Only the power factor and the phase difference between current and voltage related to ρ

B only with the power factor phase current (fundamental) and voltage, but also to the pulse width relating to the current, even if the pure sine wave online ups  current (fundamental) and the voltage phase difference between the b = 0, i.e., the current (fundamental) and the center line coincides with the voltage based on the calculated F (a) still is not 1, and with the current pulse width is narrowed due to decrease relatively Online ups  steep leading edge of the current pulse, so that the harmonic frequency of the current is relatively high offering rich , space launch ups solar power capability to offer relatively strong. 

If the UPS input circuit is a diode rectifier or a thyristor rectifier, the power factor thereof is not caused by a phase difference, but by strong interference caused by a current pulse. These high-order harmonic currents all the way to form a series mode interference Shao fleeing through electrical equipment, another way out in the form of electromagnetic radiation, the formation of RF interference nearby devices, especially so that the radio communication can not be normal.