What is the difference between active and passive power supply?
he required circuit is simple, the production cost is also low, generally only about $two, mostly for the domestic DIY market.
The biggest benefit of passive PFC is EMI (electromagnetic interference) is low
Passive PFC adopts series inductance (Figure 4), which is directly connected to the AC power supply line or the 200V capacitor of the rectifier bridge and the filter.
However, the passive PFC power factor (energy conversion efficiency) is not high and heavy, prone to power frequency vibration and noise problems
