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An apparatus includes an energy storage device, a bi-directional DC-to-DC voltage converter coupled to the energy storage device, and an input device. A voltage bus is coupled to the bi-directional DC-to-DC voltage converter and to the input device. The apparatus also includes a controller configure

An apparatus includes an energy storage device, a bi-directional DC-to-DC voltage converter coupled to the energy storage device, and an input device. A voltage bus is coupled to the bi-directional DC-to-DC voltage converter and to the input device. The apparatus also includes a controller configured to control the bi-directional DC-to-DC voltage converter to convert a charging energy on the voltage bus into a charging energy suitable for charging the energy storage device during a charging operation and to monitor a voltage of the energy storage device during the charging operation. The controller is also configured to control the bi-directional DC-to-DC voltage converter to convert the charging energy into a charging energy configured to maintain the voltage of the energy storage device at a pre-determined value.

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1. An apparatus comprising: an energy storage device configured to supply electrical energy;a first bi-directional DC-to-DC voltage converter coupled to the energy storage device;a first input device configured to receive electrical energy from a first external energy source;a voltage bus coupled to

1. An apparatus comprising: an energy storage device configured to supply electrical energy;a first bi-directional DC-to-DC voltage converter coupled to the energy storage device;a first input device configured to receive electrical energy from a first external energy source;a voltage bus coupled to the first bi-directional DC-to-DC voltage converter and to the first input device;a voltage inverter coupled to the voltage bus and configured to convert a voltage on the voltage bus that is supplied by the energy storage device and the first bi-directional DC-to-DC voltage converter into an AC voltage suitable for driving an electromechanical device; anda controller configured to: control the first bi-directional DC-to-DC voltage converter to convert a first charging energy on the voltage bus into a second charging energy suitable for charging the energy storage device during a charging operation;monitor a voltage of the energy storage device during the charging operation; andcontrol the first bi-directional DC-to-DC voltage converter to convert the first charging energy into a third charging energy configured to maintain the voltage of the energy storage device at a pre-determined value. 2. The apparatus of claim 1 further comprising a first switch configured to couple a conductor of the first input device directly to the voltage bus. 3. The apparatus of claim 2 wherein the controller is further configured to operate the first switch to couple the conductor of the first input device directly to the voltage bus and to de-couple the conductor of the first input device from the voltage bus. 4. The apparatus of claim 3 further comprising a plurality of bi-directional DC-to-DC voltage converters comprising the first bi-directional DC-to-DC voltage converter, and wherein the controller is further configured to control the plurality of bi-directional DC-to-DC voltage converters in a parallel mode to convert a first charging energy on the voltage bus into a second charging energy suitable for charging the energy storage device during a charging operation. 5. The apparatus of claim 2 wherein the first input device is configured to receive electrical energy from a third rail of a rail system. 6. The apparatus of claim 1 further comprising a second input device coupled to the voltage bus, the second input device configured to receive electrical energy from a second external energy source. 7. The apparatus of claim 6 wherein the second input device is coupleable to the voltage bus via the voltage inverter. 8. The apparatus of claim 7 wherein the second input device is configured to receive an AC voltage, and wherein the voltage inverter is configured to rectify the AC voltage into a DC voltage and to supply the DC voltage to the voltage bus. 9. The apparatus of claim 1 wherein the energy storage device is a low-voltage energy storage device and further comprising a high-voltage energy storage device coupled to the voltage bus, and wherein the controller is further configured to control the first bi-directional DC-to-DC voltage converter to convert a first voltage from the low-voltage energy storage device into a second voltage suitable for charging the high-voltage energy storage device. 10. The apparatus of claim 9 wherein the high-voltage energy storage device comprises one of a battery, a flywheel system, and an ultracapacitor. 11. The apparatus of claim 1 wherein the energy storage device is a low-voltage energy storage device and further comprising a high-voltage energy storage device coupled to the voltage bus, and wherein the controller is further configured to control the voltage inverter and the first bi-directional DC-to-DC voltage converter simultaneously to charge the low-voltage and high-voltage energy storage devices. 12. The apparatus of claim 1 wherein the controller, in being configured to control the first bi-directional DC-to-DC voltage converter to convert the first charging energy on the voltage bus into the second charging energy, is configured to buck a voltage of the first charging energy to a voltage of the second charging energy. 13. The apparatus of claim 1 further comprising the electromechanical device, wherein the electromechanical device is configured to operate one of a vehicle, a crane, an elevator, and a lift. 14. The apparatus of claim 1 wherein the energy storage device comprises one of a battery, a fuel cell, and an ultracapacitor. 15. A method of manufacturing comprising: providing a first energy storage device;coupling a first bi-directional buck/boost converter to the first energy storage device;coupling a voltage bus to the first bi-directional buck/boost converter;coupling a voltage inverter to the voltage bus and configuring the voltage inverter to convert a voltage on the voltage bus supplied by the first energy storage device and the first bi-directional buck/boost converter into an AC voltage suitable for driving an electromechanical device;coupling a first connector to the voltage bus, the connector configured to receive electrical energy from a first external energy source; andconfiguring a controller to: cause the first bi-directional buck/boost converter to convert a first charging energy on the voltage bus into a second charging energy suitable for charging the first energy storage device during a charging operation;monitor a voltage of the first energy storage device during the charging operation; andcause the first bi-directional DC-to-DC voltage converter to convert the first charging energy into a third charging energy configured to maintain the voltage of the first energy storage device at a pre-determined value. 16. The method of manufacturing of claim 15 further comprising: coupling a second bi-directional buck/boost converter to the first energy storage device and to the voltage bus; andconfiguring the controller to cause the first and second bi-directional buck/boost converters to convert the first charging energy on the voltage bus into the second charging energy suitable for charging the first energy storage device in parallel during the charging operation. 17. The method of manufacturing of claim 15 further comprising: coupling a contactor between the voltage bus and a conductor of the first connector; andconfiguring the controller to couple the conductor of the first connector directly to the voltage bus during the charging operation. 18. The method of manufacturing of claim 17 wherein configuring the controller to couple the conductor of the first connector directly to the voltage bus during the charging operation comprises configuring the controller to couple charging energy directly to the voltage bus during the charging operation from a third rail coupled to the conductor of the first connector. 19. The method of manufacturing of claim 18 wherein configuring the controller to couple the conductor of the first connector directly to the voltage bus during the charging operation comprises configuring the controller to couple charging energy directly to the voltage bus during the charging operation from a transformer coupled to a utility grid and coupled to the conductor of the first connector. 20. A system comprising: a charge bus configured to receive charging energy from a voltage source external to the system;a connector coupled to the charge bus and configured to transfer the charging energy from the voltage source to the charge bus;a voltage inverter coupled to the charge bus;an energy storage device configured to output a DC voltage;a bi-directional voltage converter coupled between the charge bus and the energy storage device and configured to charge the energy storage device via conversion of a voltage on the voltage bus during a charging operation; anda controller configured to: monitor a transfer of the charging energy supplied to the energy storage device during the charging operation; andcontrol the bi-directional voltage converter to modify a current supplied to the energy storage device after the monitored transfer of the charging energy has crossed a threshold. 21. The system of claim 20 further comprising a plurality of bi-directional voltage converters, and wherein the controller is further configured to control each bi-directional voltage converter in parallel with each other during the charging operation. 22. The system of claim 20 further comprising a motor, and wherein the controller is further configured to control the bi-directional voltage converter and the voltage inverter to modify energy from the energy storage device to drive the motor.