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Author Topic: Shielding high voltage - i.e. where to place the Inverter  (Read 2760 times)
SchwarzerPrinz
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« on: December 19, 2006, 12:16:25 AM »

Now i know i'm new here but i find this to be of importance.

These are some ground rules. You might know them, but i'll list them for the sake of "better safe than sorry":

1) Whenever you work at your project - ALWAYS disconnect ALL components from power supply! This includes the pen board. Do this because of two reasons: first - you may accidently touch any HV-area and that is always a potentially lethal business. You might be one of those unlucky guys with a not yet diagnosed heart weakness; then the first shock might kill you at once. Anyway you will get pretty electrocutated and that's never good, neither for your nerves nor for your heart. Second - You might get a voltage peak effect from one device to another when you accidently build a short-circuit. This lashback-effect is pretty nasty and can ruin one or more platines with you not even knowing what happened.

2) Whenever you go in for close combat with your components be sure to earth yourself. The best thing is to connect yourself permanently with some earth. Second best is to grab some not insulated metal, for instance a water tap, for at least a couple of seconds. Avoid wearing shoes with rubber soles and/or floors with carpets. Don't overheat your working room, especially at dry, cold winter days which are about to come now. This is important because modern platines are so filigrane that you can ruin circuits with static electricity.

Back on topic:
Shielding high voltage is somewhat tricky. Be aware that electric force doesn't necessarily need some sort of metal to move. With each 1000 Volts, the current can flow through any material (including air) for 1 mm (0.04''). The effect is that of a lightning en miniature. So for instance a circuit with 30 kV will be able to jump over a distance of 30 mm (app. 1.2'').
Therefore you should check thouroughly which parts of your project use high voltage. First (and AFAIK only) candidate is the Inverter. The voltage varies for all different models, but 1.5 to 2 kV seem to be the average. Due to the fact that we've got very little free space within the pen boards you might be forced to place the inverter close to some electrical circuit, within range for voltage-jumping. Don't get me wrong, we're talking about a few milimeters here, so in most cases you won't have a problem. But it just so may happen that you ruin your graphic board with an unwanted voltage-jump - so better make a doublecheck on this issue.

Best regards,

SchwarzerPrinz
« Last Edit: December 19, 2006, 12:19:45 AM by SchwarzerPrinz » Logged

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