MTBF计算公式

Spec. Vcev 600V
600V
( T1 ) TRANSFORMERS
λp=λb*πQ*πE = 0.56454290
λb= 0.00314 πQ= 30 πE= 6
lb
=
0.0018exp??THS
+
273
8.7
?
?
? 364 ?
( D51,D53 ) Power Rectifier,Fast Recovery
( C1 ) CAPACITORS,FIXED. ELECTROLYTIC, ALUMINUM
λp=λb*πCV*πQ*πE = 0.19670198
T=85℃ λb= 0.18903469
lb
=
0.00254???? S ??3 ?? 0.5 ?
+
? 1?
exp??5.09??T
?? ?
+
273
??5
πQ= 8.0
πE= 6.0
表1
All Others
πS
All Others
VS≦3.0
0.054
0.6<VS≦0.7
0.3<VS≦0.4 0.110
0.7<VS≦0.8
0.4<VS≦0.5 0.190
0.8<VS≦0.9
0.5<VS≦0.6 0.290
0.9<VS≦1.0
πS 0.420 0.580 0.770 1.000
Pins
( NF2 ) TRANSFORMERS
λp=λb*πQ*πE = 0.57022759
λb= 0.003168 πQ= 30 πE= 6
lb
=
0.0018exp??THS
+
273
8.7
?
?
? 364 ?
( BD1 ) Power Rectifier,Fast Recovery
λp=λb*πT*πS*πC*πQ*πE = 0.76189545
? ?
358 ? ?
T=105℃ λb= 0.07597903
lb
=
0.00254????
S
?3 ?
?? 0.5 ?
+
? 1?
exp??5.09??T
?? ?
+源自文库273?5 ? ??
378 ? ?
S=工作電壓／額定電壓= 0.42545455
( ) πCV= 0.2588898 p CV = 0 . 34 C 0 .18
S
?3 ?
?? 0.5 ?
+ 1?? exp??5.09?? T ?? ?
+ 273?5 ? ??
378 ? ?
S=工作電壓／額定電壓= 0.75000000
( ) πCV= 0.7788950 p CV = 0 . 34 C 0 .18
πQ= 10.00
πE= 1.00
1.2030
1
LINE FILTER : L1
0.0114
1
FR DIODE : D2 FR102
1.0A /200V
0.5876
1
FR DIODE : D1 1N4007
1.0A /1,000V
0.5876
1
Total
SUM
0.565 0.762 0.588 0.726 0.197 4.544 0.669 1.203 0.011
0.4<VS<=0.55 πT= #######
πA= 3.4 πM= 2.0 πQ= 5.0 πE= 1.0
3000 Hr計算式
λp=(λb*πCV*πQ*Πe)/(2000/w63) = 1.514671
2000Hr 計算式
( C51,C55 ) CAPACITORS,FIXED. ELECTROLYTIC, ALUMINUM
0.588
0.588
10.44
Total failure rate per million hours
MTBF=
1,000,000 /
10.439 = 95,791 HR
INPUT: OUTPUT: (1)ROOM： (2) X'FRM : T1 (3)FR DIODE:D1 (4)DE：D4 (5)X-CAP：CX1 (6)E/CAP:C7,C8 (7)E/CAP：C1 (8)Bri/De：BD1 (9)MOSFET : Q1 (10)Line Filter:L1 (11)E/CAP：C9
1.000
( C2 ) CAPACITORS,FIXED. ELECTROLYTIC, ALUMINUM
λp=λb*πCV*πQ*πE = 0.72573059
T=85℃ λb= 0.113753
lb
=
0.00254???? S ??3 ?? 0.5 ?
+
? 1?
exp??5.09??T
?? ?
+
273
λp=λb*πCV*πQ*πE = 2.27200651
T=85℃ λb= 0.5146505
lb
=
0.00254???? S ??3 ?? 0.5 ?
+
? 1?
exp??5.09??T
?? ?
+
273
??5
? ?
358 ? ?
T=105℃ λb= 0.20657561
lb
=
0.00254????
