Patents by Inventor Keiji Kunii
Keiji Kunii has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8970155Abstract: An electric power converter is provided with a plurality of power-conversion elements; a first control circuit that outputs a first control signal; an electricity storage circuit; a second control circuit that outputs a second control signal when the direct-current power source that supplies electrical power to the first control circuit is not normal; and a drive circuit that outputs drive signals for driving the plurality of power-conversion elements. Each of the power-conversion elements is either a power-conversion element of the upper arm connected to the high-voltage side or a conversion element of the lower arm connected to the low-voltage side. In cases when the voltage of the electricity storage circuit is at a higher predetermined first voltage value, the second control circuit outputs a second control signal so that all the power-conversion elements of the upper arm or the lower arm are turned on and the others are turned off.Type: GrantFiled: February 21, 2012Date of Patent: March 3, 2015Assignee: Hitachi Automotive Systems, Ltd.Inventors: Seiji Funaba, Yasuo Noto, Masashige Tsuji, Keiji Kunii, Koichi Yahata, Shinichiro Hida
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Publication number: 20130328514Abstract: An electric power converter is provided with a plurality of power-conversion elements; a first control circuit that outputs a first control signal; an electricity storage circuit; a second control circuit that outputs a second control signal when the direct-current power source that supplies electrical power to the first control circuit is not normal; and a drive circuit that outputs drive signals for driving the plurality of power-conversion elements. Each of the power-conversion elements is either a power-conversion element of the upper arm connected to the high-voltage side or a conversion element of the lower arm connected to the low-voltage side. In cases when the voltage of the electricity storage circuit is at a higher predetermined first voltage value, the second control circuit outputs a second control signal so that all the power-conversion elements of the upper arm or the lower arm are turned on and the others are turned off.Type: ApplicationFiled: February 21, 2012Publication date: December 12, 2013Applicant: Hitachi Automotive Systems, Ltd.Inventors: Seiji Funaba, Yasuo Noto, Masashige Tsuji, Keiji Kunii, Koichi Yahata, Shinichiro Hida
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Patent number: 8130521Abstract: In a rectifier unit having a MOSFET, there is provided a stable MOSFET rectifying operation which is not influenced by a power generation condition from a start of an engine. An output VS obtained by adding phase voltages VU, VV, and VW and a power generation voltage VBR are compared by COM1. During a period of VBR>VS, a timing signal VT having a cycle of an electrical angle of 120 degrees is obtained. In synchronism with rising of logical products AND1 and AND2 based on a comparison result VH-ON of a phase voltage VU and a power generation voltage VB and a comparison result VL-ON of a phase voltage VU and a GND potential, flip-flops FF1 and FF2 are operated. Then, a gate signal VHGD of an upper-stream side MOSFET and a gate signal VLGD of a lower-stream side MOSFET are outputted to execute a MOSFET rectifying operation.Type: GrantFiled: May 22, 2009Date of Patent: March 6, 2012Assignee: Hitachi, Ltd.Inventors: Shuichi Kokubun, Shoju Masumoto, Keiji Kunii
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Patent number: 8054633Abstract: A power converter which can attain a reliable electric connection with electrodes of a power module by facilitating positioning of conductors connected to the electrodes of the power module. The power converter includes the power module having the plurality of electrodes in the form of plate-shaped conductors within a casing having a lid, and also includes a plurality of plate-shaped conductors connected to the electrodes of the power module. Male screws are embedded in ones of the electrodes of the power module provided at least on the side of the lid to be projected therefrom, the plate-shaped conductors connected to the electrodes having the male screws are formed therein with holes at locations corresponding to the male screws, the male screws being inserted in the corresponding holes, and electrically connected with the electrodes with nuts fastened to the male screws.Type: GrantFiled: June 20, 2008Date of Patent: November 8, 2011Assignee: Hitachi, Ltd.Inventors: Tokihito Suwa, Keiji Kunii, Hisaya Shimizu
