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Revolution in high power SMPSs (1kW+)?

Flyback

Well-Known Member
Hi,

What you see here (LTspice and jpeg) is the revolution in SMPS that we all awaited.
Please offer component count reduction?

This shows a way to do an SMPS of any power level, simply by paralleling multiple, simple, lower power SMPS stages that anyone can do.

Its based on the UC3902 load share controller, but improves on that by working with SMPS of any Vout, also, the current sense gain is variable, and can be done with a Hall sensor or whatever.

No longer do companies need to bare their wallets to consultancies and be fleeced just because they need 1Kw+ SMPS……Here is a high power SMPS that anyone can do, that anyone can maintain post-production.

Please assist me to make the attached even lower in component count?....the two Diff Amps could be done with InAmps, but please do you know of a good one for this? Also, the “add 100mV to current sense signal” circuit needs to be reduced in component count.

Please offer component count shrinkage?

Modus operandi:
As you can see it operates just like the UC3902…..all that’s needed is to put out a “share” bus (differential) which is just simply the highest current sense voltage of all of the paralleled stages. Then an error amp is fed this, and also fed the actual stage’s own current sense signal (with 100mV added to stop chattering)……and that then gives you all the paralleled stages sharing current nicely. The stages are simply throttled/accelerated in current output by pulling current through a resistor in the vout divider. The error amp does this via a common base and reference.

The signal voltages are near zero volts so all opamps need pos/gnd/neg supply.

The simulation does take ages to run. (any tips on speeding it appreciated). The sharing error amp is way too fast compensated, but had to be or else the sim takes till xmas.

UC3902 datasheet:
 

Attachments

  • Pllel Boost SMPSs with load share.jpg
    Pllel Boost SMPSs with load share.jpg
    221.9 KB · Views: 51
  • Pllel BOOST SMPSs with Load share.asc
    52.4 KB · Views: 30

Papabravo

Well-Known Member
Why exactly are you asking for help? It seems like you have everything figured out, and the job offers you should be receiving must be overwhelming.

ETA: Quite a bit of hype for a part that has been out for 20 years.
 
Last edited:

Flyback

Well-Known Member
Yes , and the impprovement will be in finding a InAmp which can replace those Diff Amps, with all their resistors....plus a chip to do that 100mV addition.
 

JimB

Super Moderator
Most Helpful Member
So, this is the next great thing which will revolutionise the electrical world?

A bit like those inductive LED lights which just clip on to a two wire cable.
Remember, the ones which you were banging on about in the forum, 9 or 10 years go.

JimB
 

Flyback

Well-Known Member
....Thanks, AYK, this certainly isnt new to the SMPS design and manufacture industry etc, i agree...but soon in the west, there will be a massive demand for SMPS design....and indeed assembly...as a particular "source" of cheap SMPS in the world is soon to come to a close for the West (for reasons all know and i will not (be allowed) to go into).

So the above, which very clearly shows the workings of the (old) paralelling method, will be of great use in our plight.

This is not a political thread, but i must explain the background here....we all know of the "imminent invasion", and also, who has stood with who in the current , totally unecessary invasion.
Now you can see why the above method, which brings power electronics to the masses, will be of particular use.
No consultancy is going to teach the rest of us this stuff.
Whatever consultancies who are in the west now, will not be enough for whats going to be needed.
 

For The Popcorn

Active Member
When the "immenient invasion" comes after "the source" is unavailable to the West because of "who has stood with who"[sic], my hoard of wall warts will be worth a fortune! Who will be laughing then????
 

Flyback

Well-Known Member
The attached improves on the situation of the top post...havign a truly differential "share" bus....which works well when the grounds at each linear reg are different.
LTspice and pdf as attached
 

Attachments

  • Parallel linear regulators with load share _221009.pdf
    224.7 KB · Views: 24
  • Pllel Linear regs with Load share_221009.asc
    48.6 KB · Views: 22

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