System and method for limiting AC inrush current
First Claim
1. A system for limiting inrush current to a power supply comprising a transformer having a core, primary windings magnetically coupled to the core, and a plurality of secondary windings magnetically coupled to the core and connected to a plurality of power cells, the system comprising:
- first, second, and third windings, separate from the plurality of secondary windings connected to the plurality of power cells, and magnetically coupled to the core of the transformer of the power supply, the first, second, and third windings dedicated to pre-charging the power supply;
a first low-voltage contactor;
a second low-voltage contactor;
a first low-voltage impedance element connected between the first low-voltage contactor and the first winding;
a second low-voltage impedance element connected between the second low-voltage contactor and the first winding;
a third low-voltage impedance element connected between the first low-voltage contactor and the second winding; and
a fourth low-voltage impedance element connected between the second low-voltage contactor and the second winding.
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Accused Products
Abstract
A system for limiting AC inrush current to a power supply. The system comprises first, second, and third windings magnetically coupled to a core of a transformer of the power supply. The system also comprises a first low-voltage contactor and a second low-voltage contactor. The system further comprises a first low-voltage impedance element connected between the first low-voltage contactor and the first winding, a second low-voltage impedance element connected between the second low-voltage contactor and the first winding, a third low-voltage impedance element connected between the first low-voltage contactor and the second winding, and a fourth low-voltage impedance element connected between the second low-voltage contactor and the second winding.
39 Citations
20 Claims
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1. A system for limiting inrush current to a power supply comprising a transformer having a core, primary windings magnetically coupled to the core, and a plurality of secondary windings magnetically coupled to the core and connected to a plurality of power cells, the system comprising:
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first, second, and third windings, separate from the plurality of secondary windings connected to the plurality of power cells, and magnetically coupled to the core of the transformer of the power supply, the first, second, and third windings dedicated to pre-charging the power supply; a first low-voltage contactor; a second low-voltage contactor; a first low-voltage impedance element connected between the first low-voltage contactor and the first winding; a second low-voltage impedance element connected between the second low-voltage contactor and the first winding; a third low-voltage impedance element connected between the first low-voltage contactor and the second winding; and a fourth low-voltage impedance element connected between the second low-voltage contactor and the second winding. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for limiting inrush current to a power supply comprising a transformer having primary windings a plurality of secondary windings magnetically connected to a plurality of power cells, the method comprising:
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charging capacitors of the power supply with low-voltage power delivered via dedicated windings separate from the plurality of secondary winding connected to the plurality of power cells, the dedicated windings magnetically coupled to a transformer of the power supply; magnetizing the transformer with low-voltage power delivered via the dedicated windings; and applying full voltage to the power supply after the capacitors are charged and the transformer is magnetized. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification