![]() ![]() Nevertheless, an average voltage across a real coil's terminals can be non-zero due to non-zero wire resistance. ![]() DC output voltage can be obtained only by using rectifiers. Note that it can't transfer a DC component of a pulse: in a steady state mode net volt-seconds across any winding should be zero, otherwise the core will soon saturate. Power transformer in SMPS is used to change amplitude of high-frequency pulses by the turns ratio and to provide isolation between circuits. This in turn induces alternating voltage (electromotive force, or emf) in each of the secondary coil according to Faraday's law. The core multiplies this field and couples most of the flux through the secondary windings. A changing current in the primary winding creates an alternating magnetic field in the core. ![]()
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