Pulsed 4000vdc at range of 0 to 100hz - Page 1
Forum section: electronics / projects

author: Hellwin
author_rank: Newbie
timestamp: April 04, 2024, 04:43:01 pm
content: I need help to put together a high voltage pulsed output up to 4000vcd at most 30 watts continuously. Would anyone be willing to put it together for me. I’ll pay for it.Thanks

author: BennoG
author_rank: Frequent Contributor
timestamp: April 04, 2024, 07:23:05 pm
content: is that 30W during the pulse so 0.8 mA or so or 1.2A in 1:1000 pwm duty ?Benno

author: moffy
author_rank: Super Contributor
timestamp: April 04, 2024, 10:49:23 pm
content: That is a dangerous device, could even be fatal, some context should be required.

author: Hellwin
author_rank: Newbie
timestamp: April 05, 2024, 12:09:19 am
content: It’s not for anything dangerous. We are doing some testing ourselves. It’s not for taser or anything like that.

author: Hellwin
author_rank: Newbie
timestamp: April 05, 2024, 12:13:14 am
content: We are thinking the max output around 4000vdc with small Amp. So, 30W would be the peak output and hoping for sine wave.

author: jonpaul
author_rank: Super Contributor
timestamp: April 05, 2024, 12:40:42 am
content: load: Capacitive, resistive, arc, plasma? Insulation?j

author: RJSV
author_rank: Super Contributor
timestamp: April 05, 2024, 01:23:17 am
content: "Hello! My name is Rick and I can barely state my problem / question, at least with reasonable coherence. I've blown off any serious questions, meanwhile using nebulous terms like:'small amp', meaning low current, low power'."QUESTION: You DO understand, previous posting, where you were asked what duty cycle is your 'Pulsed Sine-wave' output, or didn't care to note that your technical 'grasp' or lack of, is supposedly made up for, by asking some 'tech types', here???Got INSURANCE, then ?and legal adult ?

author: exmadscientist
author_rank: Frequent Contributor
timestamp: April 05, 2024, 05:30:32 am
content: It is very difficult to understand the requirement here, but it sounds like the sort of thing a high-end off-the-shelf commercial hipot tester might be able to just do straight out of the box. If this is the case, don't worry how much the unit costs (probably about $5k new, less with eBay luck), just buy it, it will be cheaper than whatever else you think you can concoct (at least if you count labor hours and buying some real HV safety measures).

author: LaserSteve
author_rank: Super Contributor
timestamp: April 05, 2024, 11:26:32 am
content: Gamma High Voltage, Daytona Beach, Florida. USA.They make 1-offs as well as production devices.Don't be shocked by the flimsy web site. They have more then enough business volume, to not need energetic marketing.However you can't go the distance with too much resistance. You will need to better define your needs , frequency and load impedance.Usually they stick to DC outputs Like Thomas Edison did, but they currently use modular internals they may be able to adapt.Steve

author: tooki
author_rank: Super Contributor
timestamp: April 05, 2024, 11:54:19 am
content: Quote from: Hellwin on April 05, 2024, 12:09:19 amIt doesn’t matter whether you intend to use it for anything dangerous. The point is that such a deviceisdangerous because of the voltages involved. Because of that, the request for context is in no way unreasonable.

author: Hellwin
author_rank: Newbie
timestamp: April 06, 2024, 02:25:34 pm
content: I appreciate the inputs and I’m really here to seek help.if anyone can help me to put it together or find a unit that will fit my need greatly appreciated. Thanks.

author: BennoG
author_rank: Frequent Contributor
timestamp: April 06, 2024, 02:56:06 pm
content: Well then you need to tell us some more info on what you exactly want.1. How long the puls should be.2. The current the pulse needs to carry.3. the rise and fall time of the pulse.4. capacitance of the load.Benno

author: Hellwin
author_rank: Newbie
timestamp: April 07, 2024, 04:11:37 pm
content: Because it’s experiment for us not many parameters are set. Like I mentioned, we mainly focused on the output voltage, power and sine wave on the pulses. If pulses can be adjusted, that would be great.

author: BennoG
author_rank: Frequent Contributor
timestamp: April 08, 2024, 05:43:32 am
content: The problem is we still have not enough info.I have a psu that can deliver between -100V and -10kV at 200mA DC. To make it pulsed is a expensive operation and can damage a lot because the voltage (and energy) is very high.Benno

author: daqq
author_rank: Super Contributor
timestamp: April 08, 2024, 08:46:37 am
content: There are off the shelf devices such ashttps://www.behlke.com/separations/separation_d.htm.

author: BennoG
author_rank: Frequent Contributor
timestamp: April 08, 2024, 12:40:54 pm
content: nice find.Benno

author: Terry Bites
author_rank: Super Contributor
timestamp: April 08, 2024, 03:12:51 pm
content: As noted, this thing you want is a killer!So who do you trust? I'm sure there are plenty of people who'd have a go at building you something but few who have the credentials.Buy an off the shelf unit, its going to be a lot cheaper than being sued or whacked by your employees grief stricken family.A PWM driven H bridge operating on a 2kV supply will give you 4000V pp. You can't go down all the way to 0Hz of course. Add a lowpass section and you're part way there.Use isolated drivers using iCouplers or pulse transformers.A neon sign transformer or microwave oven transformer+ Variac could form the basis of a 2kV or 4kV supply (for half bridge) though current limiting needs to be fooproof even for a 30W power device. You'd also need to incorporate a fail safe cap disharger. Make sure you need two hands to enable the output it of course. Its very doable but probalby inadvisable to diy it.

author: tooki
author_rank: Super Contributor
timestamp: April 08, 2024, 08:18:16 pm
content: Quote from: Hellwin on April 07, 2024, 04:11:37 pmStop being evasive. In a prior reply you mentioned that you appreciate any help to find a device to fit “ needs”, yet you aren’t stating what those needs are. You either need specs, or you need to describe (in as much detail as you have) the problem you are trying to solve. Anything else is expecting us to be clairvoyant. And mind-reading is a decidedly bad way to design potentially lethal devices.

author: BrokenYugo
author_rank: Super Contributor
timestamp: April 08, 2024, 11:09:39 pm
content: I've noticed when they show up wanting some especially energetic power/RF supply and don't want to talk about the application even in broad/generic terms it's almost always some sort of pseudoscience BS.