TROLLEY INTERFACING DEVICE HAVING A PRE-CHARGING UNIT
First Claim
1. A trolley interfacing device for interfacing a traction load to a voltage source, the trolley interfacing device comprising:
- a first charging unit coupled in parallel to the voltage source;
a second charging unit coupled in parallel to the traction load, wherein the second charging unit comprises at least one inductor;
a pre-charging unit coupled in parallel to the second charging unit and configured to pre-charge the first charging unit with a voltage across the at least one inductor prior to electrically coupling the first charging unit to the voltage source; and
a voltage converting unit disposed between the first charging unit and the second charging unit and configured to step down a voltage provided by the voltage source to the traction load.
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Abstract
A trolley interfacing device for interfacing a traction load to a voltage source is presented. The trolley interfacing device includes a first charging unit coupled in parallel to the voltage source. Further, the trolley interfacing device includes a second charging unit coupled in parallel to the traction load, where the second charging unit includes at least one inductor. Also, the trolley interfacing device includes a pre-charging unit coupled in parallel to the second charging unit and configured to pre-charge the first charging unit with a voltage across the at least one inductor prior to electrically coupling the first charging unit to the voltage source. In addition, the trolley interfacing device includes a voltage converting unit disposed between the first charging unit and the second charging unit and configured to step down a voltage provided by the voltage source to the traction load.
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Citations
20 Claims
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1. A trolley interfacing device for interfacing a traction load to a voltage source, the trolley interfacing device comprising:
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a first charging unit coupled in parallel to the voltage source; a second charging unit coupled in parallel to the traction load, wherein the second charging unit comprises at least one inductor; a pre-charging unit coupled in parallel to the second charging unit and configured to pre-charge the first charging unit with a voltage across the at least one inductor prior to electrically coupling the first charging unit to the voltage source; and a voltage converting unit disposed between the first charging unit and the second charging unit and configured to step down a voltage provided by the voltage source to the traction load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for interfacing a traction load to a voltage source, the method comprising:
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decoupling a first charging unit of a trolley interfacing device from the voltage source; activating a pre-charging unit of the trolley interfacing device to energize at least one inductor in a second charging unit of the trolley interfacing device; and deactivating the pre-charging unit to provide a voltage across the at least one energized inductor to the first charging unit prior to electrically coupling the first charging unit to the voltage source, wherein the first charging unit is pre-charged with the provided voltage to prevent a surge current flow from the voltage source while the first charging unit is operatively coupled to the voltage source. - View Dependent Claims (13, 14, 15)
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16. A system for driving a traction load, the system comprising:
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a voltage source configured to supply a direct current (DC) voltage to drive the traction load; a trolley interfacing device disposed between the voltage source and the traction load and configured to step down the DC voltage supplied from the voltage source to the traction load, wherein the trolley interfacing device comprises; a first charging unit coupled in parallel to the voltage source; a second charging unit coupled in parallel to the traction load, wherein the second charging unit comprises at least one inductor; a pre-charging unit coupled in parallel to the second charging unit and configured to pre-charge the first charging unit with a voltage across the at least one inductor prior to electrically coupling the first charging unit to the voltage source; and a voltage converting unit disposed between the first charging unit and the second charging unit and configured to step down a voltage provided by the voltage source to the traction load. - View Dependent Claims (17, 18, 19)
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20. A trolley interfacing kit for interfacing a traction load to a voltage source, comprising:
a pre-charging unit configured to pre-charge a first charging unit with a voltage across at least one inductor in a second charging unit prior to electrically coupling the first charging unit to the voltage source, wherein the pre-charging unit is coupled in parallel to a voltage converting unit and the second charging unit.
Specification