ICSP06027 R0
(2) Sixinput type (inverter controlled 180 sine wave commutation mode)
(Applicable model: ECN30611, ECN30601, ECN30603, ECN30604)
Â·
The formula given below assumes the use of 180 sine wave commutation mode (all arms PWM
o
o
chopping).
Total IC power consumption; P = P
IGBT
+ P
FWD
+ P
SW
+ P
r
+ P
IS
+ P
ICC
(1) Steadystate power dissipation of IGBTs
P
IGBT
= I
P
x VONT
P
x (1/8 + D/3p x cosq) x 3 + IP x VONB
P
x (1/8 + D/3p x cosq) x 3
(2) Steadystate power dissipation of Free Wheeling Diodes (FWDs)
P
FWD
= I
P
x VFDT
P
x (1/8  D/3p x cosq) x 3 + I
P
x VFDB
P
x (1/8  D/3p x cosq) x 3
(3) Switching power dissipation of IGBT
P
SW
= (E
on
P
+E
off
P
) x f
PWM
/p x 6
(4) Recovery power dissipation of FWDs
P
r
= 1/8 x (IrrT x VS x
t
rrT x f
PWM
) x 3 + 1/8 x (IrrB x VS x
t
rrB x f
PWM
) x 3
(5) VS power supply consumption
P
IS
= VS x IS
(6) VCC power supply consumption
P
ICC
= VCC x ICC
(W)
(W)
(W)
(W)
(W)
(W)
(W)
I
P
; Peak current (see Fig.517)
VONT
P
; Drop in the output voltage of the top arm IGBT @ I = I
P
VONB
P
; Drop in the output voltage of the bottom arm IGBT @ I = I
P
(1 + D x sin
t
)/2 ; PWM duty power factor during the time
t
cosq
;
Power factor
VFDT
P
; Forward voltage drop in the FWD of the top arm @ I = I
P
VFDB
P
; Forward voltage drop in the FWD of the bottom arm @ I = I
P
E
on
P
; Switching loss when the IGBT is turned on @ I = I
P
E
off
P
; Switching loss when the IGBT is turned off @ I = I
P
f
PWM
; PWM frequency
IrrT
; Recovery current of the FWD of the top arm
IrrB
; Recovery current of the FWD of the bottom arm
t
rrT
; Reverse recovery time of the FWD of the top arm
t
rrB
; Reverse recovery time of the FWD of the bottom arm
VS
; VS power voltage
VCC
; VCC power voltage
IS
; Current consumption of the highvoltage circuit
ICC
; Current consumption of the control circuit
Note) FWD: Free Wheeling Diode
(A)
(V)
(V)
(V)
(V)
(J/pulse)
(J/pulse)
(Hz)
(A)
(A)
(sec)
(sec)
(V)
(V)
(A)
(A)
I
p
0
Motor coil current (one phase worth)
o
Fig.517. Current waveform of the motor coil (Inverter controlled 180 sine wave commutation mode)

25
