The revolution in high power SMPS? - Page 1
Forum section: electronics / general

author: Faringdon
author_rank: Super Contributor
timestamp: October 04, 2022, 08:29:00 pm
content: 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:https://www.ti.com/product/UC3902

author: jonpaul
author_rank: Super Contributor
timestamp: October 04, 2022, 08:46:32 pm
content: no révolutioncontact the circuit designer to get free engineeringPlease do not insult power electronics consultants and real engineersa Double Foward can easily handle 1 kWj

author: capt bullshot
author_rank: Super Contributor
timestamp: October 04, 2022, 08:49:12 pm
content: Increasing output current / power by paralleled stages isn't neither revolutionary nor new.No matter whether it's done by the ease of a "current share bus" or some other topology - like an old 10kW lab SMPS that is internally built of 8 parallel converters (each of them operates current mode, and there's a common voltage loop for all of them) I rememberOne can buy "current sharing bus" enabled SMPS from many well known suppliers

author: Faringdon
author_rank: Super Contributor
timestamp: October 04, 2022, 09:55:38 pm
content: Thanks, this isnt new to "consultants and Real Engineers" 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.

author: MK14
author_rank: Super Contributor
timestamp: October 04, 2022, 11:33:22 pm
content: Quote from: Faringdon on October 04, 2022, 09:55:38 pm

author: Faringdon
author_rank: Super Contributor
timestamp: October 05, 2022, 07:05:32 am
content: Thanks, any alternatives for the diff amps connected to the share bus (lower component count)

author: jonpaul
author_rank: Super Contributor
timestamp: October 05, 2022, 07:57:32 am
content: You can learn power electronics design ...Find great text books, read and understand.Take online seminars and courses in PFC, SMPS topology, Soft Switching, Resonant design, transients etc.See IEEE, PESC, PELS, Nurenberg.Many proceedings and seminar notes are free or low cost.Build breadboards to study typical control, magnetics, layout issues. Diagonos failures and lear from istakes.In other words DO THE WORK TO LEARN THE TRADE dont try to get others to do you job, dont complain about consultants or off shore competition.Just the ramblings of an old retired EE (power/HV/consultant)Jon