Hello , i need ur help
I made a dc-dc converter but the Vout its is exactly the same with Vin.
Can anyone have an idea what i got wrong?
Vin=12V
L=0.1uF
C=10mF
R=1Ω
The pulse generator have period=2*10^(-6) and pulse width=22%

 

In the case of your circuit that probably means that your switch is not being driven.

 

i just made the switch to be controlled with this logic :


and is just the same .
I have the same waveform in the output.
Have u an idea how to solve it?
Thank you for your reply

 

Possibly this is because you have a current sensor in parallel with the inductor which will short it out. Put the sensor in series with the inductor.

 

fantastic
thank u very mutch!!!

 

L=0.1uF ?!

 

Current sensor 1 is in parallel with the output through a 1 ohm resistor. I surprised you have any output at all with that arrangement.
Steve G

 

Thank u all for your replies. I want to ask something more.
I made this circuit :


and the results i take is



(yellow line) Vinput is synphasic with the current of inductor(blue line)
This is what i want.


But the voltage in resistor is lower than Vinput and also is ac .



I dont know why i cant take a dc voltage in output
And why this voltage isn't bigger than the Vinput?

Vin=0.4V
L=850uH
C=1mF
R=1.3Ω

I am in basics , so i am sorry if these questions are obvious for you.
Thank you all for your replies

 

Voltage sensor 3 should be connected across the resistor.

 

i did it and the result is :

 

Which is what you would expect. You have no reservoir capacitor on the output of the bridge rectifier so when the rectifier output follows the AC input therefore the inductor/switch/diode output must also follow that voltage.

 

fantastic
thank u very mutch!!!

This is an English language forum and most members prefer for "text speak" to not be used. Correct spelling and grammar are also appreciated.

 

Vin=0.4V

Don't forget that diodes are not ideal and will drop a certain (current-dependent) voltage. If the diode bridge input is only 0.4VAC then the bridge output will be tiny.

 

Change the resistor to 1K ohm.
SG