AC link bidirectional DC-DC converter, hybrid power supply system using the same and hybrid vehicle
First Claim
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.
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Accused Products
Abstract
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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Citations
48 Claims
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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 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:
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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, and an 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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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:
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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; and a 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. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48)
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Specification
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- Resources
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Current AssigneeKomatsu Ltd.
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Original AssigneeKomatsu Ltd.
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InventorsMoki, Atsushi, Iida, Katsuji
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Primary Examiner(s)Sample, Jonathan L
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Application NumberUS12/085,151Publication NumberTime in Patent Office3,254 DaysField of SearchUS Class Current1/1CPC Class CodesB60L 2210/10 DC to DC convertersB60L 2210/20 AC to AC convertersB60L 50/60 using power supplied by bat...H02J 7/0016 using shunting, discharge o...H02J 7/345 using capacitors as storage...H02M 3/33584 Bidirectional convertersY02T 10/70 Energy storage systems for ...Y02T 10/72 Electric energy management ...
