PWM Review
T
t
PWM representation
PWM representation
PAM representation
PAM representation
T
t
t
Original Signal
Original Signal
PWM Signal Representation
PWM Signal Representation
same areas (energy)
same areas (energy)
Why Use PWM in Digital Motor Control?
Why Use PWM in Digital Motor Control?
Desired motor phase currents or voltages are
Desired motor phase currents or voltages are
known
known
Power switching devices are transistors
Power switching devices are transistors
Difficult to control in proportional region
Difficult to control in proportional region
Easy to control in saturated region
Easy to control in saturated region
PWM is a digital signal
PWM is a digital signal
⇒
⇒
easy for DSP to output
easy for DSP to output
PWM approx.
PWM approx.
of desired
of desired
signal
signal
DC Supply
DC Supply
Desired
Desired
signal to
signal to
motor phase
motor phase
?
?
DC Supply
DC Supply
Unknown Gate Signal
Unknown Gate Signal
Gate Signal Known with PWM
Gate Signal Known with PWM
PWM
PWM
C28x - Event Manager 7 - 5
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