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• One of the important part in SMPS is the Transformer. Transformer
functions like a basic inductor.
• With a DC applied to an inductor and connected to ground through a
resistor, if the switch is turned on, the current will rise slowly through
the inductor and the resistor.
• The current ramps up and Reaches maximum and stays constant.
• When the current does not change any more, the inductor is fully
charged.
• Capacitors and inductors behave similarly but opposite. Capacitors can
hold the charge, but inductors can not. It has to be discharged. If there
is no path to discharge, it will make eddy current through the coil and
produce heat.
• The basic of Switching power supply is the effective and controlled
use of using the discharged energy.
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