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公开(公告)号：US11312241B2
公开(公告)日：2022-04-26
申请号：US17049506
申请日：2019-04-18
发明人： Tsunehito Fujita , Yuki Shirasawa
摘要： According to an embodiment, a power supply system for an electric motor car includes a first terminal, a second terminal, and a conversion unit. The first terminal is electrically connected to one of a power storage device and an overhead wire provided within a formation of electric motor cars. The second terminal is electrically connected to a lead wire together with a plurality of electric motors within the formation, a host power supply device, an external power supply device different from the host power supply device. The conversion unit receives first electric power supplied from the plurality of electric motors and the external power supply device via the second terminal and causes a direct current (DC) voltage to be generated at the first terminal according to a regenerative operation of the conversion unit to charge the power storage device in a first operation state and receives second electric power supplied from one of the power storage device and the overhead wire via the first terminal, converts a part of the second electric power into third electric power according to a powered operation of the conversion unit, and outputs the third electric power from the second terminal in a second operation state, thereby converting electric power.
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公开(公告)号：US10538162B2
公开(公告)日：2020-01-21
申请号：US15624267
申请日：2017-06-15
发明人： Takafumi Fukushima , Shigekazu Okada , Kotaro Oda , Yasuomi Maki , Tsunehito Fujita , Hiroaki Otani , Kenichi Kikkawa , Manato Mori
IPC分类号： B60L1/00 , H02J4/00 , H02J9/00 , H02M7/219 , H02M1/32 , H02M7/12 , B60L9/00 , H02J7/34 , B60L53/24 , H02P27/06 , H02M1/00
摘要： A power conversion system includes an AC to DC conversion circuit, a voltage detector, a step-down chopper circuit, a power conversion device for auxiliary power sources, and a control unit. The AC to DC conversion circuit converts AC power supplied from overhead wires via a transformer into DC power. The voltage detector detects a voltage of AC power supplied from the transformer. The step-down chopper circuit steps down the voltage of DC power produced through conversion by the AC to DC conversion circuit. The power conversion device for auxiliary power sources converts the DC power stepped down by the step-down chopper circuit into power for driving loads mounted in an electric vehicle and supplies it to the loads. The control unit controls the AC to DC conversion circuit and the step-down chopper circuit such that the voltage of AC power detected by the voltage detector approaches a reference voltage.
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公开(公告)号：US10525838B2
公开(公告)日：2020-01-07
申请号：US15623818
申请日：2017-06-15
发明人： Kenji Sato , Masayuki Ueno , Takafumi Fukushima , Shigekazu Okada , Kotaro Oda , Hiroaki Otani , Yasuomi Maki , Kenichi Kikkawa , Tsunehito Fujita , Manato Mori
摘要： A power conversion system includes a transformer, a power conversion device for travel, a power conversion device for auxiliary power sources, and an electrical storage device. The power conversion device for auxiliary power sources includes a first AC to DC conversion unit, a power conversion unit for AC loads, and a power conversion unit for DC loads. The power conversion unit for AC loads converts DC power into AC power and supplies it to an AC load. The power conversion unit for DC loads converts DC power produced through conversion by the first AC to DC conversion unit into DC power and supplies it to a DC load. The electrical storage device is connected to power lines connecting DC power output terminals of the first AC to DC conversion unit and DC power input terminals of both the power conversion units for AC and DC loads. When power supplied from a tertiary winding of the transformer to the first AC to DC conversion unit is reduced, the electrical storage device discharges power corresponding to the power reduction.
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