S
λp=λb*πT*πS*πC*πQ*πE = 0.58758033
λb= 0.069 πT= 3.285361 πS= 0.054 VS= 0.12 πC= 1.0
=
? exp???-
3091???? TJ
1 + 273
*
1 298
????????
(見表1)
VS = Voltage
Stress
Ratio * Voltage Appoied Voltage Rated
CUSTOMER MODEL:
MODEL NO :
DESIG N NO.:
DATE:
MTBF ( at 25℃ ambient) (Calcuated per MIL-HDBK-217F)
Test Condition: INPUT= 90Vac 50Hz
DESCRIPTION
QT
λp
Y
POWER TRANSFORMER: T1
0.22uf /275V
105 ℃ 0.1967
1
ELECTROLYTIC CAPACITOR:C7,C8 680uf /16V
105 ℃ 2.2720
2
ELECTROLYTIC CAPACITOR:C9
100uf /16V
105 ℃ 0.6694
1
MOSFET:Q1 4N60E
4.0A /600V
πQ= 10.0
πE= 1.00
TRANSISTORS,HIGH POWER,HIGH FREQUENCY,BIPOLAR
λp=λb*πT*πA*πM*πQ*πE = 1.202980694
λb= 0.035381785 lb = 0.032exp(0.354(F) + 0.00558(P))
VS= #VALUE! VS<=0.4 πT= 0.09771
πQ= 10.0
πE= 1.00
CONNECTORS,PRINTED CIRCUIT BOARD
λp=λb*πK*πP*πE = 0.01144784
λb= 0.00071
πK= 1.0 πP= 2.3 πE= 7.0
pp
=
exp?? ?
N10
1
???0.5N10=6N4 umber
of
Active
λp=λb*πCV*πQ*πE = 0.66936768
T=85℃ λb= 0.162799798
lb
=
0.00254???? S ??3 ?? 0.5 ?
+ 1?? exp??5.09?? T ?? ?
+
273
??5
? ?
358 ? ?
T=105℃ λb= 0.0859381
lb
=
0.00254????
?3 ?
?? 0.5 ?
+ 1?? exp??5.09?? T ?? ?
+ 273?5 ? ??
378 ? ?
S=工作電壓／額定電壓= 0.75000000
( ) πCV= 1.0998426 p CV = 0 . 34 C 0 .18
πQ= 10.00
πE= 1.00
( C52 )CAPACITORS,FIXED. ELECTROLYTIC, ALUMINUM
0.5645
1
BRIDGE DIODE: BD1 DB155 SCHOTTKY DIODE:D4 SB10A100
1.5A /600V 10.0A /100V
0.7619
1
0.5876
1
ELECTROLYTIC CAPACITOR: C1
33uf /400V
100 ℃ 0.7257
1
ELECTROLYTIC CAPACITOR: CX1
??5
? ?
358 ? ?
T=105℃ λb= 0.048069
lb
=
0.00254????
S
?3 ?
??0.5 ?
+ 1?? exp??5.09?? T ?? ?
+ 273?5 ? ??
378 ? ?
S=工作電壓／額定電壓= 0.29250000
( ) πCV= 0.63799 p CV = 0 . 34 C 0 .18
λb= 0.069 πT= 4.26001661 πS= 0.054 VS= 0.15 πC= 1.0
=
? exp???-
3091???? TJ
1 + 273
*
1 298
????????
(見表1)
VS = Voltage
Stress
Ratio * Voltage Appoied Voltage Rated
90VAC 60Hz 12.0VDC 1500mA
26.8 ℃ 67.2 ℃ 70.5 ℃ 63.6 ℃ 61.4 ℃ 58.3 ℃ 65.2 ℃ 73.4 ℃ 63.3 ℃ 67.9 ℃ 52.0 ℃
INPUT : 90V C1T,CR2S(.V) 117V
Fosc 60KHz
264V 368V 60KHz
πQ= 8.0
πE= 6.0
表1
All Others
πS
All Others
πS
VS≦3.0
0.054
0.6<VS≦0.7
0.420
0.3<VS≦0.4
0.110
0.7<VS≦0.8
0.580
0.4<VS≦0.5
0.190
0.8<VS≦0.9
0.770
0.5<VS≦0.6
0.290
0.9<VS≦1.0