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In an AC link type boosting device, DC terminals of two voltage inverters are connected each other in series in additive polarity and plural AC terminals of each of the voltage inverters are connected to a transformer. The two voltage type inverters are AC linked to each other via the transformer. A

In an AC link type boosting device, DC terminals of two voltage inverters are connected each other in series in additive polarity and plural AC terminals of each of the voltage inverters are connected to a transformer. The two voltage type inverters are AC linked to each other via the transformer. An external voltage applied between the DC terminals of the AC link type booster is divided by the voltage-type inverters.

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1. An AC link bidirectional DC-DC converter having two voltage inverters, each of said voltage inverters using semiconductor switching elements, each of said semiconductor switching elements being formed by an IGBT and an antiparallel diode, the voltage inverters having DC terminals connected to eac

1. An AC link bidirectional DC-DC converter having two voltage inverters, each of said voltage inverters using semiconductor switching elements, each of said semiconductor switching elements being formed by an IGBT and an antiparallel diode, the voltage inverters having DC terminals connected to each other in series in additive polarity, a plurality of AC terminals of each of the voltage inverters being connected to a transformer, the two voltage inverters being AC-linked to each other through the transformer, by being configured such that, of the two voltage inverters, AC terminals of the voltage inverter on a negative DC terminal side are connected to a primary coil of the transformer and AC terminals of the voltage inverter on a positive DC terminal side are connected to a secondary coil of the transformer, that transmits and receives an electric power between an energy accumulation device and an external power supply, wherein: the energy accumulation device is connected in parallel between a positive DC terminal and a negative DC terminal of the voltage inverter on the negative DC terminal side of the AC link bidirectional DC-DC converter, andan external voltage applied between the DC terminals of the AC link bidirectional DC-DC converter is divided by the voltage inverters, said converter being used to power hybrid vehicles. 2. The AC link bidirectional DC-DC converter according to claim 1, characterized in that the voltage divided by the voltage inverters is realized by connecting a positive DC terminal of one of the voltage inverters with a negative DC terminal of the other voltage inverter. 3. The AC link bidirectional DC-DC converter according to claim 1, characterized in that a leakage inductance of the transformer is used for control of the voltage inverters. 4. The AC link bidirectional DC-DC converter according to claim 2, characterized in that a leakage inductance of the transformer is used for control of the voltage inverters. 5. The AC link bidirectional DC-DC converter according to claim 3, characterized in that the leakage inductance of the transformer is generated by adjusting a gap between a primary coil and a secondary coil of the transformer. 6. The AC link bidirectional DC-DC converter according to claim 4, characterized in that the leakage inductance of the transformer is generated by adjusting a gap between a primary coil and a secondary coil of the transformer. 7. The AC link bidirectional DC-DC converter according to claim 1, characterized in that a winding ratio of the transformer is determined according to a potential dividing ratio of the voltage inverters. 8. The AC link bidirectional DC-DC converter according to claim 2, characterized in that a winding ratio of the transformer is determined according to a potential dividing ratio of the voltage inverters. 9. The AC link bidirectional DC-DC converter according to claim 3, characterized in that a winding ratio of the transformer is determined according to a potential dividing ratio of the voltage inverters. 10. The AC link bidirectional DC-DC converter according to claim 4, characterized in that a winding ratio of the transformer is determined according to a potential dividing ratio of the voltage inverters. 11. The AC link bidirectional DC-DC converter according to claim 5, characterized in that a winding ratio of the transformer is determined according to a potential dividing ratio of the voltage inverters. 12. The AC link bidirectional DC-DC converter according to claim 6, characterized in that a winding ratio of the transformer is determined according to a potential dividing ratio of the voltage inverters. 13. The AC link bidirectional DC-DC converter according to claim 1, characterized in that control of the voltage inverters is performed by phase difference control. 14. The AC link bidirectional DC-DC converter according to claim 2, characterized in that control of the voltage inverters is performed by phase difference control. 15. The AC link bidirectional DC-DC converter according to claim 3, characterized in that control of the voltage inverters is performed by phase difference control. 16. The AC link bidirectional DC-DC converter according to claim 4, characterized in that control of the voltage inverters is performed by phase difference control. 17. The AC link bidirectional DC-DC converter according to claim 5, characterized in that control of the voltage inverters is performed by phase difference control. 18. The AC link bidirectional DC-DC converter according to claim 6, characterized in that control of the voltage inverters is performed by phase difference control. 19. The AC link bidirectional DC-DC converter according to claim 7, characterized in that control of the voltage inverters is performed by phase difference control. 