power factor (pf) meaning in English

功率因数

The power factor ( pf ) is the ratio of average power to apparent power
功率因数是有功功率与视在功率之比。
Active pfc techniques have been researched systematically and used widely in the recent twenty years because of high power factor ( pf ) and low total harmonic distortion ( thd )
有源pfc技术具有功率因数高和总谐波含量小等优点,在过去的二十年里,得到了长足的发展和广泛应用。
The input of traditional ac - dc converter is diode - capacitance combined circuit . it ? input current wave presents pulse shape , and the power factor ( pf ) on ac line side is low
传统的ac ? dc开关变换器输入端是二极管整流-滤波电容组合电路，其输入电流波形呈脉冲状，交流网侧功率因数很低。
With the development of power electronics , switching mode power supply ( smps ) must have higher frequency , higher power density , higher efficiency , higher power factor ( pf ) and higher reliability . to be practicability , the circuit must be simple and small
随着电力电子技术的不断发展，要求开关电源有更高的频率、更高的功率密度、更高的效率、更高的功率因数和更高的可靠性，同时还要求其电路相对简洁，并有较小的体积，这样才更具实用性。