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An apparatus for transferring energy using onboard power electronics with high-frequency transformer isolation includes a power electronic drive circuit comprises a dc bus and a first energy storage device coupled to the dc bus. A first bi-directional dc-to-ac voltage inverter is coupled to the firs

An apparatus for transferring energy using onboard power electronics with high-frequency transformer isolation includes a power electronic drive circuit comprises a dc bus and a first energy storage device coupled to the dc bus. A first bi-directional dc-to-ac voltage inverter is coupled to the first energy storage device and to the dc bus, and a first electromechanical device coupled to the first bi-directional dc-to-ac voltage inverter. A charging system coupled to the dc bus via a charge bus comprises a receptacle configured to mate with a connector coupled to a voltage source external to the power electronic drive circuit and an isolation transformer configured to electrically isolate the charge bus from the receptacle. A controller configured to cause the charging system to supply a charging voltage to the dc bus based on a voltage received from the voltage source external to the power electronic drive circuit.

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1. A power electronic drive circuit comprising: a dc bus;a first energy storage device coupled to the dc bus, the first energy storage device configured to output a dc voltage;a first bi-directional dc-to-ac voltage inverter coupled to the first energy storage device and to the dc bus;a first electr

1. A power electronic drive circuit comprising: a dc bus;a first energy storage device coupled to the dc bus, the first energy storage device configured to output a dc voltage;a first bi-directional dc-to-ac voltage inverter coupled to the first energy storage device and to the dc bus;a first electromechanical device coupled to the first bi-directional dc-to-ac voltage inverter;a charging system coupled to the dc bus via a charge bus, the charging system comprising: a receptacle configured to mate with a connector coupled to a voltage source external to the power electronic drive circuit; andan isolation transformer configured to electrically isolate the charge bus from the receptacle;a controller configured to cause the charging system to supply a charging voltage to the dc bus based on a voltage received from the voltage source external to the power electronic drive circuit; andone or more bi-directional dc-to-dc voltage converters coupled to the dc bus;wherein the controller is further configured to cause one of the first bi-directional dc-to-ac inverter and the one or more bi-directional dc-to-dc voltage converters to: buck the charging voltage to a second charging voltage and supply the second charging voltage to the dc bus, when a voltage of the charge bus is above a voltage of the dc bus; andboost the charging voltage to a third charging voltage and supply the third charging voltage to the dc bus, when the voltage of the charge bus is below the voltage of the dc bus; andwherein, upon boosting the charging voltage, the controller is further configured to cause a first bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc voltage converters to buck the third charging voltage to a fourth charging voltage and supply the fourth charging voltage to the first energy storage device. 2. The power electronic drive circuit of claim 1 wherein the charging system further comprises: a pair of transistors; anda resonance capacitor; andwherein the isolation transformer, the pair of transistors, and the resonance capacitor form an isolation ac-to-dc inverter. 3. The power electronic drive circuit of claim 2 wherein the controller is further configured to cause the isolation ac-to-dc inverter to operate in a series resonance mode. 4. The power electronic drive circuit of claim 2 wherein the controller is further configured to cause the isolation ac-to-dc inverter to operate in one of a parallel resonance mode and a series-parallel resonance mode. 5. The power electronic drive circuit of claim 2 wherein the charging system further comprises a full-wave rectifier, wherein the isolation ac-to-dc inverter and the full-wave rectifier form an isolation dc-to-dc converter. 6. The power electronic drive circuit of claim 1 wherein the controller is further configured to cause the first bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc voltage converters to: boost a storage voltage from the first energy storage device; andsupply the boosted storage voltage to the dc bus. 7. The power electronic drive circuit of claim 6 wherein the controller is further configured to cause the first bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc voltage converters to: buck a first dc voltage on the dc bus to a second dc voltage suitable for charging the first energy storage device; andsupply the second dc voltage to the first energy storage device. 