Draft Guide for Harmonic Limits for Single-Phase Equipment

Fig. 4-2 Switch-Mode dc Power Supply

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Fig. 4-2 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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