Transcription of Section 4 – Power Transformer Design - TI.com
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Section 4 – Power Transformer Design - TI.com
4-1 Section 4 Power Transformer DesignPower Transformer DesignThis Section covers the Design of Power trans-formers used in buck-derived topologies: forwardconverter, bridge, half-bridge, and full-wave center-tap. Flyback transformers (actually coupled induc-tors) are covered in a later Section . For more spe-cialized applications, the principles discussed hereinwill generally of a TransformerThe purpose of a Power Transformer in Switch-Mode Power Supplies is to transfer Power efficientlyand instantaneously from an external electrical sourceto an external load. In doing so, the Transformer alsoprovides important additional capabilities: The primary to secondary turns ratio can be es-tablished to efficiently accommodate widely dif-ferent input/output voltage levels.
The above allocations can be impossible to achieve because the number of turns in each winding must be an integral number. In a low voltage secon-dary, 1.5 turns may be required for optimum balance between core and winding losses. With one turn, the flux swing and core loss may be much too large; with two turns the winding loss becomes too great.
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