Patents by Inventor Kouji Higuchi
Kouji Higuchi 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: 8285400Abstract: There is provided a digital controller which can reduce a variation in output voltage as compared to the conventional digital controller at the time of abrupt changes in load and in input of a power amplifier. The digital controller is built in the power amplifier for supplying an output voltage vo to a load and is equipped with a manipulated variable calculating unit which detects the output voltage vo to calculate a manipulated variable ?1 and a signal generating unit which converts the manipulated variable ?1 into a signal for making the power amplifier operate. A feedforward function from an equivalent disturbance qy caused by the variation in the load is replaced by a feedback function from the output voltage vo and the manipulated variable ?1, thereby allowing a transfer characteristic from the disturbance qy to the output voltage vo to result in a quadratic differential characteristic.Type: GrantFiled: December 11, 2007Date of Patent: October 9, 2012Assignee: TDK-Lambda CorporationInventors: Kouji Higuchi, Kazushi Nakano, Tatsuyoshi Kajikawa, Eiji Takegami, Kazushi Watanabe, Satoshi Tomioka
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Patent number: 8099199Abstract: There is provided a digital controller which can generate no oscillation even if sensing a load side and enables control of supplying a desired voltage to the load. In an power amplifier which supplies an output voltage vo to the load connected via a load connecting line, a load voltage vL and the output voltage vo are periodically sampled to calculate a manipulating variable ?1 from the output voltage vo, the load voltage vL and an arbitrary target value r. Based on the manipulating variable ?1 calculated, a control signal is output to the power amplifier. As a result, when connecting an LC filter with a load device 9 of the power amplifier intended for a control target and besides the load connecting line is long, a robust digital controller without generating oscillation even if sensing the load side is performed can be realized.Type: GrantFiled: March 22, 2007Date of Patent: January 17, 2012Assignee: TDK-Lameda CorporationInventors: Eiji Takegami, Kazushi Watanabe, Satoshi Tomioka, Kouji Higuchi, Kazushi Nakano, Tatsuyoshi Kajikawa
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Publication number: 20100114399Abstract: There is provided a digital controller which can reduce a variation in output voltage as compared to the conventional digital controller at the time of abrupt changes in load and in input of a power amplifier. The digital controller is built in the power amplifier for supplying an output voltage vo to a load and is equipped with a manipulated variable calculating unit which detects the output voltage vo to calculate a manipulated variable ?1 and a signal generating unit which converts the manipulated variable ?1 into a signal for making the power amplifier operate. A feedforward function from an equivalent disturbance qy caused by the variation in the load is replaced by a feedback function from the output voltage vo and the manipulated variable ?1, thereby allowing a transfer characteristic from the disturbance qy to the output voltage vo to result in a quadratic differential characteristic.Type: ApplicationFiled: December 11, 2007Publication date: May 6, 2010Applicants: UNIVERSITY OF ELECTRO-COMMUNICATIONS, TDK-LAMBDA CORPORATION, KABUSHIKI KAISHA CAMPUSCREATEInventors: Kouji Higuchi, Kazushi Nakano, Tatsuyoshi Kajikawa, Eiji Takegami, Kazushi Watanabe, Satoshi Tomioka
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Patent number: 7620462Abstract: A robust digital controller is equipped with a high degree of approximation and is able to incorporate a novel two-degree-of-freedom robust digital control system without substantially considering the magnitude of the control inputs and there is provided its designing device. A control compensating means is configured as an integral type control system in which a discrete transfer function Wry (z) between a target value r and a controlled variable y is approximated to a higher-approximate quadratic approximate model transfer function Wm (z) and an arithmetic processing can be performed within the digital controller based on the model transfer function Wm (z). Further, the designing device automatically calculates parameters constituting the control system. Consequently, a robust digital controller can be easily realized that is equipped with a high degree of approximation as compared with a conventional approximate digital control system for realizing a first-order model and is robust against output noises.Type: GrantFiled: July 28, 2005Date of Patent: November 17, 2009Assignees: University of Electro-Communications, Kabushiki Kaisha Campuscreate, TDK-Lambda CorporationInventors: Kouji Higuchi, Kazushi Nakano, Tatsuyoshi Kajikawa, Eiji Takegami, Kazushi Watanabe, Satoshi Tomioka
