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A system and method for converting power are disclosed. Briefly described, one embodiment comprises a first power source having a first-source positive terminal and a first-source negative terminal; a second power source having a second-source positive terminal and a second-source negative terminal

A system and method for converting power are disclosed. Briefly described, one embodiment comprises a first power source having a first-source positive terminal and a first-source negative terminal; a second power source having a second-source positive terminal and a second-source negative terminal; an output capacitor having an output-capacitor positive terminal operably coupled with the second-source positive terminal and an output-capacitor negative terminal operably coupled with the first-source negative terminal; a series electrical connection between the first-source positive terminal and the second-source negative terminal; a boost converter having a boost-converter input operably coupled with the series electrical connection and the first-source negative terminal, and a boost-converter output operably coupled with the output-capacitor positive and negative terminals; and a buck-boost converter having a buck-boost-converter input operably coupled with the series electrical connection and the second-source positive terminal, and a buck-boost-converter output operably coupled with the output-capacitor positive and negative terminals.

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The invention claimed is: 1. A system comprising: a first direct current (DC) power source having a first-source positive DC terminal and a first-source negative DC terminal; a second DC power source having a second-source positive DC terminal and a second-source negative DC terminal; an output ca

The invention claimed is: 1. A system comprising: a first direct current (DC) power source having a first-source positive DC terminal and a first-source negative DC terminal; a second DC power source having a second-source positive DC terminal and a second-source negative DC terminal; an output capacitor having an output-capacitor positive terminal operably coupled with the second-source positive DC terminal and an output-capacitor negative terminal operably coupled with the first-source negative DC terminal; a series electrical connection between the first-source positive DC terminal and the second-source negative DC terminal; a boost converter having a boost-converter DC input operably coupled with the series electrical connection and the first-source negative DC terminal, and a boost-converter DC output operably coupled with the output-capacitor positive and negative terminals; and a buck-boost converter having a buck-boost-converter DC input operably coupled with the series electrical connection and the second-source positive DC terminal, and a buck-boost-converter DC output operably coupled with the output-capacitor positive and negative terminals. 2. The system of claim 1 wherein the boost converter and the buck-boost converter share an inductor electrically connected with the series electrical connection. 3. The system of claim 1 wherein the boost converter having the boost-converter DC input operably coupled with the series electrical connection and the first-source negative DC terminal, and the boost-converter DC output operably coupled with the output-capacitor positive and negative terminals comprises: a first diode having a first-diode anode (+) and a first-diode cathode (-), the first-diode cathode (-) operably coupled with the output-capacitor positive terminal; a first switch operably coupled between the first-diode anode (+) and the first-source negative DC terminal; and an inductor operably coupled between the series electrical connection and the first-diode anode (+). 4. The system of claim 1 wherein the buck-boost converter having the buck-boost converter DC input operably coupled with the series electrical connection and the second-source positive DC terminal, and the buck-boost converter DC output operably coupled with the output-capacitor positive and negative terminals comprises: a first diode having a first-diode anode (+) and a first-diode cathode (-), the first-diode anode (+) operably coupled with the output-capacitor negative terminal; a first switch operably coupled between the first diode cathode (-) and the second-source positive DC terminal; and an inductor operably coupled between the series electrical connection and the first-diode cathode (-). 5. The system of claim 1, further comprising: a switch of the buck-boost converter operably coupled with a diode of the boost converter such that the diode of the boost converter is not forward biased when the switch of the buck-boost converter is transferring current. 6. The system of claim 1, further comprising: a switch of the boost converter operably coupled with a diode of the buck-boost converter such that the diode of the buck-boost converter is not forward biased when the switch of the boost converter is transferring current. 7. The system of claim 1, further comprising: an energy storage component connected in electrical parallel with the first DC power source. 8. The system of claim 7, further comprising: a bi-directional dc--dc converter having an input operably coupled with the first DC power source and an output operably coupled with the energy storage component. 9. The system of claim 1, further comprising: an energy storage component connected in electrical parallel with the second DC power source. 10. The system of claim 9, further comprising: a bi-directional dc--dc converter having an input operably coupled with the second DC power source and an output operably coupled with the energy storage component. 11. The system of claim 1, further comprising: a 3-phase inverter operably coupled with the output capacitor. 12. The system of claim 1 wherein the first DC power source comprises: at least one of a fuel cell, a battery, an electrolytic capacitor, and an ultra capacitor. 13. The system of claim 1 wherein the second DC power source comprises: at least one of a fuel cell, a battery, an electrolytic capacitor, and an ultra capacitor. 