Electronics > Projects, Designs, and Technical Stuff
Wide input and output range power pre-regulator (85–265 Vac / 2.5–52.5Vdc / 5A)
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prasimix:

--- Quote from: Sylvi on March 08, 2019, 04:33:53 am ---The schematic PDF with TR1 shows four secondaries and all of them are half-wave rectified as far as I see - one diode each. Maybe this is just the auxiliary supplies, not the main output?

--- End quote ---

Right, TR1 is for QR flyback that is in charge to provide bias powers for all circuits on the board and for connected post-regulator. The main transformer (CF-DIC output) is TR3 on the Sheet 2 of the schematics.


--- Quote ---What are you powering with your new PSU?

--- End quote ---

This converter will become a part of new modular concept (GitHub) that could accept various modules controlled by MCU locally (TFT touch-screen + encoder), or remotely (USB, Ethernet) using the SCPI commands. That is an evolved version of EEZ H24005 power supply. The first module will be a post-regulator 0-50 V / 5 A (DCP505), with 3-range current auto-ranger (50 mA / 500 mA / 5 A). Two or them can be coupled in series or parallel for double output voltage (100 V) or current (10 A).
prasimix:
I made a short video intro about pre-regulator:

Intro video
Sylvi:
Hi Prasimix

I don't see full-wave rectification on page-2 of the schemo. Maybe page-3?

It seems to me you mentioned synchronous rectification for the main output which I'm sure is one contributor to the low  noise.
prasimix:

--- Quote from: Sylvi on March 11, 2019, 05:12:43 pm ---Hi Prasimix

I don't see full-wave rectification on page-2 of the schemo. Maybe page-3?

It seems to me you mentioned synchronous rectification for the main output which I'm sure is one contributor to the low  noise.

--- End quote ---

Oops, yes it's on the page 3 :).
jbb:
Hi there

This is really coming along nicely.

Just thought I’d add my 2 cents’ worth:
1) it really is hard to make a wide range resonant converter (especially with varying Vin, Vout and Iout). It might be possible to add an auxiliary soft switching stage to the primary side but it would require extra components (switch, gate driver, L, C etc.)
2) I see you mention series connection if bench power supply outputs. This is handy for users but could be a problem for you in terms of regulatory compliance because the output won’t be Safety Extra Low Voltage any more. No problem with parallel connectors.
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