With more than 50 years of experience in the production of power quality products, Casoman Electric pays attention to more advanced and environmentally friendly production technology and excellent manufacturing capacity, continuously improves itself and keeps pace with the times, and ensures excellent product quality. the company's business has been successfully promoted all over the world and has become one of the leading manufacturers of power quality products in Europe. It has established strategic cooperation with four major European energy suppliers: E.ON, RWE, Baden-W ü rttemberg Energy Company (EnBW) and Sweden Great Falls Company (Vattenfall).

PFC is generally divided into "inductance compensation type" and "valley filling circuit type"

Passive PFC is generally divided into "inductance compensation type" and "valley filling circuit type (Valley Fill Circuit)"

The inductance compensation method is to increase the power factor by reducing the phase difference between the fundamental current and voltage of the AC input. The passive PFC includes silent passive PFC and non-mute passive PFC. The power factor of passive PFC can only reach 0.7-0.8, which is usually near the high voltage filter capacitor.

"Valley filling circuit" is a new type of passive power factor correction circuit, which is characterized by using the valley filling circuit behind the rectifier bridge to greatly increase the conduction angle of the rectifier tube. By filling the valley point, the input current changes from a spike pulse to a waveform close to a sine wave, the power factor is increased to about 0.9, and the total harmonic distortion is significantly reduced. Compared with the traditional inductive passive power factor correction circuit, its advantage is that the circuit is simple, the power factor compensation effect is remarkable, and the large inductor with large volume and weight does not need to be used in the input circuit.