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Mitigating undesired input beat frequencies in parallel DC-DC converter arrays - Story
February 20, 2012
When an array of switching DC-DC converters is connected in parallel for higher power output, differences in operating frequencies result in undesired beat frequencies at the common input bus. The result is an unwanted increase in AC ripple currents circulating in the input sections of the converters. By using simple input filtering, the AC input ripple current can be significantly curtailed. DC-DC converters with higher fundamental switching frequencies (>1 MHz) permit the use of smaller filtering components, suiting systems where overall space and weight are at a premium.
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