Crude SMPS

240

03:12:17

Turn on the switch AFTER starting the simulation, else the simulation will not run

Switched Mode Power Supply. This is a simplified/crude version of what (usually) sits in your phone charger (and many other things). The lack of a transformer allows the circuit to be smaller. A transistor that rapidly switches between fully ON and fully OFF also reduces power loss as heat (which would be high if the voltage reduction came just from resistors)

The ~3 ohm resistor represents the load (such as your phone)

Edit: Circuit updated to be more stable and handle higher load as per recommendations of comments

published 7 years ago

selman

7 years ago

No inductor no SMPS

BillyT

7 years ago

Too wide a voltage variation, and a phone will draw up to 1amp (5 ohms) .

LeeXabyz

7 years ago

Inductor is not a critical component. It is a filter. Hence the "crude". There are many other things missing if you want to compare with a completed SMPS. I couldn't get the voltage to be any more stable without the simulation crashing, though this will work in a real-life circuit (I wouldn't recommend it with the high voltage though, like I said, it's pretty crude and is only intended to demo the basics)

LeeXabyz

7 years ago

Phones can draw much more than 1 amp, if you didn't know. 1 amp is a minimum of sorts, actually

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