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Publication number: 20090302678Abstract: In a rectifier unit having a MOSFET, there is provided a stable MOSFET rectifying operation which is not influenced by a power generation condition from a start of an engine. An output VS obtained by adding phase voltages VU, VV, and VW and a power generation voltage VBR are compared by COM1. During a period of VBR>VS, a timing signal VT having a cycle of an electrical angle of 120 degrees is obtained. In synchronism with rising of logical products AND1 and AND2 based on a comparison result VH-ON of a phase voltage VU and a power generation voltage VB and a comparison result VL-ON of a phase voltage VU and a GND potential, flip-flops FF1 and FF2 are operated. Then, a gate signal VHGD of an upper-stream side MOSFET and a gate signal VLGD of a lower-stream side MOSFET are outputted to execute a MOSFET rectifying operation.Type: ApplicationFiled: May 22, 2009Publication date: December 10, 2009Applicant: Hitachi, Ltd.Inventors: Shuichi KOKUBUN, Shoju MASUMOTO, Keiji KUNII
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Publication number: 20090002956Abstract: A power converter which can attain a reliable electric connection with electrodes of a power module by facilitating positioning of conductors connected to the electrodes of the power module. The power converter includes the power module having the plurality of electrodes in the form of plate-shaped conductors within a casing having a lid, and also includes a plurality of plate-shaped conductors connected to the electrodes of the power module. Male screws are embedded in ones of the electrodes of the power module provided at least on the side of the lid to be projected therefrom, the plate-shaped conductors connected to the electrodes having the male screws are formed therein with holes at locations corresponding to the male screws, the male screws being inserted in the corresponding holes, and electrically connected with the electrodes with nuts fastened to the male screws.Type: ApplicationFiled: June 20, 2008Publication date: January 1, 2009Applicant: Hitachi, Ltd.Inventors: Tokihito Suwa, Keiji Kunii, Hisaya Shimizu
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Patent number: 7453240Abstract: A generator having a field coil L, and an SW1 control circuit 2 for controlling field current flowing through the field coil L. When a generating operation of the generator is to be ended, a switch 1 SW1 is turned off to interrupt the field current flowing through the field coil L, and a switch 2 SW2 is turned off to allow the field current remaining the field coil L to the current path including a resistance element 1 with a resistance element capable of quickly attenuating the field current.Type: GrantFiled: February 17, 2006Date of Patent: November 18, 2008Assignee: Hitachi, Ltd.Inventors: Tatsumi Yamauchi, Shinji Shirakawa, Masahiro Iwamura, Masamitsu Inaba, Keiichi Mashino, Keiji Kunii
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Publication number: 20080007190Abstract: It is an object of the present invention to provide a motor control apparatus and on-vehicle motor drive system which can easily protect components of an inverter from overvoltage even if surplus power occurs in a generator in a system without a battery between a generator and a motor. An inverter 32 converts the DC power generated by a generator 21 to AC power, and supplies it to an AC motor 40. A controller 100 controls DC-to-AC conversion in the inverter 32. Interruption means including an overvoltage detector 36 and a semiconductor switch 38 prevents the power generated by the generator 21 from being supplied to the inverter 32 when the inverter 32 is stopped.Type: ApplicationFiled: May 30, 2007Publication date: January 10, 2008Applicant: Hitachi, Ltd.Inventors: Keiji Kunii, Tokihito Suwa, Hisaya Shimizu, Satoru Ohno
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Patent number: 7169105Abstract: A flexible tube for an endoscope has an elongated tubular core body, and an outer cover which is provided over the core body. The outer cover is composed of an inner layer, an outer layer and at least one intermediate layer. In this flexible tube, any one of the layers is different from one of the other layers in its property. Further, at least one of the layers has a thickness-varying region where the thickness of the layer varies in its longitudinal direction. In addition, the inner layer of the outer cover has projections which are integrally formed on the inner layer so that the projections project into holes and/or the recesses formed on the core body. This structure makes it possible to produce a flexible tube for an endoscope that has high durability, high flexibility and high chemical resistance as well as excellent operationability.Type: GrantFiled: April 13, 2004Date of Patent: January 30, 2007Assignee: PENTAX CorporationInventors: Kikuo Iwasaka, Tadashi Kasai, Hideo Nanba, Masaru Takeshige, Akira Sugiyama, Keiji Kunii, Masanao Abe
