Patent ID: 8437155

Claim:
A three-phase power factor correction (PFC) apparatus to operate on a three-phase power source, comprising: a rectifier to rectify the three-phase power source; a switching element which performs a power factor correction (PFC) switching operation to correct a power factor of the rectifier; a zero-crossing detector to detect a zero-crossing point of an input voltage signal received from the three-phase power source; a current detector to detect a delay of an input current signal received from the three-phase power source; and a controller which delays the PFC switching from the zero-crossing point of the input voltage signal according to the delay of the input current signal, and controls the switching element; wherein the switching element comprises an output common potential terminal and the current detector is connected to the output common potential terminal of the switching element, such that the current detector detects an erroneous current loaded on the common potential terminal during the PFC.