IGBT Power cycling and thermal cycling capability

IGBT Power cycling and thermal cycling capability

IFX AIM

Zhou Yizheng

IGBT Module Layers of Materials

Power cycling

Failure mechanism after PC

Bond wire connection Cracks

Bond wire connection Lift-off

P o w er C y c lin g : M ed iu m & H ig h P o w er S ta n d a rd M o d u les

1.0E +04

1.0E +051.0E +06

1.0E +071.0E +08

1.0E +09

1.0E +10

1.0E +11

10100

D elta Tj in K

n (N

o .

o

f

C y c l e S tandard M odules

Tjm in = 25°C

S tandard M odules

Tjm ax = 125°C

dotted lines: estim ated

Power Cycling: IGBT3, 600V Standard Modules

1,0E +04

1,0E +051,0E +06

1,0E +071,0E +081,0E +09

1,0E +10

1,0E +11

10100

Delta Tj in K

n

(N

o

. o

f

C

y

c l e s )IGBT3, 600V

Tjmin = 25°C

IGBT3, 600V

Tjmax = 150°C

dotted lines: estimated

Power Cycling: Medium & High Power Modules

(Tjmax = 125°C)

1,0E +04

1,0E +05

1,0E +06

1,0E +07

1,0E +081,0E +091,0E +10

1,0E +11

10100

Delta Tj in K

n

(N

o

.

o

f

C

y

c l e s )Traction Modules

Standard Modules

dotted lines: estimated PC Diagram Medium & High Power Traction Modules

PC Acceleration Factor

An increase of the temperature level by 25°C reduced the module

lifetime by 50%.

Power cycle curves for IGBT4

At Tj=125℃

Two times of PC of traction module

Five times of PC than normal module

Improvement of mounting

technology

功率周次失效模式

功率周次寿命的影响因素!所使用的芯片/模块类型

!工作时的结温波动ΔT

!工作时的最高结温

!结温波动的曲线

怎样来估算模块的功率周次寿命

!1, 得到系统工作的温度波动和工作的最高结温。

¬建议使用IPOSIM仿真计算软件

FF400R12KE3:

P = I* Vcesat* D = 300 * 1.45 * 0.7=304W

仿真结果得到芯片的温度变化是46.7度

IPOSIM Characteristics

!IPOSIM is a quick selection tool for infineon IGBT modules and shorten customer development schedules.

!IPOSIM is flexible and easy for customer and has better user interface.

!IPOSIM simulation results depend on IGBT datasheet parameters.

!IPOSIM simulation can select different modules for benchmark.

!IPOSIM performs an approximate calculation of switching and conduction losses for IGBTs and free-wheeling diodes.

!IPOSIM works under the assumption of a sinusoidal output current and uses linear approximation.

!IPOSIM has the option to not only calculate steady-state operation points but