PWM

139

02:09:33

Pulse width modulation explication.
If the switch changes its state, the Vref changes too. Then the duty cycle D changes.
If Vt(triangular carrier) > Vref(modulating) the comparator sets its state in 0V.
If Vt(triangular carrier) < Vref(modulating) the comparator sets its state in 15V.
Try to switch between the two Vref. You Will look the Vo changes.
The variation of Vref sets the D.
D=25%  with Vzener=3.75 V (0.25*15)
D=5%  with Vzener=7.5 V (0.5*15)
D=75%  with Vzener=11.25 V ~ 11.3 V(0.75*15)

published 8 years ago

lduuxkktzykzgm

8 years ago

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