20. The AC link bidirectional DC-DC converter according to claim 8, characterized in that control of the voltage inverters is performed by phase difference control. 21. The AC link bidirectional DC-DC converter according to claim 9, characterized in that control of the voltage inverters is performed by phase difference control. 22. The AC link bidirectional DC-DC converter according to claim 10, characterized in that control of the voltage inverters is performed by phase difference control. 23. The AC link bidirectional DC-DC converter according to claim 11, characterized in that control of the voltage inverters is performed by phase difference control. 24. The AC link bidirectional DC-DC converter according to claim 12, characterized in that control of the voltage inverters is performed by phase difference control. 25. The AC link bidirectional DC-DC converter according to claim 13, characterized in that the control of the voltage inverters involves frequency control. 26. The AC link bidirectional DC-DC converter according to claim 14, characterized in that the control of the voltage inverters involves frequency control. 27. The AC link bidirectional DC-DC converter according to claim 15, characterized in that the control of the voltage inverters involves frequency control. 28. The AC link bidirectional DC-DC converter according to claim 16, characterized in that the control of the voltage inverters involves frequency control. 29. The AC link bidirectional DC-DC converter according to claim 17, characterized in that the control of the voltage inverters involves frequency control. 30. The AC link bidirectional DC-DC converter according to claim 18, characterized in that the control of the voltage inverters involves frequency control. 31. The AC link bidirectional DC-DC converter according to claim 19, characterized in that the control of the voltage inverters involves frequency control. 32. The AC link bidirectional DC-DC converter according to claim 20, characterized in that the control of the voltage inverters involves frequency control. 33. The AC link bidirectional DC-DC converter according to claim 21, characterized in that the control of the voltage inverters involves frequency control. 34. The AC link bidirectional DC-DC converter according to claim 22, characterized in that the control of the voltage inverters involves frequency control. 35. The AC link bidirectional DC-DC converter according to claim 23, characterized in that the control of the voltage inverters involves frequency control. 36. The AC link bidirectional DC-DC converter according to claim 24, characterized in that the control of the voltage inverters involves frequency control. 37. A hybrid power supply system, in which a main power supply of an engine electric generator is connected in parallel via an AC link bidirectional DC-DC converter to an energy accumulation device while polarities thereof being matched, and electric power from the main power supply drives an electrically driven device composed of an inverter and a motor, the hybrid power supply system being characterized in that: the AC link bidirectional DC-DC converter has two voltage inverters, each of said voltage inverters using semiconductor switching elements, each of said semiconductor switching elements being formed by an IGBT and an antiparallel diode, the voltage inverters having DC terminals connected to each other in series in additive polarity;a plurality of AC terminals of each of the voltage inverters are connected to a transformer;the two voltage inverters are AC-linked to each other via the transformer by connecting, of the two voltage inverters, AC terminals of the voltage inverter on a negative DC terminal side to a primary coil of the transformer and by connecting AC terminals of the voltage inverter on a positive DC terminal side to a secondary coil of the transformer;the energy accumulation device is connected in parallel between a positive DC terminal and a negative DC terminal of the voltage inverter on the negative DC terminal side of the AC link bidirectional DC-DC converter; anda voltage of the main power supply applied between high voltage side DC terminals of the AC link bidirectional DC-DC converter is divided by the voltage inverters, said system being used to power hybrid vehicles. 38. The hybrid power supply system according to claim 37, characterized in that a leakage inductance of the transformer is used for control of the voltage inverters. 39. The hybrid power supply system according to claim 37, characterized in that a winding ratio of the transformer is determined according to a potential dividing ratio of the voltage inverters. 40. The hybrid power supply system according to claim 38, characterized in that a winding ratio of the transformer is determined according to a potential dividing ratio of the voltage inverters. 41. The hybrid power supply system according to claim 37, characterized in that control of the voltage inverters is performed by phase difference control. 42. The hybrid power supply system according to claim 38, characterized in that control of the voltage inverters is performed by phase difference control. 43. The hybrid power supply system according to claim 39, characterized in that control of the voltage inverters is performed by phase difference control. 44. The hybrid power supply system according to claim 40, characterized in that control of the voltage inverters is performed by phase difference control. 45. The hybrid power supply system according to claim 41, characterized in that the control of the voltage inverters involves frequency control. 46. The hybrid power supply system according to claim 42, characterized in that the control of the voltage inverters involves frequency control. 47. The hybrid power supply system according to claim 43, characterized in that the control of the voltage inverters involves frequency control. 48. The hybrid power supply system according to claim 44, characterized in that the control of the voltage inverters involves frequency control.