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What’s the good frequency of switching mode power supply to have good efficiency?

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  • \$\begingroup\$ If efficiency is your only goal, the lower the better. if size mass and price are also issues, you'll have to compromise. \$\endgroup\$ – Jasen May 29 '16 at 11:15
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It depends on the power level and how good is good. The power grid runs on 50/60 Hz although not switched for a reason.

GW HVDC substations switches at about 50-2000 Hz. MW traction converters for trains around 1 kHz. Multi kW-power supplies for inductrial applications around 5-10 kHz. kW level high end amplifiers and welding equipment at about 50-100 kHz. 100 W laptop chargers and the like at about 60-200 kHz. Small 10 W cell phone chargers at ~500 kHz. Integrated single-W converters inside computers and simular in the MHz region.

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