-
公开(公告)号：US11217385B2
公开(公告)日：2022-01-04
申请号：US16317904
申请日：2016-09-13
申请人： Hitachi, Ltd.
摘要： In order to provide a transformer and an electric power converter which are less likely to become deteriorated with time and which have stable insulation performance, the transformer according to the present invention is provided with: a core; a bobbin in which a low-voltage-side primary winding and a high-voltage-side secondary winding are disposed along the central magnetic leg of the core; and a bobbin support part that supports the bobbin at an end of the bobbin on the primary winding side, such that an air gap is provided between the central magnetic leg of the core and a surface of the bobbin corresponding to the secondary winding.
-
公开(公告)号：US09755524B2
公开(公告)日：2017-09-05
申请号：US14563693
申请日：2014-12-08
申请人： Hitachi, Ltd.
发明人： Tomoyuki Hatakeyama , Takae Shimada
CPC分类号： H02M3/33507 , H02M3/24 , H02M3/33538 , H02M3/3376 , H02M2001/0032 , Y02B70/16
摘要： Provided is a vehicle which enables a highly-efficient DC-DC converter and a highly-efficient power supply to a load, regardless of a power supply amount of to the load. When the power supply amount to a load R1 is a predetermined value or more, a control means 5 implements a first mode for making the switching elements S1 to S4 driven, and when the power supply amount of to the load R1 is the predetermined value or less, the control means 5 implements a second mode, for making the switching elements S3 and S4 stopped in an OFF state, and making only the switching elements S1 and S2 driven.
-
公开(公告)号：US09750125B2
公开(公告)日：2017-08-29
申请号：US15159337
申请日：2016-05-19
申请人： Hitachi, Ltd.
CPC分类号： H05K1/0201 , H02M3/335 , H02M7/4807 , H02M7/487 , H02M7/49 , H05K1/0207 , H05K7/20909 , Y02B70/1433
摘要： Size and weight reduction of a transformer for system interconnection is needed. Applying an SST to the transformer can reduce the size and weight. However, it is also necessary to flexibly handle a wide range of voltages to match a high-voltage system or motor, reduce switching loss of a power device used in a power circuit such as a DC/DC converter and an inverter in association with frequency increase caused by application of the SST, and achieve size reduction of a cooling structure. Further, it is necessary to boost a voltage to a system voltage and reduce the size and weight of a large current path before the voltage boosting. Thus, an LLC resonant converter structure is applied, and a multiple-connection structure is employed in each of which a converter is arranged for an input or an inverter is arranged for an output. This enables handling of various voltage ranges by various combinations of the numbers of multiple connections of the inputs and the outputs. An insulation cooling structure is provided by a wind-tunnel structure in which two input and output substrates are opposed and are connected by insulation members, and another wind-tunnel structure arranged in the downstream of the wind-tunnel structure and including the LLC resonant structure therein. The wind-tunnel structures are integrated with each other.
-
公开(公告)号：US11296610B2
公开(公告)日：2022-04-05
申请号：US16331322
申请日：2016-12-21
申请人： Hitachi, Ltd.
发明人： Kimihisa Furukawa , Shintaro Tanaka , Takae Shimada , Akihiko Kanouda , Mizuki Nakahara , Yuuichi Mabuchi
IPC分类号： H02M3/335 , H02M1/00 , H02M3/00 , G01R19/165
摘要： An object of the present invention is to sufficiently reduce a switching loss. A control device causes a positive electrode of a first voltage to appear at a second connection point by switching second and third switching elements to an ON state. Next, the control device causes the positive electrode of the first voltage to appear at a first connection point by switching the second and third switching elements to an OFF state. After that, fifth and eighth switching elements are switched to the OFF state, and sixth and seventh switching elements are switched to the ON state.
-
公开(公告)号：US10530271B2
公开(公告)日：2020-01-07
申请号：US16309335
申请日：2017-04-10
申请人： Hitachi, Ltd.
摘要： In a power conversion device in a configuration in which a plurality of power converter cells has serially connected outputs and includes a converter and an inverter as components, when a load is light, the cells also operate with a light load, and efficiency is reduced. A power conversion device has a plurality of power converter cells. The outputs of the cells are connected in series. The device has a controller that controls the cells. The cells each have a converter that converts an externally inputted power supply voltage and generates a DC link voltage and an inverter that converts the DC link voltage into an alternating current voltage and outputs the current. The controller stops a converter in some of the cells depending on power supply electric power or load electric power. The inverter continues to operate using a link capacitor as a power supply.
