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If the coil has a secondary winding and a load is attached, it is called a transformer
because it transforms the energy into electrical energy and delivers it to a load.
In other words, the transformer discharges its stored energy into the secondary.
Repeating these actions again.
1. When the Switch is turned on the primary charges.
2. When the Switch is turned off, the charged core of the inductor discharges into the
secondary.
3. Since we are interested in DC output, the addition of the Diode and Capacitor at
the secondary will allow for the energy to be stored in the Capacitor. This stored
energy is our Secondary DC voltage.
4. If the switch is turned off prior to fully charging the inductor, the transferred
energy will be less. This shows that by controlling the Switch's on/off time we can
obtain necessary secondary voltage.
The Transformer, Switch or any Switching Device and a Control Circuit (to
control on/off switching) make up a Switching Supply.
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