and the computer ups power supply factor is not only the current phase

1) and the computer ups power supply factor is not only the current phase b (fundamental) and the voltage between the relevant and related to the current pulse width, even if the current (fundamental) and the voltage phase  difference between the b = 0, i.e., the current (base when the center line coincides with the wave), and the voltage based on the calculated F (a) still is not 1, and the pulse width becomes narrower as the current increases.
2) Due to the forefront of the current pulse is relatively steep, so the harmonic frequency of the current offer relatively high and rich, space launch 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.