The wikipedia article on Step up converters says

A boost converter (step-up converter) is a DC-to-DC power converter with an output voltage greater than its input voltage.

However if I look at any given step up converter it will mention that the input and output is AC. Why this discrepancy? I hope and guess it's just a terminology thing, but the concept of an AC step-up converter is something I have a lot of trouble understanding, so I would like to have my terminology right.


That link is for a Step-Up transformer. Relying on coupled magnetic flux, a transformer can only convert AC.

A Boost converter is typically a DC-DC step-up converter.

A Boost converter can be used in DC-AC conversion typically called an Inverter; where a DC voltage is Boosted to a higher DC voltage and converted to AC.

A Boost converter is also an important component in a PFC (Power Factor Correction) circuit.

  • \$\begingroup\$ That's so obvious in hindsight. For reasons that are beyond me I was reading the terms transformer and converter as synonyms despite knowing better. Especially things like how the amazon caption both mentions transformer and converter did confuse me a lot though. Thanks! \$\endgroup\$ – David Mulder Mar 24 '15 at 12:11

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