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PFCi
2.2 Detection of Induced Voltages
Induced voltage
U
Vbus /2
V
Vbus/2
W
Vbus /2
Comparator
Output Signal
U
V
W
Figure 3.1.3 Detection of zero-crossing of induced voltage and comparator output
The output pattern of the MCU depends on position information of induced voltages. The
voltages output by the inverter are compared with half the bus voltage, and the results are fed to
the MCU. The following table shows the connection between MCU pins and induced voltage
signals.
RSBJEUM0001-0101 Rev. 1.01
PDi
0
1
0
1
1
X
Table 3.1.2 three states of output pin
30 dgr
Input pin
P1
/
INT
3
5
P1
/
INT
4
6
P1
/
INT
5
7
Table 3.1.3 the connection of input pin and induce voltage
Pi
Output
0
1
X
PWM
30 dgr
Switching output pattern
Zero-crossing of induced
voltage
BEMF signal
W_BEMF
"L"
"H"
V_BEMF
U_BEMF
11
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