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Publication number: 20090099704Abstract: There is provided a digital controller which can generate no oscillation even if sensing a load side and enables control of supplying a desired voltage to the load. In an power amplifier which supplies an output voltage vo to the load connected via a load connecting line, a load voltage vL and the output voltage vo are periodically sampled to calculate a manipulating variable ?1 from the output voltage vo, the load voltage vL and an arbitrary target value r. Based on the manipulating variable ?1 calculated, a control signal is output to the power amplifier. As a result, when connecting an LC filter with a load device 9 of the power amplifier intended for a control target and besides the load connecting line is long, a robust digital controller without generating oscillation even if sensing the load side is performed can be realized.Type: ApplicationFiled: March 22, 2007Publication date: April 16, 2009Applicants: UNIVERSITY OF ELECTRO- COMMUNICATIONS, DENSEI-LAMBDA KABUSHIKI KAISHA, KABUSHIKI KAISHA CAMPUSCREATEInventors: Eiji Takegami, Kazushi Watanabe, Satoshi Tomioka, Kouji Higuchi, Kazushi Nakano, Tatsuyoshi Kajikawa
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Patent number: 7494108Abstract: A motor-operated valve has a rotor unit in a can, and is rotationally driven by a stator unit. The rotation of the rotor unit is transmitted to a screw feed member. A stem member fixed to a valve body is engaged threadedly with the screw feed member by a first screw portion. At the same time, the screw feed member is engaged threadedly with an external thread portion fixed to a valve stem by the second screw portion. The first screw portion and the second screw portion constitute a differential screw mechanism, and feeds the valve stem according to a difference in pitch.Type: GrantFiled: May 1, 2006Date of Patent: February 24, 2009Assignee: Fujikoki CorporationInventors: Yasushi Inoue, Kouji Higuchi, Hitoshi Umezawa
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Publication number: 20070250186Abstract: A robust digital controller is equipped with a high degree of approximation and is able to incorporate a novel two-degree-of-freedom robust digital control system without substantially considering the magnitude of the control inputs and there is provided its designing device. A control compensating means is configured as an integral type control system in which a discrete transfer function Wry(z) between a target value r and a controlled variable y is approximated to a higher-approximate quadratic approximate model transfer function Wm(z) and an arithmetic processing can be performed within the digital controller based on the model transfer function Wm(z). Further, the designing device automatically calculates parameters constituting the control system. Consequently, a robust digital controller can be easily realized that is equipped with a high degree of approximation as compared with a conventional approximate digital control system for realizing a first-order model and is robust against output noises.Type: ApplicationFiled: July 28, 2005Publication date: October 25, 2007Applicant: UNIVERSITY OF ELECTRO-COMMUNICATIONSInventors: Kouji Higuchi, Kazushi Nakano, Tatsuyoshi Kajikawa, Eiji Takegami, Kazushi Watanabe, Satoshi Tomioka
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Publication number: 20060261302Abstract: A motor-operated valve has a rotor unit in a can, and is rotationally driven by a stator unit. The rotation of the rotor unit is transmitted to a screw feed member. A stem member fixed to a valve body is engaged threadedly with the screw feed member by a first screw portion. At the same time, the screw feed member is engaged threadedly with an external thread portion fixed to a valve stem by the second screw portion. The first screw portion and the second screw portion constitute a differential screw mechanism, and feeds the valve stem according to a difference in pitch.Type: ApplicationFiled: May 1, 2006Publication date: November 23, 2006Inventors: Yasushi Inoue, Kouji Higuchi, Hitoshi Umezawa
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Patent number: 6537315Abstract: An artificial heart has a driving section, a nozzle section, a pump section for insertion into a ventricle of a human heart, and a sealing section forming a seal for a driving shaft extending from the driving section for driving the pump section. A sealing liquid chamber filled with a sealing liquid is formed around the driving shaft between the sealing mechanism and the driving section. The sealing liquid in the sealing liquid chamber maintains the sealing mechanism in a liquid-tight state and lubricates the sealing mechanism, whereby blood is prevented from entering the driving section. Even if blood happens to enter the driving section, the blood is mixed with the sealing liquid and does not coagulate. Thus, the operation of the artificial heart is not suppressed.Type: GrantFiled: June 12, 2001Date of Patent: March 25, 2003Assignees: Sun Medical Technology Research Corporation, NOK Corporation, Seiko Epson CorporationInventors: Kenji Yamazaki, Toshio Mori, Haruo Iiyama, Shunichi Yamazaki, Nobutaka Ito, Osami Miyao, Masanori Hori, Yukio Iwasaki, Hitoshi Adachi, Kouji Higuchi
