It is installed behind the bridge diode fro the purpose of power factor improvement and harmonic countermeasure, and it functions as part of the power supply circuit.
It is classified into a current continuous type and a current critical type due to the difference in current flowing (control method), and in general the continuous current type is for large power and the current critical type is for small/medium power.
In recent years, introduction of the interleave method has made it easier to cope with higher power consumption even in current critical types.

The diode current becomes a triangular wave and the recovery current is suppressed by the inductor.
Therefore, it is unnecessary to calculate the high speed of the diode as the continuous current type and the balance with the forward voltage drop VF is important.

• MOSFET(CoolMOS®)
• Fast recovery diode
• Bypass Diode (general rectifier diode)
• PFC current critical interleave control IC MH series