pm75cs1d120 Mitsumi Electronics, Corp., pm75cs1d120 Datasheet - Page 46

• Manufacturer Part Number: pm75cs1d120
• Description: Mitsubishi Ipm L1/s1-series Application Note Igbt Modules
• Manufacturer: Mitsumi Electronics, Corp.

Because reverse recovery of free-wheeling diodes occurs in half cycle of the output current, the dynamic
power loss of FWDi is
Inverter Loss Calculation Notes
current", and "V
cycle is the sum of each interval.
dependent on signal generator, load and other factors. Therefore, calculation should always be done with
actual waveforms.
Thermal Design Notes
Divide one cycle of output current into many equal intervals, then calculate actual "PWM duty", "Output
The PWM duty depends on the method of generating the signal.
V
Psw uses the value under half bridge operating case at Tj=125°C.
The output current waveform and the relationship between output current and PWM duty cycle are
(Temperature variation rate is 30% to 35% for 60Hz case. When the output current of several Hz switches
for a few seconds, it almost has equal temperature to a direct current with the same peak value
continuously flowing. )
frequency is much lower than 10kHz.
It is necessary to examine the worst switching condition.
Consideration of temperature variation due to current cycle should be given in thermal design.
Temperature ripple caused by switching operation should be considered especially when switching
CE(sat)
uses the value of Tj=125°C.
CE(sat)
Psw
1
2
8
1
2
, V
2
Irr
Irr
EC
Average Power Loss Simplifi ed Calculation
(@
Irr
(@
, and Psw responding to the current" in each interval. The power loss during one
Icp
Icp
Vcc
4
sin
sin
trr
) x
) x
Vcc
Vcc
4
trr
trr
(@
(@
Icp
Icp
46
sin
sin
) x
) x
fc
fc
dx
dx
Sep. 2008