-
公开(公告)号：US09887638B2
公开(公告)日：2018-02-06
申请号：US15052274
申请日：2016-02-24
申请人： Hitachi, Ltd.
发明人： Yasuaki Norimatsu , Akihiko Kanouda , Yuuichi Mabuchi , Tadahiko Chida , Takuya Ishigaki , Takae Shimada
CPC分类号： H02M5/458 , H02M1/32 , H02M3/335 , H02M7/4807 , H02M7/487 , Y02B70/1433
摘要： If an input voltage of a DC/DC converter is lower than a first voltage value that is set in advance, a converter controller maintains an output voltage of the DC/DC converter within a first voltage range that is set in advance by changing an operation frequency of switching of the DC/DC converter in compliance with the input voltage as a first voltage maintaining control. If the input voltage is higher than a second voltage value that is higher than the first voltage value, the converter controller maintains the output voltage within a second voltage range that is higher than the first voltage range by changing the operation frequency in compliance with the input voltage as a second voltage maintaining control.
-
公开(公告)号：US10998830B2
公开(公告)日：2021-05-04
申请号：US16616021
申请日：2018-04-24
申请人： Hitachi, Ltd.
发明人： Mitsuhiro Kadota , Takae Shimada
摘要： A power conversion device includes: power conversion cells; and a controller to control the cells. Each cell includes: a transformer; a primary conversion unit on a primary side of the transformer; a secondary conversion unit on a secondary side; a primary bypass device for short-circuiting between input terminals of the cell; and a secondary bypass device for short-circuiting between output terminals of the cell. The input terminals and/or the output terminals of the cells are connected in series. When the primary conversion unit(s) of a part of the cells is stopped, the controller turns on the primary bypass device and sets secondary DC link voltages to prescribed values; and when the secondary conversion unit(s) of a part of the cells is stopped, the controller turns on the secondary bypass device and controls the primary conversions units to set primary DC link voltages to prescribed values.
-
公开(公告)号：US10862311B2
公开(公告)日：2020-12-08
申请号：US16328959
申请日：2016-10-05
申请人： Hitachi, Ltd.
摘要： A power conversion device includes three first power conversion cells each converting input power and outputting the converted power and having input terminals connected in parallel regarding a first power supply and three second power conversion cells each converting input power and outputting the converted power and having input terminals connected in parallel regarding a second power supply, wherein: the power output from the cell and the power output from the cell are combined to output a first phase power; the power output from the cell and the power output from the cell are combined to output a second phase power; and the power output from the cell and the power output from the cell are combined to output a third phase power. The first phase, second phase, and third phase powers are output as the phase powers or inter-line powers of a three-phase system.
-
公开(公告)号：US09806622B2
公开(公告)日：2017-10-31
申请号：US15159018
申请日：2016-05-19
申请人： Hitachi, Ltd.
发明人： Yasuaki Norimatsu , Akihiko Kanouda , Yuuichi Mabuchi , Tadahiko Chida , Takuya Ishigaki , Takae Shimada
IPC分类号： H02M3/335 , H02M7/49 , H02J3/38 , H02M7/5387 , H02M7/48
CPC分类号： H02M3/33507 , H02J3/385 , H02M3/335 , H02M7/4807 , H02M7/49 , H02M7/5387 , Y02B70/1433 , Y02E10/56
摘要： Reduction in size and weight of transformer for grid tie applications is demanded and can be achieved by applying SST to the transformer. However, SST application to PCS for sunlight requires the following: handle a wide variation range of the voltage of solar power generation; reduce switching losses of power devices, DC/DC converter and inverter, in the power circuit to implement high frequency for SST application; increase voltage to the grid voltage; and reduce the dimensions of the high current path prior to step-up. Thus, LLC resonant converter configuration is applied with an inverter placed in the output, and series connected configuration is applied to the inverter. The LLC resonant converter is subject to constant frequency regulation with large output, step-up control with low output, and step-down control with the upper limit voltage according to MPPT voltage from sunlight, in order to achieve drive loss reduction and voltage range handling.
-
-
-
-
-
-
-
-
搜索结果
9 条记录 (耗时 0.013 秒)
