BasicB-003-017-006

Apart from efficiency, what is one advantage of a switching (switch mode) power supply over a linear power supply?

D
Answer
Basic radio theory
Type
A
Lower risk of radio frequency noise
B
Simpler to repair
C
Different simultaneous output voltages
D
Reduced physical dimensions and weight

Answer Notes

Switching power supplies use high-frequency switching circuits to regulate output voltage, whereas linear power supplies rely on large, heavy 60 Hz transformers and heat-dissipating regulators. Because they operate at much higher frequencies, switching power supplies can use significantly smaller transformers and require less heat sinking. This results in a power supply that is drastically smaller and lighter than a linear supply of the same power rating. The distractors highlight the weaknesses of switching supplies rather than their strengths. Switching supplies are generally more complex and harder to repair, and their high-frequency switching action frequently creates more radio frequency (RF) noise, not less.
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