In the case of a single-phase inverter (figure 1) the output voltage 
has the value
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As the PWM command of each of the arms allows to 
and to 
to have values between 
and 
, we can assign to 
a value between 
and 
since 
.
Figure 1
In steady state regime, the desired value 
for 
is generally a 
pulsation sinusod with the peak value 
.
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While considering
 |
we have
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is called the modulation rate.
So that could follow (as average) its reference, it is sufficient to consider as reference waves for P1 and P2
 |
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Indeed, we have in this case (see principle)
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 |
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Figure 2
As we must have
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it is necessary that
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therefore as foreseen
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