Power factor
Passive PFC
#### Passive PFC

The simplest way to control the [harmonic](/wiki/Harmonics_%28electrical_power%29 "Harmonics (electrical power)") current is to use a [filter](/wiki/Electronic_filter "Electronic filter") that passes current only at [line frequency](/wiki/Utility_frequency "Utility frequency") (50 or 60 Hz). The filter consists of capacitors or inductors and makes a non\-linear device look more like a [linear](/wiki/Linear "Linear") load. An example of passive PFC is a [valley\-fill circuit](/wiki/Valley-fill_circuit "Valley-fill circuit").

A disadvantage of passive PFC is that it requires larger inductors or capacitors than an equivalent power active PFC circuit. Also, in practice, passive PFC is often less effective at improving the power factor.


What is an example of passive PFC?