14. An electrical power supply to supply electrical power between a first power source, a second power source, and a load, wherein the first power source is in serial connection with the second power source the electrical power supply comprising: a boost converter coupled between the first power source and the load; and a buck-boost converter coupled between the second power source and the load, wherein the buck-boost converter is operable to provide power from the second power source to the load at a first time, and the boost converter is operable to provide power from the first power source to the load at a second time, wherein the buck-boost converter is further operable to provide power from the load to the second power source at a third time. 15. The electrical power supply of claim 14 wherein the second power source is rechargeable. 16. An electrical power supply to supply electrical power between a first power source, a second power source, and a load, wherein the first power source is in serial connection with the second power source, the electrical power supply comprising: a boost converter coupled between the first power source and the load; and a buck-boost converter coupled between the second power source and the load, wherein the buck-boost converter is operable to provide power from the second power source to the load at a first time, and the boost converter is operable to provide power from the first power source to the load at a second time; and an inverter electrically coupled between the load and the boost and the buck-boost converters. 17. The electrical power supply of claim 16 wherein the second power source is rechargeable. 18. A system for use with a first direct current (DC) power source and a second DC power source, the system comprising: a boost converter having a boost-converter-input positive DC terminal and a boost-converter-input negative DC terminal and boost-converter-output DC terminals operably coupled with an output capacitor having output-capacitor positive and negative terminals; a buck-boost converter having a buck-boost-converter-input positive DC terminal and a buck-boost-converter-input negative DC terminal and buck-boost-converter-output DC terminals operably coupled with the output-capacitor positive and negative terminals; and a series electrical connection between the boost-converter-input positive DC terminal and the buck-boost-converter-input negative DC terminal. 19. The system of claim 18 wherein the boost converter and the buck-boost converter share an inductor electrically connected with the series electrical connection. 20. The system of claim 18, further comprising: a 3-phase inverter operably coupled with the output capacitor. 21. The system of claim 20, further comprising: a 3-phase load operably coupled with the 3-phase inverter. 22. The system of claim 18 wherein the first DC power source comprises: at least one of a fuel cell, a battery, an electrolytic capacitor, and an ultra capacitor operably coupled with the buck-boost converter. 23. The system of claim 18 wherein the second DC power source comprises: at least one of a fuel cell, a battery, an electrolytic capacitor, and an ultra capacitor operably coupled with the buck-boost converter. 24. A method for use with an electrical power supply, the method comprising: coupling a first-power-source negative DC terminal with an output-capacitor negative DC terminal; coupling a first-power-source positive DC terminal with a second-power-source negative terminal; coupling a second-power-source positive DC terminal with an output-capacitor positive terminal; coupling a buck-boost converter DC input with the second-power-source negative DC terminal and the second-power-source positive DC terminal; coupling a buck-boost converter DC output with the output-capacitor positive and negative terminals; coupling a boost converter DC input with the first-power-source positive DC terminal and the first-power-source negative DC terminal; and coupling a boost converter DC output with the output-capacitor positive and negative terminals. 25. The method of claim 24, further comprising: coupling a 3-phase inverter with the output capacitor positive and negative terminals. 26. The method of claim 25, further comprising: coupling a 3-phase load with the 3-phase inverter. 27. A system comprising: a first power source node having a first-node positive terminal and a first-node negative terminal; a second power source node having a second-node positive terminal and a second-node negative terminal; an output capacitor having an output-capacitor positive terminal operably coupled with the second-node positive terminal and an output-capacitor negative terminal operably coupled with the first-node negative terminal; a series electrical connection between the first-node positive terminal and the second-node negative terminal; and an inductor electrically connected to the series electrical connection, the inductor forming a part of a boost converter and the inductor forming a part of a buck-boost converter. 28. The system of claim 27 wherein the inductor electrically connected to the series electrical connection, the inductor forming a part of a boost converter and the inductor forming a part of a buck-boost converter further comprises: a boost-converter diode and a boost-converter switch electrically connected with the inductor; a buck-boost-converter diode and a buck-boost-converter switch electrically connected with the inductor; and the boost-converter switch connected in electrical parallel with the buck-boost-converter diode such that the buck-boost-converter diode is not forward biased when the boost-converter switch is transferring current. 29. The system of claim 27, wherein the inductor electrically connected to the series electrical connection, the inductor forming a part of a boost converter and the inductor forming a part of a buck-boost converter comprises: a boost-converter diode and a boost-converter switch electrically connected with the inductor; a buck-boost-converter diode and a buck-boost-converter switch electrically connected with the inductor; and the buck-boost-converter switch connected in electrical parallel with the boost-converter diode such that the boost-converter diode is not forward biased when the buck-boost-converter switch is transferring current. 30. The system of claim 27, further comprising: a 3-phase inverter operably coupled with the output capacitor. 31. The system of claim 27 wherein the first power source node comprises: a connector configured for detachably connecting to at least one terminal of at least one of a fuel cell, a battery, an electrolytic capacitor, and an ultra capacitor. 32. The system of claim 27 wherein the second power source node comprises: a connector configured for permanently connecting to at least one terminal of at least one of a fuel cell, a battery, an electrolytic capacitor, and an ultra capacitor.