Transcription of Using Standard Transformers in Multiple Applications
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Using Standard Transformers in Multiple Applications
Document 857-1 Revised 04/13/10 Creative Use of Alternate Winding ConnectionsUsing StandardTransformers inMultiple ApplicationsIntroductionMany Coilcraft Transformers were designed for optimalperformance in a specific application. Catalog informa-tion presents the Transformers based on the specifica-tions for that original application. However with a littlecreative thinking, most Transformers can be adapted toa variety of circuit uses just by considering differentconnections for the to ConsiderA transformer winding might be constructed of multiplewires intended to be connected in parallel. The usermight instead consider connecting those wires in seriesto increase the resulting inductance or turns ratio. Carefulconsideration of all the resulting variables should bemade before attempting alternate configurations. Thosevariables include: inductance value (L) dc resistance (DCR) rms current (Irms) temperature rise (due to current and resistance) peak / saturation current (Ipk or Isat) self resonant frequency (SRF) voltage / isolation between wires / safetyFor example, assume a coil winding, either primary orsecondary side, is made with two parallel (bifilar) (L)Inductance is proportional to the square of the turnswhen wound on the same core.
Document 857-1 Revised 04/13/10 Creative Use of Alternate Winding Connections Using Standard Transformers in Multiple Applications Introduction Many Coilcraft transformers were designed for …
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