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A bidirectional buck-boost power converter 13 including a pair of inverter modules 14, 15 disposed at an output of a machine, and an inductor Lo connected between the pair of inverter modules 14, 15. A method for controlling a voltage output of a machine starter generator having an inverter rectifie

A bidirectional buck-boost power converter 13 including a pair of inverter modules 14, 15 disposed at an output of a machine, and an inductor Lo connected between the pair of inverter modules 14, 15. A method for controlling a voltage output of a machine starter generator having an inverter rectifier and bidirectional buck-boost converter, includes outputting a dc voltage controlled by bidirectional buck-boost pulse width modulation (PWM) switching control, when the starter generator is in a generator mode.

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1. A bidirectional buck-boost power converter comprising: a pair of bidirectional half bridge buck-boost inverter modules disposed at an output of an AC starter generator machine;solely an inductor connected between said pair of bidirectional half bridge buck-boost inverter modules, wherein the bidi

1. A bidirectional buck-boost power converter comprising: a pair of bidirectional half bridge buck-boost inverter modules disposed at an output of an AC starter generator machine;solely an inductor connected between said pair of bidirectional half bridge buck-boost inverter modules, wherein the bidirectional buck-boost power converter is devoid of energy storage capacitors that control a DC bus voltage;an inverter/rectifier connected between the output of the AC starter generator machine and said pair of half bridge buck-boost inverter modules; anda DC bus link high frequency bypass capacitor connected between the inverter/rectifier and said pair of bidirectional half bridge buck-boost inverter modules, the DC bus link high frequency bypass capacitor coupling the inverter/rectifier directly to the pair of bidirectional half bridge buck-boost inverter modules. 2. The bidirectional buck-boost power converter of claim 1, wherein each of said pair of half bridge inverter modules comprises a pair of transistors connected in series with each other, wherein each of said transistors has a diode connected in parallel thereto. 3. The bidirectional buck-boost power converter of claim 1, wherein the inverter/rectifier is configured for operation in a six-step mode, wherein at least one of the machine speed and an output of a current regulator determines an amplitude of the DC bus voltage, and wherein the inverter/rectifier switches at a frequency equal to a fundamental frequency of the machine. 4. The bidirectional buck-boost power converter of claim 1, wherein the inverter/rectifier is configured for operation in a “Pulse Amplitude Modulation” (PAM) mode, and wherein at least one of the machine speed and an output of a current regulator determines an amplitude of the DC bus voltage. 5. The bidirectional buck-boost power converter of claim 1, wherein the inverter/rectifier is configured for operation in a pulse width modulation mode with a constant DC bus voltage. 6. The bidirectional buck-boost power converter of claim 1, wherein the inverter/rectifier is configured for operation in a pulse width modulation mode with the DC bus varying as a function of at least one of the machine speed and an output of a machine current limit. 7. The bidirectional buck-boost power converter of claim 2, wherein each of said transistors comprises an insulated gate bipolar transistor (IGBT). 8. The bidirectional buck-boost power converter of claim 2, wherein each of said transistors comprises a power metal-oxide semiconductor field-effect transistor (MOSFET). 9. The bidirectional buck-boost power converter of claim 2, wherein each of said diodes comprises a high frequency diode. 10. The bidirectional buck-boost power converter of claim 1, wherein the machine is a wound field synchronous machine configured to employ field control for steady-state output voltage regulation. 11. The bidirectional buck-boost power converter of claim 1, wherein the bidirectional buck-boost power converter is configured for operation in a pulse width modulation mode to deliver a DC link voltage proportional to a machine frequency of the electric starter-generator during a starting operation. 12. The bidirectional buck-boost power converter of claim 1, wherein the inverter/rectifier is configured for operation in a six-step mode. 13. The bidirectional buck-boost power converter of claim 12, wherein the inverter/rectifier is configured for operation in the six-step mode during a starting operation of the electric starter-generator. 14. The bidirectional buck-boost power converter of claim 1, wherein the machine comprises an induction generator, wherein an inverter/rectifier is connected between an output of the induction generator and said pair of half bridge inverter modules, and wherein the inverter/rectifier is configured for operation in a six-step mode during a generating operation of the induction generator. 15. The bidirectional buck-boost power converter of claim 1, being further configured to maintain an output DC voltage within a tolerance of at least 22% and −26% during a transient operation and within at least +3.7% and −74% immediately following the transient during steady-state operation. 16. The bidirectional buck-boost power converter of claim 1, wherein the machine is configured to power at least one pulsed load, and wherein the bidirectional buck-boost power converter is further configured to maintain an output voltage within a tolerance of at least +22% and −26% during a transient operation and within at least +3.7% and −7.4% immediately following the transient during steady-state operation. 