12 Mei 2009

DC Regulator Design with Linear Positive-Feedback

Firstly, I am supposed to tell you that after googling several days I still can not yet manage to make a switching power supply using this design. It's too intricate to deal with hands.
From some references especially at http://www.tangentsoft.net/elec/opamp-linreg.html I have learned that Op-Amp regulator has managed to be a very dependable voltage stabilizer so far. It happens practically when we measure the voltage stabilization right on the regulator terminal just next to the negative feedback junction.
In any practical application, we get used to using copper as the finest conductor (having low resistance) for transmitting electric energy into some devices. But since either copper or any other metal is obviously a bit resistive, according to the Ohm’s Law there must be some voltage leakage of:
V (drop) = I (Load) x R (Transmission)
The more the current, the higher the voltage drop. So, we now have a new characteristics chart of regulation on the load terminals as follows:
After making some experiments for weeks on end, I finally managed to make a regulator design which relatively ‘eliminates’ the unexpected voltage leakage while loading by using the so-called linear positive feedback.To tell you the truth, this design actually applies both existing feedbacks, negative and positive feedback. As used in a conventional regulator system, negative feedback maintains stabilizations against any voltage drop caused by current load. By means of a sensing resistor in series with the loads, positive feedback will automatically generate some given additional voltages which are equivalent with the voltages reduced/dropped by the conducting wire for any current draw. Consequently it will result in a relatively constant voltage on the load terminals for either full or zero load. Practically it happens after manually calibrating the needed positive feedback directly to the given conductor once it is installed. You need not re-calibrate this positive feedback for the next time as long as you don’t change the conducting wire. Every wire has their own resistance, don’t they? The circuit seems to have made a better performance entirely (I think) rather than that of the conventional one especially in overcoming voltage leakage in the conducting wire. We can fix the LR (Load Regulation) below or even above 100% as required which we cannot find over any other conventional regulators. It acts as if it were an ideal regulator with the characteristics:
Chart 2: DC Regulator Design with Positive Feedback

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