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6F3A4768
5.6.4 Voltage Reference
(1) Voltage reference
EQ_R and ED_R, the results of current control, are input. Then, the information of power supply phase is
input and a three-phase voltage reference is obtained. Since a timing interval is provided between the ON
and OFF of the IGBTs, dead time compensation is inserted here. In addition, compensation is also applied
here when the output voltage of a specific phase saturates and the voltage reference for PWM control is
output.
(2) PWM control
The PWM control section outputs gate pulse signals based on the voltage reference of each phase.
(3) Gate board
The gate board insulates gate signals generated by the PWM section and amplifies them to drive the
IGBTs.
Fig. 5.6.4 Voltage Control
Gate pulse
WV_REF
VV_REF
VU_REF
Three-phase voltage reference
Q
Q-axis
voltage
reference
D-axis voltage
reference
ED_R 5.6.4
Power supply
phase
CNV_QO
D
θ
X = D x cos(
θ
) - Q x sin(
θ
)
Y = D x sin(
θ
) + Q x cos(
θ
)
U = X
W = -( X/2 +
2
/
3
x Y )
V = -( U + W )
U
V
W
Maximum voltage
compensation
PWM control
Gate
board
GDM
IGBT
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