Secondary winding is the output coil in a transformer that receives induced voltage from the primary winding through electromagnetic induction.
The secondary winding is a crucial component in transformers and isolation devices, consisting of insulated copper or aluminum wire wound around a magnetic core. It functions as the output circuit where electrical energy is transferred from the primary winding via electromagnetic induction, typically stepping voltage up or down according to the turns ratio. In isolation components like optocouplers with transformer isolation, it provides galvanic separation between input and output circuits while maintaining signal integrity.
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The output voltage is determined by the turns ratio between secondary and primary windings (V_out = V_in × N_secondary/N_primary) and the core's magnetic coupling efficiency.
Proper insulation prevents short circuits, maintains dielectric strength, and ensures thermal stability. Higher insulation classes allow operation at elevated temperatures without degradation.
Secondary windings only work with changing currents (AC or pulsed DC). For DC isolation, additional circuitry like switching converters is required to create alternating magnetic fields.
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