High Voltage Power Supply - Page 1
Forum section: electronics / projects

author: alexo
author_rank: Contributor
timestamp: March 12, 2017, 02:03:02 pm
content: Could anybody recommend schematics for a high voltagevariablepower supply ? If possible for around 400V ( 600V a bonus ) and current limiting, short circuit protection. Min 100mA , more a bonus, again.

author: Cerebus
author_rank: Super Contributor
timestamp: March 12, 2017, 02:40:52 pm
content: Do you mean a variable bench PSU or a PSU for inclusion inside some other piece of equipment?

author: alexo
author_rank: Contributor
timestamp: March 12, 2017, 02:56:19 pm
content: Variable. Thanks.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 12, 2017, 06:18:23 pm
content: http://www.radiomuseum.org/r/eico_1030_regulated_power_supp.html?language_id=2Tim

author: fable
author_rank: Regular Contributor
timestamp: March 12, 2017, 06:56:22 pm
content: Is 300v 50mA good enough?

author: alexo
author_rank: Contributor
timestamp: March 12, 2017, 08:37:40 pm
content: Not really - I need around 80-85mA.

author: mariush
author_rank: Super Contributor
timestamp: March 12, 2017, 08:50:41 pm
content: Here's a schematic for a 120v 1A power supply. They're using 2SC2751 transistors, which go up to 500v. I suppose you can put more in parallel and you can use several smaller transformers and maybe transformer taps to go up to 300v and let's say 100-200mAThey're using small transformer taps (about 30-40v AC per tap) to keep the wasted power in the transistors low at 1A , but if you're going to alter the design to work at only up to 100-200mA, you may be able to use common 115v -> 2x48v AC or 230v -> 4 x 48v AC secondary windings , or maybe use even 115v ac per winding , after all at 100mA in the worst case scenario (about 130-140v DC in, 1v at 100mA out you're going to dissipate about 15 watts, easily doable with 3-5 such transistors in parallel)

author: PointyOintment
author_rank: Frequent Contributor
timestamp: March 13, 2017, 07:21:39 am
content: How about theHeathkit PS-3? Even if you can't find one, the schematic's available, so you could build something based on it.

author: BravoV
author_rank: Super Contributor
timestamp: March 13, 2017, 07:43:26 am
content: This circuit only max at 500V 10ma though, but I'm pretty sure some mod by expert (not me) can increase to your requirement may be ?Linky ->http://www.edn.com/design/power-management/4403836/Regulate-a-0-to-500V--10-mA-power-supply-in-a-different-way-

author: BrianHG
author_rank: Super Contributor
timestamp: March 13, 2017, 08:26:37 am
content: What's your budget, you can use an AC transformer + power opamp like the following:http://www.digikey.com/product-detail/en/apex-microtechnology/PA15FL/598-1428-ND/1762090450v, 200ma range.http://www.digikey.com/product-detail/en/apex-microtechnology/PA95/598-1335-ND/1761959900v, 100ma range. (Recommended if your source voltage is unregulated and above 350v, this gives you excellent clearance)The rest shouldn't be too difficult except finding the right source power transformers, and additional circuitry if you want an adjustable current limiter. A little more work is involved if you want a MCU digital interface, but this may make adjustable current limiting easier.