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:
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: