3 phase AC filter

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Asilver

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Hello there,

I am doing a project of power supply having dual inputs 3ph AC and 28VDC (when both inputs are available AC will be preferred) and having 8 isolated outputs (isolation b/w input and output as well as output-output isolation).

My AC input is variable form 50-318 Vrms phase-phase, 50 to 3500 Hz as voltage increases.


i require a filter for my AC input that can work for this frequency range.
 

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You need to check STD applicability.
Specifically "CE101, conducted emissions, power leads, 30 Hz to 10 kHz" is assuming a fixed frequency and can't be met by your application. It's effectively impossible to reduce harmonics (5/7, 11/13) without a kind of PFC rectifier. However CE101 only applies for some 461 E application Ranges, see table V. According to your frequency spec, harmonics also fall into CE102 range.

 

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This is a modular design, i'm using DC-DC converter modules for my system. Those modules its provide EMI protection but at the input i need a basic filter section.
 

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A basic conducted emission filter designed for 150 kHz - 30 MHz range can be used. Capacitor values must be limited according to higher fundamental frequency.
 

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