Power factor correction circuit

摘要

A power factor correction circuit includes reactors L1 and L2 to accumulate energy of an AC power source and discharge the accumulated energy, a hybrid bridge switch having two diodes D1 and D2 and two switching elements Q1 and Q2 to switch the energy accumulation and energy discharge of the reactors from one to another, a controller 3 to conduct ON-control of the two switching elements according to currents passing through the reactors and OFF-control of the two switching elements according to currents passing through the two switching elements, and a mode changer 11 to change an operation mode of the power factor correction circuit between a discontinuous mode and a critical mode according to a voltage of the AC power source.