Hi ,

I was reading basics of switching regulator and I got one silly doubt.
Inside Switching regulator, we have transistor or mosfet which work as switch.
My doubt is that when switch is open how the current and voltage flowing through the circuit.
Is the Inductor or capacitor is the source of voltage?
Is the Inductor or capacitor is the source of Current?




Thanks

 

hi 123,
Look a Fig 1A of this manual.
E

 

Well done ericgibbs. Yes, the essential point is that the energy stored in the magnetic field of the inductor collapses creating a voltage (-L.di/dt) that drives a current into the load as shown by the arrows in your diagram.

 

The inductor stored energy is the source of the current when the switch is off.
The capacitor smooths the voltage due to the current variation as the inductor current increases when the switch is on and decreases when the switch is off.

 

Another approach. LC-filter.