8. The power electronic drive circuit of claim 7 wherein the first electromechanical device is configured to supply an ac regenerative voltage to the first bi-directional dc-to-ac voltage inverter; and wherein the first bi-directional dc-to-ac voltage inverter is configured to invert the ac regenerative voltage into the first dc voltage and supply the first dc voltage to the dc bus. 9. The power electronic drive circuit of claim 7 further comprising: a second bi-directional dc-to-ac voltage inverter coupled to the dc bus; anda second electromechanical device coupled to the second bi-directional dc-to-ac voltage inverter. 10. The power electronic drive circuit of claim 7 wherein the controller is further configured to cause a second bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc voltage converters to: boost a storage voltage from the first energy storage device;supply the boosted storage voltage to the dc bus;boost a charging voltage from the charging system;supply the boosted charging voltage to the dc bus. 11. The power electronic drive circuit of claim 7 further comprising: a second bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc voltage converters comprising a pair of diodes coupled between a first conductor and a second conductor of the dc bus;a third bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc voltage converters comprising a pair of diodes coupled between the first and second conductors of the dc bus;wherein the pairs of diodes of the second and third bi-directional dc-to-dc voltage converters of the one or more bi-directional dc-to-dc voltage converters are configured to rectify an ac voltage supplied by the charge bus into a fully-rectified dc voltage; andwherein the controller is further configured to cause the second and third bi-directional dc-to-dc voltage converters of the one or more bi-directional dc-to-dc voltage converters to: boost a storage voltage from the first energy storage device;supply the boosted storage voltage to the dc bus. 12. The power electronic drive circuit of claim 1 further comprising a second energy storage device coupled between the pair of conductors of the dc bus, wherein the second energy storage device has a higher voltage then the first energy storage device. 13. The power electronic drive circuit of claim 1 wherein the first electromechanical device comprises one of a traction motor and an alternator. 14. A method of manufacturing a power electronic drive circuit comprising: coupling a first dc energy storage device to a dc bus;coupling a first bi-directional dc-to-ac voltage inverter to the dc bus;coupling a first electromechanical device to the first bi-directional dc-to-ac voltage inverter, the first electromechanical device configured to convert mechanical energy into electrical energy and configured to convert electrical energy into mechanical energy;coupling one or more bi-directional dc-to-dc voltage converters to the dc bus; andcoupling a charging circuit to the dc bus via a charge bus, the charging system comprising: a receptacle configured to mate with an external voltage source connector; anda transformer configured to electrically isolate the charge bus from the receptacle;configuring a controller to cause the charging system to supply a charging voltage to the dc bus based on a voltage received from the external voltage source; andconfiguring the controller to cause one of the first bi-directional dc-to-ac voltage inverter and the one or more bi-directional dc-to-dc voltage converters to: buck the charging voltage to a second charging voltage and supply the second charging voltage to the dc bus, when a voltage of the charge bus is above the voltage of the dc bus; andboost the charging voltage to a third charging voltage and supply the third charging voltage to the dc bus, when the voltage of the charge bus is below the voltage of the dc bus;wherein the voltage of the dc bus is greater than that of the first energy storage device. 15. The method of claim 14 wherein coupling the charging circuit to the dc bus comprises coupling a series resonant inverter to the charge bus, the series resonant inverter comprising: a pair of switches coupled to the controller;a resonant capacitor; andthe transformer. 16. The method of claim 14 further comprising: coupling a first bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc voltage converters to the dc bus; andconfiguring the controller to cause the first bi-directional dc-to-dc voltage converter to buck the voltage of the dc bus to a lower voltage suitable for charging the first dc energy storage device. 17. The method of claim 14 further comprising: coupling a second bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc converters to the dc bus, the second bi-directional dc-to-dc voltage converter comprising a first pair of diodes coupled to the dc bus;coupling a third bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc converters to the dc bus, the third bi-directional dc-to-dc voltage converter comprising a second pair of diodes coupled to the dc bus; andwherein coupling the charging circuit to the dc bus via the charge bus comprises coupling the charge bus to the first and second pair of diodes. 