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US 2006/0133119 A1Published application
Electric power unit
AssigneeKabushiki Kaisha Toshiba
InventorsFujio Nomura, Hiroshi Iwanaga, Masayasu Doi
Life of this patent
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Abstract
There is no period of time when any of switching elements and switching elements is turned on in a certain switching frequency, any one switching element is turned on in a period of time except for a dead time period for the zero voltage switching, the switching elements and the switching elements are turned on and off while shifting the phases by 180 degrees, and switching elements are turned on during a period of time when the currents in a positive direction and an inverse direction are flowing to the output, respectively, to be operated in a discontinuous current mode.
Claims10
An electric power unit comprising:
- a first switching element having one end to which one level of a direct current voltage is applied;
- a second switching element having one end connected to the other end of the first switching element and having the other end to which the other level of the direct current voltage is applied;
- a third switching element having one end to which one level of the direct current voltage is applied;
- a fourth switching element having one end connected to the other end of the third switching element and having the other end connected to the other end of the second switching element, the other level of the direct current being applied to the other end;
- a first capacitor connected to any one of the first and second switching elements in parallel;
- a second capacitor connected to any one of the third and fourth switching elements in parallel in accordance with the first capacitor;
- a first coil having one end connected to a connection point of the first and second switching elements;
- a transformer having a primary coil connected between the other end of the first coil and the connection point of the third and fourth switching elements;
- fifth and sixth switching elements connected in series between the both ends of a secondary coil of the transformer;
- a third capacitor connected between a middle tap point of the secondary coil of the transformer and the connection point of the fifth and sixth switching elements;
- and
- a control section which controls the first to sixth switching elements on the basis of the output voltage between the both ends of the third capacitor, wherein there is no period of time when any of the first and second switching elements and the third and fourth switching elements is turned on in a certain switching frequency, any one switching element is turned on in a period of time except for a dead time period for the zero voltage switching, the first and third switching elements and the second and fourth switching elements are turned on and off while shifting the phases by 180 degrees, and the fifth and sixth switching elements are turned on during a period of time when the currents in a positive direction and an inverse direction are flowing to the output, respectively, and to be operated in a discontinuous current mode.
9 more elements
An electric power unit comprising:
- first and second DC-DC converters connected in parallel, each having:
- a first switching element having one end to which one level of a direct current voltage is applied;
- a second switching element having one end connected to the other end of the first switching element and having the other end to which the other level of the direct current voltage is applied;
- a third switching element having one end to which one level of the direct current voltage is applied;
- a fourth switching element having one end connected to the other end of the third switching element and having the other end connected to the other end of the second switching element, the other level of the direct current being applied to the other end;
- a first capacitor connected to any one of the first and second switching elements in parallel;
- a second capacitor connected to any one of the third and fourth switching elements in parallel in accordance with the first capacitor;
- a first coil having one end connected to a connection point of the first and second switching elements;
- a transformer having a primary coil connected between the other end of the first coil and the connection point of the third and fourth switching elements;
- fifth and sixth switching elements connected in series between the both ends of the secondary coil of the transformer;
- and a third capacitor connected between a middle tap point of the secondary coil of the transformer and a connection point of the fifth and sixth switching elements;
- and
- a control section which controls the first to sixth switching elements owned by the first and second DC-DC converters on the basis of the multiphased output voltages of the first and second DC-DC converters, wherein there is no period of time when any of the first and second switching elements and the third and fourth switching elements is turned on in a certain switching frequency, any one switching element is turned on in a period of time except for a dead time period for the zero voltage switching, the first and third switching elements and the second and fourth switching elements are turned on and off while shifting the phases by 180 degrees, and the fifth and sixth switching elements are turned on during a period of time when the currents in a positive direction and an inverse direction are flowing to the output, respectively, to be operated in a discontinuous current mode, and further, the control section shifts the phases of the signals for on and off control of the first to sixth switching elements by 90 degrees between the first and second DC-DC converters.
10 more elements
Dependencies are inferred from the claim text.