Practical test method for the sensitivity of programmable logic controller to voltage sags and short interruptions

Research on the Effects of Voltage Sags and Harmonics on the Output Characteristics of Switching Power Supply

“…[4], a switching power supply containing a twostage power factor correction circuit is simulated and analyzed with the conclusion that the higher the load of the switching power supply, the lower the output voltage. Similar to voltage sags sensitive devices such as adjustable speed drivers (ASDs) [5,6], AC contactors (ACC) [7][8][9], low-voltage disconnectors [10], PLCs [11,12] and PCs [13] that detailed tests are required to obtain the corresponding voltage tolerance curves, the test research is also required for switching power supplies to obtain the voltage tolerance curves. Among them, the voltage sag tolerance curve of the switching power supply is given through the analysis of a large amount of test data, and the effect of load capacity on the voltage sag tolerance curve of the switching power supply is also considered in Ref.…”