18. The method of claim 14 wherein the receptacle is configured to mate with the external voltage source connector of one of an external ac voltage source and an external dc voltage source. 19. A system comprising: a machine configured to convert mechanical energy into electrical energy and configured to convert electrical energy into mechanical energy;a voltage inverter coupled to the machine and configured to convert ac electrical energy into dc electrical energy and to convert dc electrical energy into ac electrical energy;a dc bus coupled to the voltage inverter;a first energy storage device coupled to the dc bus;a charging system comprising: a receptacle configured to mate with a plug coupled to a voltage source external to the power electronic drive circuit;a full-wave rectifier coupled to the receptacle and configured to rectify a voltage received from the voltage source;a dc-to-dc converter coupled to the full-wave rectifier; the dc-to-dc converter comprising an isolation transformer configured to electrically isolate a charge bus from the full-wave rectifier; andthe charge bus coupled to the dc-to-dc converter and to the dc bus; and a controller configured to cause the dc-to-dc converter to: convert a first dc voltage received from the full-wave rectifier to a second dc voltage; andsupply the second dc voltage to the charge bus; andone or more bi-directional dc-to-dc voltage converters coupled to the dc bus; andwherein the controller is further configured to cause one of the voltage inverter and the one or more bi-directional dc-to-dc voltage converters coupled to the dc bus to: buck the second dc voltage to a third dc voltage and supply the third dc voltage to the dc bus, when a voltage of the charge bus is above a voltage of the dc bus; andboost the second dc voltage to a fourth dc voltage and supply the fourth dc voltage to the dc bus, when a voltage of the charge bus is below a voltage of the dc bus;wherein the voltage of the dc bus is greater than that of the first energy storage device. 20. A power electronic drive circuit comprising: a dc bus;a first energy storage device coupled to the dc bus, the first energy storage device configured to output a dc voltage;a first bi-directional dc-to-ac voltage inverter coupled to the first energy storage device and to the dc bus;a first electromechanical device coupled to the first bi-directional dc-to-ac voltage inverter;a charging system coupled to the dc bus via a charge bus, the charging system comprising: a receptacle configured to mate with a connector coupled to a voltage source external to the power electronic drive circuit for generating a first dc voltage; andan isolation transformer configured to electrically isolate the charge bus from the receptacle; andwherein the first bi-directional dc-to-ac voltage inverter includes rectifying elements for generating a second dc voltage;a controller configured to cause the charging system to supply a charging voltage to the dc bus based on the first dc voltage received from the voltage source external to the power electronic drive circuit or the second dc voltage received from the rectifying elements of the first bi-directional dc-to-ac voltage inverter; andone or more bi-directional dc-to-dc voltage converters coupled to the dc bus;wherein the controller is further configured to cause the one or more bi-directional dc-to-dc converters to: buck the charging voltage to a lower charging voltage and supply the lower charging voltage to the dc bus, when a voltage of the charge bus is above a voltage of the dc bus; andboost the charging voltage to a higher charging voltage and supply the higher charging voltage to the dc bus, when a voltage of the charge bus is below a voltage of the dc bus; andwherein, the voltage of the dc bus is greater than that of the first energy storage device. 21. The power electronic drive circuit of claim 20 wherein the charging system further comprises: a pair of transistors; anda resonance capacitor; andwherein the isolation transformer, the pair of transistors, and the resonance capacitor form an isolation ac-to-dc inverter. 22. The power electronic drive circuit of claim 20 wherein the controller is further configured to cause a first bi-directional dc-to-dc voltage converter of the one or more bi-directional dc-to-dc voltage converters to: boost a storage voltage from the first energy storage device; andsupply the boosted voltage to the dc bus. 23. The power electronic drive circuit of claim 20 further comprising a second energy storage device coupled to the dc bus, wherein the voltage of the second energy storage device is greater than that of the first energy storage device.