公开(公告)号：US06522109B2

公开(公告)日：2003-02-18

申请号：US10062094

申请日：2002-01-31

申请人： Katsuaki Tanaka

发明人： Katsuaki Tanaka

IPC分类号： G05F1656

CPC分类号： H02M1/34 ,  H02M3/156 ,  H02M2001/342 ,  Y02B70/1425 ,  Y02B70/1491

摘要： The present invention provides a power conversion apparatus capable of controlling switching timings of main and auxiliary switches to achieve soft-switching in both of the main and auxiliary switches. The power conversion apparatus comprises a control circuit operable to apply a turning-on signal to first and second auxiliary switches so as to turn on the first and second auxiliary switches to lead a current from an output terminal to an resonant inductor when a current from an input reactor is passing through the main switch before a turning-on signal is applied to the main switch. Subsequently, when a current passing through the resonant inductor is increased up to the same value as that of a current passing through the input reactor by a resonance generated in a resonant circuit formed of the resonant inductor and a snubber capacitor to provide approximately zero of the end voltage across the main switch, the control circuit is operable to apply a turning-on signal to the main switch.

公开(公告)号：US06411078B1

公开(公告)日：2002-06-25

申请号：US09487802

申请日：2000-01-20

申请人： Shiro Nakagawa ,  Kazuyuki Itoh ,  Katsuaki Tanaka ,  Katsumi Yabusaki

发明人： Shiro Nakagawa ,  Kazuyuki Itoh ,  Katsuaki Tanaka ,  Katsumi Yabusaki

IPC分类号： G01R3300

CPC分类号： G01R15/20 ,  G01R15/183

摘要： It is an object of the invention to provide a current sensor apparatus that reduces measurement errors resulting from variations in a position of a current path passing through the space inside a magnetic yoke. The current sensor apparatus comprises a ring-shaped magnetic yoke (2) surrounding a current path (1), part of the yoke having a gap (3), and a magnetic sensor element (4) placed in the gap (3) of the magnetic yoke (2). The magnetic sensor element (4) detects a magnetic field in the gap (3) generated by a current flowing through the current path (1) to measure the current flowing through the current path (1). The current sensor apparatus further comprises a magnetic field interrupter (5), placed between the current path (1) and the gap (3), for interrupting a magnetic field corresponding to a magnetic flux generated by the current passing through the current path (1) and not passing through the magnetic yoke (2), so that the magnetic field would not reach the magnetic sensor element (4).

摘要翻译： 本发明的目的是提供一种电流传感器装置，该电流传感器装置减少了通过磁轭内的空间的电流路径的位置变化引起的测量误差。 电流传感器装置包括围绕电流路径（1）的环形磁轭（2），具有间隙（3）的磁轭的一部分和放置在电机的间隙（3）中的磁传感器元件（4） 磁轭（2）。 磁传感器元件（4）检测由流过电流路径（1）的电流产生的间隙（3）中的磁场，以测量流过电流通路（1）的电流。 电流传感器装置还包括设置在电流路径（1）和间隙（3）之间的磁场断续器（5），用于中断与通过电流路径（1）的电流产生的磁通相对应的磁场 ）并且不通过磁轭（2），使得磁场将不会到达磁性传感器元件（4）。

公开(公告)号：US06353543B2

公开(公告)日：2002-03-05

申请号：US09858341

申请日：2001-05-14

申请人： Kazuyuki Itoh ,  Yoshihisa Okita ,  Katsuaki Tanaka

发明人： Kazuyuki Itoh ,  Yoshihisa Okita ,  Katsuaki Tanaka

IPC分类号： H02M3335

CPC分类号： H02M7/5387 ,  H02M3/1584 ,  H02M3/33576

摘要： A switching circuit for a power conversion apparatus capable of reducing conduction loss to provide a higher efficiency, and achieving downsizing and weight-reduction and higher driving frequency based on the improved efficiency is disclosed. A driving transistor is connected to a switching main transistor to supply a driving power for ON-OFF driving thereto, and an auxiliary power source composed of a current transformer is provided between the main transistor and the driving transistor. An auxiliary transistor having a lower switching loss than that of the main transistor is connected in parallel with the main transistor to form a main switch in combination with the main transistor. A current-driven type transistor serves as the main transistor, and voltage-driven type transistors serve as both of the driving transistor and the auxiliary transistor. The auxiliary transistor is adapted to be driven at a higher speed than that of the main transistor when the main transistor is turned on, and adapted to be driven at a lower speed than that of the main transistor when the main transistor is turned off.

