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edge aligned pwm vs center aligned pwm

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seyyah

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center aligned pwm

What are the advantages or disadvantages of the two method? Where do their usage differ?
 

fsmyth

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edge-aligned

Describe your application and environment.
Generally, edge detection is simpler to
implement in hardware; offsets rely on
much tighter timing controls.
<als>
 

seyyah

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centre aligned pwm

Nowadays 3 ph motor control. But i also want to hear other application areas.
 

edaworm

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edge aligned

Not sure if
Center-Aligned PWM = Symmetric PWM
Edge-Aligned PWM = Asymmetric PWM

If they're similar, then it has been shown that symmetric PWM signals generate fewer harmonics in the output currents and voltages.

http://focus.ti.com/lit/an/spra278/spra278.pdf
 
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