AC INRUSH CURRENT TESTING DEVICE AND METHOD FOR TESTING AC INRUSH CURRENT

摘要

An AC inrush current testing device is disclosure. The AC inrush current testing device includes a grid voltage peak point calculator, a grid voltage period and timing detector, a switch, an autotransformer, and a main relay. The grid voltage period and timing detector is connected to an AC power source and the grid voltage peak point calculator. A movable contact of the switch is connected to the AC power source. A first winding of the autotransformer is connected to the AC power source, a second winding of the autotransformer, and a first stationary contact of the switch. A third winding of the autotransformer is connected to a second stationary contact of the switch and the second winding. The main relay is electrically connected to the grid voltage peak point calculator, the second winding, and the third winding. A method for testing AC inrush current is further disclosed.

主权项

1. An alternative current (AC) inrush current testing device arranged between an AC power source and a power supply unit and electrically connected to the AC power source and power supply unit, the AC inrush current testing device comprising:
a grid voltage peak point calculator; a grid voltage period and timing detector electrically connected to the AC power source and the grid voltage peak point calculator; a switch having a movable contact, a first stationary contact, and a second stationary contact, wherein the movable contact is electrically connected to the AC power source; an autotransformer comprising a first winding, a second winding, and a third winding, wherein one terminal of the first winding is electrically connected to the AC power source, and the other terminal of the first winding is electrically connected to the first stationary contact and one terminal of the second winding, one terminal of the third winding is electrically connected to the second stationary contact, and the other terminal of the third winding is electrically connected to the other terminal of the second winding; and a main relay electrically connected to the power supply unit, the grid voltage peak point calculator, the second winding, and the third winding, wherein the grid voltage period and timing detector detects a potential level of an AC voltage signal outputted from the AC power source and outputs a test signal having zero cross point to the grid voltage peak point calculator, the grid voltage peak point calculator calculates a period of the test signal and sends a trigger signal to the switch at a specific time of the following period for turning on the switch, thus the AC voltage signal is conduct to the power supply unit.