摘要翻译： 公开了一种用于能够降低传导损耗以提供更高效率并且基于提高的效率实现小型化和减轻重量并且实现更高驱动频率的功率转换装置的开关电路。 驱动晶体管连接到开关主晶体管以提供用于导通驱动的驱动电源，并且在主晶体管和驱动晶体管之间设置由电流互感器组成的辅助电源。 具有比主晶体管低的开关损耗的辅助晶体管与主晶体管并联连接以与主晶体管组合形成主开关。 电流驱动型晶体管用作主晶体管，电压驱动型晶体管用作驱动晶体管和辅助晶体管两者。 当主晶体管导通时，辅助晶体管适于以比主晶体管更高的速度被驱动，并且当主晶体管截止时，辅助晶体管适于以比主晶体管低的速度被驱动。

公开(公告)号：US5095706A

公开(公告)日：1992-03-17

申请号：US673076

申请日：1991-03-21

申请人： Kohei Saito ,  Hiroki Yamagishi ,  Toshiki Furukawa ,  Toshio Sato ,  Hiroshi Hamano ,  Yoshio Nakano ,  Katsuaki Tanaka ,  Satoru Sakamoto

发明人： Kohei Saito ,  Hiroki Yamagishi ,  Toshiki Furukawa ,  Toshio Sato ,  Hiroshi Hamano ,  Yoshio Nakano ,  Katsuaki Tanaka ,  Satoru Sakamoto

IPC分类号： F01K9/00 ,  F01K9/02 ,  F01K13/02 ,  F01K23/10 ,  F22D11/00 ,  F28B9/10

CPC分类号： F01K9/00 ,  Y02E20/16

摘要： A start-up method of a steam turbine plant including a condenser is disclosed. The condenser includes a tube bundle composed of a number of pipes for condensing an exhaust steam from a steam turbine and a hot well for receiving and storing a condensate therein. The interior of the condenser is airtightly divided into two spaces with a partition therebetween, one of them being an upper space containing the tube bundle and the other one being a lower space containing the hot well. A communication passageway(s) extends between the upper space and the lower space with an isolation valve in the form of a butterfly valve disposed on the communication passageway. At the shut-down of the steam turbine plant, the isolation valve is closed to isolate the upper space from the lower space while the lower space is maintained in vacuum. At the start-up of the steam turbine plant, the isolation valve is opened after the upper space is evacuated, and the upper space is then communicated with the lower space which is maintained still in vacuum.

摘要翻译： 公开了一种包括冷凝器的汽轮机设备的启动方法。 冷凝器包括由许多用于冷凝来自蒸汽轮机的排气蒸汽的管道和用于在其中接收和存储冷凝物的热井组成的管束。 冷凝器的内部气密地分成两个空间，其间具有间隔，其中一个是容纳管束的上部空间，另一个是容纳热井的下部空间。 连通通道在上部空间和下部空间之间延伸，并具有设置在连通通道上的蝶阀形式的隔离阀。 在蒸汽轮机厂关闭时，隔离阀关闭，以将上部空间与下部空间隔离开，同时将下部空间保持在真空状态。 在蒸汽轮机厂启动时，在上部空间抽真空之后隔离阀打开，上部空间与保持在真空中的下部空间连通。

公开(公告)号：US3956686A

公开(公告)日：1976-05-11

申请号：US507855

申请日：1974-09-20

申请人： Katsuaki Tanaka

发明人： Katsuaki Tanaka

IPC分类号： G01K7/13 ,  G01K5/72 ,  G01K7/12

CPC分类号： G01K7/13

摘要： A compensating circuit for a cold junction of a thermocouple includes a sign inverting amplifier, a power source and a summing amplifier. A thermo-electromotive force of the thermocouple, the output of the sign inverting amplifier and the voltage of the power source are applied to one input terminal of the summing amplifier through resistors. An output corresponding to the temperature of the hot junction of the thermocouple is obtained from the output terminal of the summing amplifier.

摘要翻译： 用于热电偶的冷接点的补偿电路包括符号反相放大器，电源和求和放大器。 热电偶的热电动势，符号反相放大器的输出和电源的电压通过电阻施加到求和放大器的一个输入端。 从加法放大器的输出端获得对应于热电偶的热接点的温度的输出。