buildafriend

Cheap HT Power Supplies
« on: March 30, 2019, 05:11:26 PM »
Hi,

I'm thinking about buying one of these.  What do you guys think? Is there a cheaper and better option where I'm not stuck building things to fix things? It becomes a bit paradoxical at times  ;D

https://www.ebay.com/itm/New-220V-HSPY-400-01-Adjustable-400V-1A-programmable-DC-Power-Supply-Factory/273396348359?epid=26022378701&hash=item3fa7b135c7&autorefresh=true


Whoops

Re: Cheap HT Power Supplies
« Reply #1 on: March 30, 2019, 05:35:51 PM »
I have this Bench PSU and I love it:

https://uk.farnell.com/tenma/72-10480/power-supply-1ch-30v-3a-adjustable/dp/2251946

It's not an HT psu as it goes only to 30V.

I guess if you want to have something cheaper than your link and adjustable to 400V you have to build something yourself using this ebay modules:

https://www.ebay.co.uk/itm/DC-DC-Boost-Converter-8-32V-to-45-390V-High-Voltage-ZVS-Step-up-Booster-Module/273639348238?hash=item3fb62d180e:g:QhgAAOSwj91cL0Mu
« Last Edit: March 31, 2019, 04:02:00 AM by Whoops »

ruffrecords

Re: Cheap HT Power Supplies
« Reply #2 on: March 30, 2019, 07:00:21 PM »
Hi,

I'm thinking about buying one of these.  What do you guys think? Is there a cheaper and better option where I'm not stuck building things to fix things? It becomes a bit paradoxical at times  ;D

https://www.ebay.com/itm/New-220V-HSPY-400-01-Adjustable-400V-1A-programmable-DC-Power-Supply-Factory/273396348359?epid=26022378701&hash=item3fa7b135c7&autorefresh=true

i would love to see the insides of one of these just to see how it was done.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

squarewave

Re: Cheap HT Power Supplies
« Reply #3 on: March 30, 2019, 10:56:16 PM »
Presumably it's just a constant current SMPS with variable PWM / PFM to adjust the voltage.

buildafriend

Re: Cheap HT Power Supplies
« Reply #4 on: March 31, 2019, 02:56:57 AM »
I’ll post a gut pic if I get it. I’m playing the “best offer” game at the moment

This is mainly because I’m tired of not being able to inject power in place of bad HT supplies to prove the rest of the circuit as good

ruffrecords

Re: Cheap HT Power Supplies
« Reply #5 on: March 31, 2019, 03:29:04 AM »
Presumably it's just a constant current SMPS with variable PWM / PFM to adjust the voltage.

There is a kind of technical description but the English is so poor it is hard to tell what it actually means. But it does seem clear that it is some combination of an SMPS and a linear regulator.

Edit, and I do not believe the claimed 2mV ripple if it is solely an SMPS.

Cheers

Ian
www.customtubeconsoles.com
https://mark3vtm.blogspot.co.uk/
www.eztubemixer.blogspot.co.uk


'The only people not making mistakes are the people doing nothing'

Whoops

Re: Cheap HT Power Supplies
« Reply #6 on: March 31, 2019, 04:04:00 AM »
I’ll post a gut pic if I get it. I’m playing the “best offer” game at the moment

This is mainly because I’m tired of not being able to inject power in place of bad HT supplies to prove the rest of the circuit as good

Did you check this link?

https://rover.ebay.com/rover/1/710-53481-19255-0/1?toolid=20001&campid=5336911176&customid=link&mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fitm%2FDC-DC-Boost-Converter-8-32V-to-45-390V-High-Voltage-ZVS-Step-up-Booster-Module%2F273639348238%3Fhash%3Ditem3fb62d180e%3Ag%3AQhgAAOSwj91cL0Mu

squarewave

Re: Cheap HT Power Supplies
« Reply #7 on: March 31, 2019, 09:56:43 AM »
There is a kind of technical description but the English is so poor it is hard to tell what it actually means. But it does seem clear that it is some combination of an SMPS and a linear regulator.

Edit, and I do not believe the claimed 2mV ripple if it is solely an SMPS.
Absolutely. There's going to be some filtering natrually. A choke to take out the HF hash. A regulator just wired as a current source source. Then feedback for the SMPS is sampled from there maybe.

moamps

Re: Cheap HT Power Supplies
« Reply #8 on: March 31, 2019, 10:28:34 AM »
i would love to see the insides of one of these just to see how it was done.
https://www.eevblog.com/forum/testgear/hspy-power-supply/

squarewave

Re: Cheap HT Power Supplies
« Reply #9 on: March 31, 2019, 11:05:01 AM »
Wow. That actually looks really nice. The build looks solid.


alexc

Re: Cheap HT Power Supplies
« Reply #10 on: April 02, 2019, 11:33:20 PM »
400W is a lot of HV power to regulate in a small package ...  interesting, but I'm skeptical

A lot of the cheap eby stuff of this kind can be 'less than robust'  :)
I ping therefore I am


 

Related Topics

  Subject / Started by Replies Last post
1 Replies
1552 Views
Last post August 19, 2004, 04:43:04 PM
by NewYorkDave
3 Replies
2454 Views
Last post February 14, 2005, 02:14:08 PM
by dale116dot7
1 Replies
2457 Views
Last post February 21, 2005, 09:37:11 PM
by PRR
2 Replies
747 Views
Last post October 07, 2018, 02:00:15 PM
by JohnRoberts