
WESTCODE Positive development in power electronics
R500CH20 to R500CH28
Provisional Data Sheet. Types R500CH20 to R500CH28 Issue 1
Page 7 of 13
January, 2000
14.3 Recovery parameter estimation
Maximum recovery parameters may be calculated, using the polynomial expression:
∑
=
=
1
0
n
p
R
p
dt
di
k
y
Where: y
= recovery parameter (QRR, QRA, IRM or tRR)
kp = coefficient found in the relevant table below,
n
= number of terms in the series,
p
= term number
Total Recovered Charge QRR (Valid di/dt range 20 to 300A/s)
Values of kp for QRR
p
500A
1000A
2000A
3000A
4
-7.2790483×10
-7
-1.16345461×10
-6
-1.37421077×10
-6
-1.5324566×10
-6
3
5.2077175×10
-7
8.33067976×10
-4
9.8408007×10
-4
1.0972418×10
-3
2
-0.13827272
-0.22188849
-0.26287038
-0.293044667
1
21.27674696
34.8165641
42.38417424
47.25775122
0
669.4412215
991.28909752
1048.4893025
1165.616731
Recovered Charge QRA, 50% chord (Valid di/dt range 20 to 300A/s)
Values of kp for QRA
p
500A
1000A
2000A
3000A
4
-3.7814578×10
-7
-5.4862473×10
-7
-6.3898585×10
-7
-6.8739022×10
-7
3
2.7542681×10
-4
4.0216244×10
-4
4.7008097×10
-4
5.0793771×10
-4
2
-0.075394944
-0.111920413
-0.132492106
-0.144884397
1
12.50200437
20.1880681
26.18025723
30.8603883
0
320.8890665
382.338885
370.1345301
360.67474
Peak reverse recovery current IRM (Valid di/dt range 20 to 300A/s)
Values of kp for IRM
p
500A
1000A
2000A
3000A
4
-8.7116617×10
-8
-9.8322233×10
-8
-1.0380561×10
-7
-1.1523353×10
-7
3
6.4820363×10
-5
7.3315506×10
-5
7.7287542×10
-5
8.6147079×10
-5
2
-0.018819084
-0.021431025
-0.022611803
-0.025303236
1
4.491855194
5.424942762
6.016380324
6.530380888
0
40.98577734
43.80097467
43.08144722
51.33697121
Reverse recovery time tRR (Valid di/dt range 20 to 300A/s)
Values of kp for tRR
p
500A
1000A
2000A
3000A
4
4.3559656×10
-9
4.8471865×10
-9
4.8247815×10
-9
4.6950142×10
-9
3
-3.0811453×10
-6
-3.4281044×10
-6
-3.4119193×10
-6
-3.3193891×10
-6
2
7.8578776×10
-4
8.7397553×10
-4
8.6979932×10
-4
8.4584224×10
-4
1
-0.097953134
-0.108876127
-0.10835501
-0.105294524
0
11.0906485
13.30064257
14.08565971
14.61543672