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UM0324 Datasheet(PDF) 41 Page - STMicroelectronics

Part # UM0324
Description  This user manual describes
PDF  105 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UM0324 Datasheet(HTML) 41 Page - STMicroelectronics

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UM0324
Library functions
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Sector III, VI:
Where T is the PWM period.
Now, considering that the PWM pattern is center aligned and that the phase voltages must
be centered at 50% of duty cycle, it follows that the values to be loaded into the PWM output
compare registers are given respectively by:
Sector I, IV:
Sector II, V:
Sector III, VI:
4.2.4
Current sampling in three shunt topology and general purpose A/D
conversions
The three currents I1, I2, and I3 flowing through a three-phase system follow the
mathematical relation:
I1+I2+I3=0
For this reason, to reconstruct the currents flowing through a generic three-phase load, it is
sufficient to sample only two out of the three currents while the third one can be computed
by using the above relation.
The flexibility of the STR750 A/D converter trigger, makes it possible to synchronize the two
A/D conversions needed for reconstructing the current flowing through the three-phase AC
induction motor at any given time along the PWM period. To do this, the control algorithm
must have a full control of the A/D converter peripheral.
2
Y
X
T
t
A
+
−
=
X
t
t
C
B
+
=
Y
t
t
A
C
−
=
2
2
/
4
Z
X
T
T
TimePhA
−
+
+
=
Z
TimePhA
TimePhB
+
=
X
TimePhB
TimePhC
−
=
2
2
/
4
Z
Y
T
T
TimePhA
−
+
+
=
Z
TimePhA
TimePhB
+
=
Y
TimePhA
TimePhC
−
=
2
2
/
4
Y
X
T
T
TimePhA
+
−
+
=
X
TimePhC
hTimePhB
+
=
Y
TimePhA
TimePhC
−
=



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