17. A bidirectional buck-boost power converter comprising: a pair of bidirectional half bridge buck-boost inverter modules disposed at an output of a wound field synchronous machine, wherein an inverter/rectifier is connected between the output of the wound field synchronous machine and said pair of bidirectional half bridge buck-boost inverter modules;solely an inductor connected between said pair of bidirectional half bridge buck- boost inverter modules; anda DC bus link high frequency bypass capacitor connected between the inverter/rectifier and said pair of bidirectional half bridge buck-boost inverter modules, the DC bus link high frequency bypass capacitor coupling the inverter/rectifier directly to the pair of bidirectional half bridge buck-boost inverter modules,wherein the wound field synchronous machine is configured to employ field control for steady-state regulation of an output voltage, and wherein the bidirectional buck-boost power converter is configured to: step up the output voltage during a transient operation, step down the output voltage during transient operations, step up the output voltage during steady state operations, and step down the output voltage during steady state operations, and further wherein the bidirectional buck-boost power converter is devoid of energy storage capacitors that control a DC bus voltage. 18. The bidirectional buck-boost power converter of claim 17, wherein the bidirectional buck-boost power converter is further configured to maintain the output voltage during load application and load removal operations. 19. A bidirectional buck-boost power converter comprising: a pair of bidirectional full-bridge buck-boost inverter modules disposed at an output of an AC starter generator machine;solely a transformer connected between said pair of bidirectional full-bridge buck-boost inverter modules, wherein the bidirectional buck-boost power converter is devoid of energy storage capacitors that control a DC bus voltage;an inverter/rectifier connected between the output of the AC starter generator machine and said air of half bridge buck-boost inverter modules; anda DC bus link high frequency bypass capacitor connected between the inverter/rectifier and said pair of bidirectional half bridge buck-boost inverter modules the DC bus link high frequency bypass capacitor coupling the inverter/rectifier directly to the pair of bidirectional half bridge buck-boost inverter modules. 20. The bidirectional buck-boost power converter of claim 16, wherein each of said pair of full-bridge inverter modules comprises a first pair of transistors connected in series with each other and a second pair of transistors connected in series with each other, wherein each of said transistors has a diode connected in parallel thereto, and said first pair of transistors is connected in parallel with said second pair of transistors. 21. The bidirectional buck-boost power converter of claim 19, wherein the inverter/rectifier is configured for operation in a six-step mode, wherein at least one of the machine speed and an output of a current regulator determining an amplitude of the DC bus voltage, and wherein the inverter/rectifier switches at a frequency equal to a fundamental frequency of the machine. 22. The bidirectional buck-boost power converter of claim 19, wherein the inverter/rectifier is configured for operation in a “Pulse Amplitude Modulation” (PAM) mode with at least one of a machine speed and an output of a current regulator determining an amplitude of the DC bus voltage. 23. The bidirectional buck-boost power converter of claim 19, wherein the inverter/rectifier is configured for operation in a pulse width modulation mode with a constant DC bus voltage. 24. The bidirectional buck-boost power converter of claim 19, wherein the inverter/rectifier is configured for operation in a pulse width modulation mode with the DC bus varying as a function of at least one of the machine speed and an output of a machine current limit. 25. The bidirectional buck-boost power converter of claim 20, wherein each of said transistors comprises an insulated gate bipolar transistor (IGBT). 26. The bidirectional buck-boost power converter of claim 20, wherein each of said transistors comprises a power metal-oxide semiconductor field-effect transistor (MOSFET). 27. The bidirectional buck-boost power converter of claim 20, wherein each of said diodes comprises a high frequency diode. 28. The bidirectional buck-boost power converter of claim 19, wherein the machine is a wound field synchronous machine configured to employ field control for steady-state output voltage regulation. 29. The bidirectional buck-boost power converter of claim 19, wherein the bidirectional buck-boost power converter is configured for operation in a pulse width modulation mode to deliver a DC link voltage proportional to a machine frequency of the electric starter-generator during a starting operation. 30. The bidirectional buck-boost power converter of claim 19, wherein the inverter/rectifier is configured for operation in a six-step mode. 31. The bidirectional buck-boost power converter of claim 30, wherein the inverter/rectifier is configured for operation in the six-step mode during a starting operation of the electric starter-generator. 32. The bidirectional buck-boost power converter of claim 19, wherein the machine comprises an induction generator, and wherein the inverter/rectifier is configured for operation in a six-step mode during a generating operation of the induction generator. 33. The bidirectional buck-boost power converter of claim 22, being further configured to maintain an output DC voltage within a tolerance of at least +22% and −26% during a transient operation and within at least +3.7% and −7.4% immediately following the transient during steady-state operation. 34. The bidirectional buck-boost power converter of claim 22, wherein the machine is configured to power at least one pulsed load, and wherein the bidirectional back-boost power converter is further configured to maintain an output voltage within a tolerance of at least +22% and −26% during a transient operation and within at least +3.7% and −7.4% immediately following the transient during steady-state operation.