Power supplies
94
2.
POWER SUPPLIES
Regenerative regulated power supplies
70
DDS
HARDWARE
Ref.1310
Power derating
The following graph shows the maximum rms current in continuous S1
(Pn) and intermittent S6-40% (Pmax) duty cycles for a switching frequen-
cy of the power transistors of 8 kHz in a temperature range between 5 °C
(41 °F) and 60 °C (140 °F). See the load cycles in the next section.
Power derating graph / RPS-80
Power derating graph / RPS-75
T. H2/25 Power derating on RPS-80 power supply (8 kHz).
Tamb Pn (power in S1)
P
S6
(power in S6-40%)
in ° C in °F in kW in kW
35 95 80.0 104.0
40 104 80.0 104.0
45 113 80.0 104.0
50 122 76.6 99.5
55 131 72.0 93.6
60 140 67.3 87.5
F. H2/28
Power derating on RPS-80 power supply for fc = 8 kHz.
T. H2/26 Power derating on RPS-75 power supply (8 kHz).
Tamb Pn (power in S1) P
S6
(power in S6-40%)
in °C in °F in kW in kW
35 95 75.0 97.5
40 104 75.0 97.5
45 113 75.0 97.5
50 122 71.1 92.5
55 131 67.1 87.2
60 140 63.0 81.9
F. H2/29
Power derating on RPS-75 power supply for fc = 8 kHz.
35 40 55 60
50
P (kW)
Tambient °C (°F)
45 50
(95)
(104)
(113) (122) (131) (140)
25
75
Pn
100
P
S6
125
0
35 40 55 60
70
P (kW)
Tambient °C (°F)
45 50
(95)
(104)
(113) (122) (131) (140)
60
80
Pn
90
P
S6
100
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