>1200v) diode across the power supply output, anode to -ve, cathode (band) to +ve.
As for 'earthing' ; I'd probably put the earth exactly where you have drawn it but it's not necessary.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Note that the power supply manual says that the ground connection of the power supply can be at a maximum of 50 V from the case ground, that goes to the power line ground, if they are not interconnected. So, the power supply already grounds the circuit in normal operation.
Registered Member #8247
Joined: Thu Nov 22 2012, 03:14AM
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Posts: 18
Proud Mary wrote ...
Connecting the negative line to Earth will reduce emission of EMI by the gas discharge tube, and so is to be recommended.
I should also keep it connected to negative also. So the negative line goes to both ground and negative correct? What I am trying to stop is a "run away" pulse circuit. Sometimes in my tests the circuit (pulse rate/frequency) will slowly get faster and faster for some reason. I guess this is the resonance affect, I need to stop it. And apparently the best way to do this is connect it to ground exactly where I have it in my above schematic, and also put a diode across the power supply output like Sulaiman said. Like in parallel with the capacitor but before it in the schematic.
If anyone thinks otherwise please advise, I would appreciate it.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Ken Williams wrote ...
Proud Mary wrote ...
Connecting the negative line to Earth will reduce emission of EMI by the gas discharge tube, and so is to be recommended.
I should also keep it connected to negative also. So the negative line goes to both ground and negative correct? What I am trying to stop is a "run away" pulse circuit. Sometimes in my tests the circuit (pulse rate/frequency) will slowly get faster and faster for some reason. I guess this is the resonance affect, I need to stop it. And apparently the best way to do this is connect it to ground exactly where I have it in my above schematic, and also put a diode across the power supply output like Sulaiman said. Like in parallel with the capacitor but before it in the schematic.
If anyone thinks otherwise please advise, I would appreciate it.
Perhaps the characteristics of the tube change upon repeated firings due to a temperature-related change in gas pressure and metal ions stripped off the electrodes entering the plasma.
Generally, gas arrestors are only guaranteed to stay within the data sheet specs for a very small number of firings, so perhaps the same is true for your discharge tube too.
Perhaps you could measure the voltage across the gas tube under the conditions you describe and make a graph, or monitor it with a cautiously coupled 'scope if you have one.
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How do I ground my high voltage circuit?
