+-1600 v power supply - Page 1
Forum section: electronics / projects

author: alireza7
author_rank: Regular Contributor
timestamp: September 18, 2017, 06:33:26 am
content: hi i seek for a +- 1600 v and 5 ma dc power supplymy input voltage is 12v dcmy first idea is using a 1:266 transformer and i attached the picture of the circuitis it a good idea?do you have a better idea?

author: Molenaar
author_rank: Regular Contributor
timestamp: September 18, 2017, 06:40:51 am
content: I would look into ZVS drivers.Does the supply need to be regulated?

author: alireza7
author_rank: Regular Contributor
timestamp: September 18, 2017, 06:49:24 am
content: it can have at most 50 v ripple

author: bd139
author_rank: Super Contributor
timestamp: September 18, 2017, 06:56:59 am
content: There's going to be 3.2Kv on that transformer. It will flash over or fail. I know because it's a dick winding HV transformers. I have set fire to, arced and popped about 5 trying to do what you are doing.Build a royer converter on the primary (google it). The secondary, be reasonable and aim for 400v or so then multiply up the voltage with a diode/cap network. Use an E core ferrite transformer. I can't remember the size I used but I got +/- 2Kv out at around 4mA easily. Wound for 2.1v/turn on a ferroxcube core. Think it was about 65% efficient which isn't terrible. This was to bias a 3JP1 CRT for a clock. Cancelled because I dropped the damn CRT.

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: September 18, 2017, 08:10:23 am
content: Can you build it with this simple Boost converter, and also generate the negative with a single diode and cap?

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: September 18, 2017, 08:16:56 am
content: Thanks blueskull, So then do you suggest any circuit?

author: alireza7
author_rank: Regular Contributor
timestamp: September 18, 2017, 09:21:50 am
content: Quote from: blueskull on September 18, 2017, 08:22:32 amis it your intent?i tried this circuit and it did not give me sufficient current.

author: alireza7
author_rank: Regular Contributor
timestamp: September 18, 2017, 09:32:25 am
content: Quote from: blueskull on September 18, 2017, 09:24:09 amyes you are right.i used 10nf capacitors , do you think if i use 10uf capacitors my problem will be solved and i will get my desired current?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 18, 2017, 09:41:48 am
content: Quote from: alireza7 on September 18, 2017, 06:33:26 amIf it's a 1-off, something like this (this is 3.3mA but I'm sure there are others in the range)https://www.digikey.co.uk/products/en/power-supplies-board-mount/dc-dc-converters/922?k=dc-dc&k=&pkeyword=dc-dc&pv1525=438&pv1525=402&pv1526=81&FV=ffe0039a&mnonly=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

author: ali_asadzadeh
author_rank: Super Contributor
timestamp: September 18, 2017, 10:31:29 am
content: QuoteI'm interested, what are the equations?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: September 18, 2017, 10:59:58 am
content: The transformer in a CCFL backlight inverter might be a good starting place as it should have insulation good for that voltage - for 5mA, probably a big one from a monitor.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: September 18, 2017, 05:03:25 pm
content: Well, I did this,Easily modified for bipolar output. Output is clean and stable (above about 500V, or at modest load). Control is linear for simplicity.Although I'm not sure how safe it is, giving out circuits capable of lethal voltage, to beginners...Tim

author: bd139
author_rank: Super Contributor
timestamp: September 18, 2017, 05:51:26 pm
content: Bar the feedback section which mine didn't have, that's pretty much what I put together. Annoyingly the transformer saturated at audio frequencies on the first attempt so I took a couple of primary windings off and changed the ratio. Oh and I used bipolar transistors (tip41c) because I had run out of MOSFETs. When I say ran out I mean I let the magic smoke out of them.

author: Zero999
author_rank: Super Contributor
timestamp: September 18, 2017, 06:29:32 pm
content: One of the diodes in the schematic, attached to the original post is the wrong way round.A 1600V should be fairly easy to hand wind and shouldn't need to be potted or immersed in oil, not to arc over. One just has to wind it in layers, to keep the voltage between each winding below 500V or so. I have done this before and found it very boring, but doable. Going over around 2kV, is when it starts to get tricky.Does it need to be regulated?Is efficiency a concern? If not, the plain, old TL431 can be used, with a load of BJTs cascoded, to regulate as higher voltage as you like. The downside is that at 3.2kV 5mA, transistors will be dissipating a total of 16W, when nothing is being powered. The PSU below will output 1kV but it can easily be changed to 1.6kV.

author: bd139
author_rank: Super Contributor
timestamp: September 18, 2017, 09:57:44 pm
content: The TL431 is becoming another 555 class IC. So useful.

author: LaserSteve
author_rank: Super Contributor
timestamp: September 19, 2017, 02:02:29 am
content: Two EMCO HV E series modules might be cheaper, or see what Gamma High Voltage has laying around. Youl'll have to call Gamma, they do enough OEM and scientific sales that they only need a minimal web site.Usually there are a lot of Emco modules on Ebay and/or Amazon.S.