Technical Information Site of Power Supply Design

2015.12.06 AC/DC



In these articles concerning the basics of AC/DC conversion, we explained the following topics:


We would like the reader to understand the following points as basic items:

  • There are transformer and switching systems for providing AC/DC conversion.
  • In the AC/DC conversion process, AC is converted to DC by rectifying/smoothing.
  • In the transformer system, the smoothed out DC output can be used as is; however, if accuracy and stability are of paramount importance, the output can be subjected to a DC/DC conversion to transform it to a desired DC voltage.
  • The switching system, handling DC with a peak voltage value more or less equivalent to the AC voltage, requires high voltage tolerant parts.
  • In the switching system, conversion to DC after rectification/smoothing, is the same as the regular switching DC/DC conversion, with the exception that the input voltage is high.
  • The design of an AC/DC conversion circuit involves a transformer design process.
  • In the on-board design, the use of an AC/DC power supply IC provides several advantages.
  • Conversion circuits, subject to high voltages, require adequate protection and safety measures.

In the actual design process, the basic approach involves the question of how to select a power supply IC for AC/DC conversion and how to use it effectively. At the outset of the design process, it is important to have a firm grasp the ways in which AC/DC conversion differs from DC/DC conversion.

Basic of AC/DC Conversion

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