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3 Electrical connection
3.3.6 Calculation of the EMI filter current
Example
34
maximum load power consumption + P
I
= I
=
Mains
Filter
Voltage supply for power section
A 3000 W heating rod is to be operated at 90 V and 33.3 A with a power con-
troller type 709051/X-XX-070... in a 230 V mains supply. This results in the fol-
lowing application power loss according to the formula:
P
is taken from the table on power loss in Chapter 2.3 "Environmental
Loss max
influences" and amounts to (for our application with connection to 230 V):
450 W.
3000 W (heating load) +
I
=
Mains
230 V (voltage supply to the power section)
I
=
14 A
Mains
With a mains current of 14 A, an EMI filter with a nominal current of 16 A is
used.
33.3 A
P
= 450 W ×
Loss
70
P
=
214 W
Loss
214 W
V1.00/EN/00741192/2021-03-30 [IPC 300]
Loss
A
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