Search for high-voltage, low-current transformer - Page 1
Forum section: electronics / beginners

author: holka_bobra
author_rank: Newbie
timestamp: March 31, 2020, 04:45:15 pm
content: Hi there,Im working on a project, which include developing power supply for photomultiplier tube. The details are mostly under discussion, but generally this device should have up to 2kV output voltage and minimum voltage ripple. As I investigated before there are two ways:1) flyback up to 2kV2) flyback/boost converter and classic voltage multiplier with diodes and capacitorsWith the second one I have no questions, the implementation is clear, but some drawbacks (just in case of the whole project) stops me. The first one - with the flyback - looks more beauterful. The only thing - I have misunderstanding with the transformer choosing.The criterias are- turns ratio should be sufficient to provide 2kV output- dimensions and weight should be miniature- this is not a DIY project, so parts availability on the market are necessaryAnd with this ideas I have checked bunch of manufacturers (Murata, Bourns etc.) and I didnt find anything that suits me. And thats why Im here.May be some of you have an experience with such designs? It will be grateful to hear any suggestion!

author: james_s
author_rank: Super Contributor
timestamp: March 31, 2020, 05:10:10 pm
content: Typically you would design a custom transformer for this sort of thing, using an off the shelf ferrite core and bobbin.You might be able to repurpose a transformer designed for driving CCFL tubes but those are often custom to whatever equipment is using them.

author: holka_bobra
author_rank: Newbie
timestamp: April 01, 2020, 09:00:19 am
content: I know about these options, and I already consider it... Im just so suprised that its really impossible to find any transformer on the market (not CCFL) for my purpose

author: eliocor
author_rank: Unknown
timestamp: April 01, 2020, 09:33:54 am
content: See LT AN118:https://www.analog.com/media/en/technical-documentation/application-notes/AN118fb.pdf(Royer topology for very low noise/ripple)Coilcraft FL series:https://www.coilcraft.com/ccfl.cfm/https://www.coilcraft.com/fa2786.cfmmore than miniature:https://product.tdk.com/info/en/catalog/datasheets/trans_atb3225_en.pdffollowed by voltage multiplier (Cockroft-Walton)

author: Jwillis
author_rank: Super Contributor
timestamp: April 01, 2020, 08:42:47 pm
content: Quote from: holka_bobra on April 01, 2020, 09:00:19 amTo have a transformer ready available for every possible application there would be an infinite stock pile of transformers . So transformers are wound according to application.A photomultiplier tube will have a range of supply voltage so you could change the parameters of your application around a suitable transformer.

author: holka_bobra
author_rank: Newbie
timestamp: April 02, 2020, 01:45:19 pm
content: Many thanks for answers, and especially to eliocor, this app note will be extremely useful for me

author: schmitt trigger
author_rank: Super Contributor
timestamp: April 02, 2020, 03:05:11 pm
content: Another excellent AN from the late Jim Williams.His Application Notes are, without exception, 24k gold.