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Publication number: 20060192534Abstract: A generator having a field coil L, and an SW1 control circuit 2 for controlling field current flowing through the field coil L. When a generating operation of the generator is to be ended, a switch 1 SW1 is turned off to interrupt the field current flowing through the field coil L, and a switch 2 SW2 is turned off to allow the field current remaining the field coil L to the current path including a resistance element 1 with a resistance element capable of quickly attenuating the field current.Type: ApplicationFiled: February 17, 2006Publication date: August 31, 2006Applicant: Hitachi, Ltd.Inventors: Tatsumi Yamauchi, Shinji Shirakawa, Masahiro Iwamura, Masamitsu Inaba, Keiichi Mashino, Keiji Kunii
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Patent number: 6991634Abstract: A forceps of endoscope comprises a clip that is provided with at least three arms and a base end portion. The arms are connected to the base end portion. Each of the arms has an open-close deforming portion located close to the base end portion. A core member is provided inside the clip to be in contact with an inner surface of the open-close deforming portion at least when the arms are open. A clip open-close ring is operated by remote control performed from the base end of the sheath. The clip open-close member is engaged with the open-close deforming portion to open and close the arms with a substantially equivalent angular interval and so as to prevent each of the arms from crossing each other.Type: GrantFiled: May 21, 2002Date of Patent: January 31, 2006Assignee: PENTAX CorporationInventors: Akira Sugiyama, Ichiro Ninomiya, Masahiro Takano, Keiji Kunii
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Publication number: 20040193013Abstract: A flexible tube for an endoscope has an elongated tubular core body, and an outer cover which is provided over the core body. The outer cover is composed of an inner layer, an outer layer and at least one intermediate layer. In this flexible tube, any one of the layers is different from one of the other layers in its property. Further, at least one of the layers has a thickness-varying region where the thickness of the layer varies in its longitudinal direction. In addition, the inner layer of the outer cover has projections which are integrally formed on the inner layer so that the projections project into holes and/or the recesses formed on the core body. This structure makes it possible to produce a flexible tube for an endoscope that has high durability, high flexibility and high chemical resistance as well as excellent operationability.Type: ApplicationFiled: April 13, 2004Publication date: September 30, 2004Applicant: PENTAX CorporationInventors: Kikuo Iwasaka, Tadashi Kasai, Hideo Nanba, Masaru Takeshige, Akira Sugiyama, Keiji Kunii, Masanao Abe
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Publication number: 20020177861Abstract: A forceps of endoscope comprises a clip that is provided with at least three arms and a base end portion. The arms are connected to the base end portion. Each of the arms has an open-close deforming portion located close to the base end portion. A core member is provided inside the clip to be in contact with an inner surface of the open-close deforming portion at least when the arms are open. A clip open-close ring is operated by remote control performed from the base end of the sheath. The clip open-close member is engaged with the open-close deforming portion to open and close the arms with a substantially equivalent angular interval and so as to prevent each of the arms from crossing each other.Type: ApplicationFiled: May 21, 2002Publication date: November 28, 2002Applicant: Asahi Kogaku Kogyo Kabushiki KaishaInventors: Akira Sugiyama, Ichiro Ninomiya, Masahiro Takano, Keiji Kunii
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Publication number: 20020010386Abstract: A flexible tube for an endoscope has an elongated tubular core body, and an outer cover which is provided over the core body. The outer cover is composed of an inner layer, an outer layer and at least one intermediate layer. In this flexible tube, any one of the layers is different from one of the other layers in its property. Further, at least one of the layers has a thickness-varying region where the thickness of the layer varies in its longitudinal direction. In addition, the inner layer of the outer cover has projections which are integrally formed on the inner layer so that the projections project into holes and/or the recesses formed on the core body. This structure makes it possible to produce a flexible tube for an endoscope that has high durability, high flexibility and high chemical resistance as well as excellent operationability.Type: ApplicationFiled: May 4, 2001Publication date: January 24, 2002Applicant: ASAHI KOGAKU KOGYO KABUSHIKI KAISHAInventors: Minoru Matsushita, Kikuo Iwasaka, Tadashi Kasai, Hideo Nanba, Masaru Takeshige, Akira Suiyama, Keiji Kunii, Masanao Abe