PrathikP

modified 5 years ago

Buck Converter 3.0

282

03:26:25

Close the switch to start.

Pardon the overshoot. I can't quite eliminate it without a current limiting circuit or min/max duty cycle limiting.

A Buck Converter is a DC-DC switching converter that efficiency steps down a DC voltage.

Previous Version: https://everycircuit.com/circuit/5573913887899648

For more information, visit https://en.m.wikipedia.org/wiki/Buck_converter

published 5 years ago

walkemm

5 years ago

An interesting circuit, but needs refinement: if the input voltage is more than 20 Volts, the P-Mosfet remains in the open state and the input voltage passes unhindered to the output

PrathikP

5 years ago

The reason is that the op amps are unaffected; in the real world, op amps have voltage rails and their voltage would increase with the input. I have requested @Igor to add op amp with voltage rails. Till then, you must keep in mind that the op amp's voltage is fixed and doesn't vary with the input

PrathikP

5 years ago

I actually thought you would be aware of this, @walkemm. You are an old user.

walkemm

5 years ago

This is understandable: for the same reason, I try not to use OPV in the simulation of power supply circuits. But I would like to draw your attention to the management of P-Mosfet: I think the best way would be to connect the OPV output via N-Mosfet. I also want to offer a simplified version of your circuit.

walkemm

5 years ago

https://everycircuit.com/circuit/5712135211188224

PrathikP

5 years ago

Your link opens in the browser app. Please send an android link. EC browser doesn't work for me.

PrathikP

5 years ago

And regarding connecting the op amp output via an NMOS to drive the PMOS switch, it makes more sense to use an NPN BJT for these auxiliary tasks. An NMOS would be a waste.

fatcat2

5 years ago

For opening the link, cut and paste the number in the search section.

PrathikP

5 years ago

Thankyou @fatcat2

PrathikP

5 years ago

Ok @walkemm, I have now taken a look at your circuit. It is simple, but quite flawed, I'm afraid. Number one, it lack a zener diode for gate voltage protection. Number two, the NMOS is a waste, as I said. Number three, the switching MOSFET is not driven by a proper driver due to which it's switching losses are high.

PrathikP

5 years ago

Although it is simple, it is not robust. But I will take a closer look and study it. The circuit interests me none the less.

wyoelk

5 years ago

In Android, go to Settings, General, Apps, EveryCircuit, Open by Default, Supported Links and see if EveryCircuit is listed first

PrathikP

5 years ago

Your circuit doesn't overshoot, with is a good thing

PrathikP

5 years ago

"Settings, General, Apps, EveryCircuit, Open by Default, Supported Links and see if EveryCircuit is listed first" such things do not appear for me. It only says enable ice symbol and keep editor on.

wyoelk

5 years ago

Sorry PrathikP, I should have said from the Android home screen, not within the EC app itself.

PrathikP

5 years ago

I checked it @wyoelk It is set to open with this app itself. But oddly, it doesn't.

PrathikP

5 years ago

It's a post update thing. I didn't have this issue pre-updade. I guess I'll have to follow fatcat's method

wyoelk

5 years ago

Well we tried, email the problem to info@EveryCircuit.com would be my next guess

krad246

5 years ago

Looks super super clean

wyoelk

5 years ago

I found that if the https is just http it opens in the app not the browser

PrathikP

5 years ago

For me that doesn't work

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