Ordinary D.C. Power Supply

Ordinary D.C. Power Supply

1. An ordinary or unregulated d.c. power supply contains a rectifier and a filter circuit

   • The filter circuit removes the a.c. component so that steady d.c. voltage is obtained across the load.
     • • IMPORTANT TERMS
         • Voltage regulation
           • The d.c.voltage available across the output terminals of a given power supply depends upon load current. If the load current Idc is increased by decreasing RL, there is greater voltage drop in the power supply and hence smaller d.c. output voltage will be available.
             • • The above voltage regulation is called load regulation because it indicates the change in output voltage due to the change in load current. There is another type of voltage regulation, called line regulation and indicates the change in output voltage due to the change in input voltage.
         • Minimum load resistance
           • The change of load connected to a power supply varies the load current and hence the d.c. output voltage. In order that a power supply gives the rated output voltage and current, there is minimum load resistance allowed.

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