Is this also a type of Switching Power Supply
I came across topologies for power supplies at
SMPS Power Supply Topologies: Comparison and Selection
How I am not sure will my circuit can be called as SMPS ?
In this circuit the transistor starts charging the capacitor as long as OP voltage is less than the input reference V4 Voltage.
I have been able to run it upto 2amps in LT spice
I have also been able to significantly smooth output by lowering the output capacitor and adding an high value inductor.
Its not switching it is a linear regulator.
Linear are inefficient. This is more efficient as it does not waste but store voltage in capacitor and release it. Also it has a switching component to it.
The output actually oscillates between in a narrow range but the oscillations were reduced by using a smaller cap.
I saw this
File:Low Drop Voltage Regulator.png - Wikipedia, the free encyclopedia
and it looks same as my circuit, so it must be linear regulator too
I am confused as for a 2ms timescale 100uf C1, I see this switching pattern.
Current going from transistor emitter
and yet for some values i see a constant drain of 2amps, and if its a constant 2 amp then i agree its a loss as voltage drops n heats up the switching transistor.
But looking at the switching pattern, is it STILL not switched power supply :confused:
Its linear because Q1 works in linear mode.
In a pure switching supply the transistor is fully on or fully off.
Thank you for your patience, 1 last question
I agree with you the Q1 is operating in linear mode.you are awesome
the Vb is constant 3.7volts, Ib is also constant 2.2 mA
Still :confused: I wonder why this circuit is running at 100% efficiency.
3 ohm load
input 10 volts to 3 volts
Still 1amp flows, that's 100% efficient :eek:
This images shows emitter current
free photo hosting
Even a switching regulator has some losses even though they are small.
Thanks you Nigel. now i can sleep without nightmares
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