摘要:
A power factor correction controller is utilized for a power factor correction circuit in a critical conduction mode of an electric power converter. The power factor correction controller generates a control voltage according to an output voltage outputted from the electric power converter, and utilizes a first threshold value to detect the control voltage. The power factor correction controller can control the power factor correction circuit to operate in different modes according to various levels of a load. Therefore, an objective according to the present invention for reducing electric power consumption of the electric power converter in a light load or a no-load mode and improving energy transmission efficiency can be attained.