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Patent number: 6387125Abstract: An artificial heart has a driving section, a nozzle section, a pump section for insertion into a ventricle of a human heart, and a sealing section forming a seal for a driving shaft extending from the driving section for driving the pump section. A sealing liquid chamber filled with a sealing liquid is formed around the driving shaft between the sealing mechanism and the driving section. The sealing liquid in the sealing liquid chamber maintains the sealing mechanism in a liquid-tight state and lubricates the sealing mechanism, whereby blood is prevented from entering the driving section. Even if blood happens to enter the driving section, the blood is mixed with the sealing liquid and does not coagulate. Thus, the operation of the artificial heart is not suppressed.Type: GrantFiled: December 22, 1999Date of Patent: May 14, 2002Assignees: Sun Medical Technology Research Corporation, NOK Corporation, Seiko Epson CorporationInventors: Kenji Yamazaki, Toshio Mori, Haruo Iiyama, Shunichi Yamazaki, Nobutaka Ito, Osami Miyao, Masanori Hori, Yukio Iwasaki, Hitoshi Adachi, Kouji Higuchi
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Patent number: 6346120Abstract: An artificial heart has a driving section, a nozzle section, a pump section for insertion into a ventricle of a human heart, and a sealing section forming a seal for a driving shaft extending from the driving section for driving the pump section. A sealing liquid chamber filled with a sealing liquid is formed around the driving shaft between the sealing mechanism and the driving section. The sealing liquid in the sealing liquid chamber maintains the sealing mechanism in a liquid-tight state and lubricates the sealing mechanism, whereby blood is prevented from entering the driving section. Even if blood happens to enter the driving section, the blood is mixed with the sealing liquid and does not coagulate. Thus, the operation of the artificial heart is not suppressed.Type: GrantFiled: December 22, 1999Date of Patent: February 12, 2002Assignees: Sun Medical Technology Research Corporation, NOK Corporation, Seiko Epson CorporationInventors: Kenji Yamazaki, Toshio Mori, Haruo Iiyama, Shunichi Yamazaki, Nobutaka Ito, Osami Miyao, Masanori Hori, Yukio Iwasaki, Hitoshi Adachi, Kouji Higuchi
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Patent number: 6336939Abstract: An artificial heart has a driving section, a nozzle section, a pump section for insertion into a ventricle of a human heart, and a sealing section forming a seal for a driving shaft extending from the driving section for driving the pump section. A sealing liquid chamber filled with a sealing liquid is formed around the driving shaft between the sealing mechanism and the driving section. The sealing liquid in the sealing liquid chamber maintains the sealing mechanism in a liquid-tight state and lubricates the sealing mechanism, whereby blood is prevented from entering the driving section. Even if blood happens to enter the driving section, the blood is mixed with the sealing liquid and does not coagulate. Thus, the operation of the artificial heart is not suppressed.Type: GrantFiled: December 22, 1999Date of Patent: January 8, 2002Assignees: Sun Medical Technology Research Corporation, NOK Corporation, Seiko Epson CorporationInventors: Kenji Yamazaki, Toshio Mori, Haruo Iiyama, Shunichi Yamazaki, Nobutaka Ito, Osami Miyao, Masanori Hori, Yukio Iwasaki, Hitoshi Adachi, Kouji Higuchi
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Publication number: 20010041934Abstract: An artificial heart has a driving section, a nozzle section, a pump section for insertion into a ventricle of a human heart, and a sealing section forming a seal for a driving shaft extending from the driving section for driving the pump section. A sealing liquid chamber filled with a sealing liquid is formed around the driving shaft between the sealing mechanism and the driving section. The sealing liquid in the sealing liquid chamber maintains the sealing mechanism in a liquid-tight state and lubricates the sealing mechanism, whereby blood is prevented from entering the driving section. Even if blood happens to enter the driving section, the blood is mixed with the sealing liquid and does not coagulate. Thus, the operation of the artificial heart is not suppressed.Type: ApplicationFiled: June 12, 2001Publication date: November 15, 2001Applicant: Sun Medical Technology Research Corporation; NOK Corporation; Seiko Epson CorporationInventors: Kenji Yamazaki, Toshio Mori, Haruo Iiyama, Shunichi Yamazaki, Nobutaka Ito, Osami Miyao, Masanori Hori, Yukio Iwasaki, Hitoshi Adachi, Kouji Higuchi
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Patent number: 6302910Abstract: An artificial heart has a driving section, a nozzle section, a pump section for insertion into a ventricle of a human heart, and a sealing section forming a seal for a driving shaft extending from the driving section for driving the pump section. A sealing liquid chamber filled with a sealing liquid is formed around the driving shaft between the sealing mechanism and the driving section. The sealing liquid in the sealing liquid chamber maintains the sealing mechanism in a liquid-tight state and lubricates the sealing mechanism, whereby blood is prevented from entering the driving section. Even if blood happens to enter the driving section, the blood is mixed with the sealing liquid and does not coagulate. Thus, the operation of the artificial heart is not suppressed.Type: GrantFiled: December 22, 1999Date of Patent: October 16, 2001Assignees: Sun Medical Technology Research Corporation, NOK Corporation, Seiko Epson CorporationInventors: Kenji Yamazaki, Toshio Mori, Haruo Iiyama, Shunichi Yamazaki, Nobutaka Ito, Osami Miyao, Masanori Hori, Yukio Iwasaki, Hitoshi Adachi, Kouji Higuchi