thjc where elements have dimensions °C/W times. service customers

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thjc where elements have dimensions °C/W times. service customers

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Under short-time intermittent load higher current ratings permissible power semiconductors than those given data sheets continuous operating. however, necessary make shure that maximum virtual junction temperature reached under given operating conditions does exceed highest permissible value specified device. This done calculating temperature rise from total power dissipation transient thermal impedance Zthjc from junction case Zthjh from junction heatsink. Nowadays this calculation done means computer programmable calculator. this purpose transient thermal impedance curve given data sheets converted into analytic function form
thjc
where elements have dimensions °C/W times. service customers have calculated these elements power semiconductor devices.
survey formulae valid various forms short-time intermittent duty followed transient thermal impedance analytic elements presented here.
Formulae Calculating Temperature Rise Short-time duty A.1. Single pulse
Power waveform
Temperature waveform
pulse (highest value reached):
point cooling curve:
Lit.: 60747-6 (CDV 1998) (Thyristors, clause
SEMIKRON
0898
A.2. Single sequence rectangular pulses (often used approximate non-rectangular pulse)
Power waveform
Temperature waveform
general case: single sequence pulses; temperature rise pulse:
Intermittent duty B.1. Periodic sequence equal pulses:
Power waveform
Temperature waveform
0898 0996
SEMIKRON
Periodic sequence each different pulses:
Power waveform
Temperature waveform
-1-e
Oscillation with operating frequency
With controllable power semiconductors oscillation virtual junction temperature operating frequencies should considered when calculating maximum value reached. This applies short-time, intermittent continuous operating well. this purpose Rthjc value given continuous operation replaced
thjc -i=1
(10)
values used above equations replaced
(11)
valid pulsed current (short-time, intermittent operation) where pulse duration operating frequency. also replaced conduction angle
-360
(12)
calculations with R(thjc)p maximum value power dissipation used, because (thjc)p already includes average over period. values given following pages.
SEMIKRON
0898 0996
Antiparallel Thyristors Water Cooling
000906 SEMIKRON
TYPE
SKIW Zthjw 0,2034 SKIW Zthjw 0,0954 SKIW Zthjw 0,03961 SKIW Zthjw 0,05972
(K/W)
0,1239 0,07674 0,07015 0,07146
0,01017 0,02229 0,04348
0,01064 0,01986 0,005573
0,45451 0,55845 0,73588 0,54345
0,090411 0,005677 0,0007 0,093225 0,052189 0,0001 0,21673 0,0483 0,091238 0,050093 0,0099
0,001516
0,022981 0,0001
0,007432 0,001381
SEMITRANS® Power MOSFET Modules
TYPE
181A3R Zthjc 0,08645 Zthjh 0,102 Zthjc 0,03973 Zthjh 0,06141 Zthjc 0,04302 Zthjh 0,09446 Zthjc 0,0677 Zthjc 0,0677 Zthjc 0,0326
(K/W)
0,04935 0,07473 0,1053 0,0709 0,1488 0,1358 0,0452 0,0452 0,0246
0,03587 0,0452 0,00739 0,06776 0,04317 0,094 0,005 0,005 0,00184
0,008337 0,008309 0,00746 0,00993 0,01505 0,02568 0,0021 0,0021 0,00096
0,3725 1,2213 1,154 0,7245 1,845 0,1477 0,1477 0,117
0,1153 0,04345 0,1828 0,0693 0,2993 0,0326 0,0326 0,0236
0,060245 0,012384 0,00088 0,014305 0,00086 0,04387 0,03254 0,006 0,02244 0,00171 0,00171 0,00192 0,00063 0,00095 0,0002 0,00009 0,00009 0,00008
0,000634
values apply single functional element (chip)

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