Draft Guide for Harmonic Limits for Single-Phase Equipment
Fig. 4-2 Switch-Mode dc Power Supply
Switch-Mode dc Power Supply
ig. 4-2 is a schematic of a switch-mode dc power supply. The dc voltage change is attained through dc-to-dc converter circuits which employ transistors or MOSFETS to perform the switching (on or off).
Unlike the linear power supply
, the solid-state devices do not have to
operate in their active region
, resulting in reduced power losses.
In this design
, the 60 Hz transformer
has been eliminated
, resulting in reduced weight and improved overall efficiency (in the 70-90% range). There is still a transformer (not shown),
but it is smaller
, lighter and less costly because it operates at high frequencies.
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