Patents by Inventor Yutaka Okubo
Yutaka Okubo 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: 11798749Abstract: A filter circuit device includes: first and second core members forming first and second through holes, respectively; a first conductor passing through the first and second through holes; a second conductor passing through the first and second through holes; a capacitor; a first terminal configured to electrically connect the first conductor with the capacitor; and a second terminal configured to electrically connect the second conductor with the capacitor. The first conductor from the first through hole to the second through hole and the second conductor from the first through hole to the second through hole have an opposing part between the first conductor and the second conductor. The first terminal presses an opposite surface of the first conductor, so as to be in contact with the first conductor. The second terminal presses an opposite surface of the second conductor, so as to be in contact with the second conductor.Type: GrantFiled: December 26, 2018Date of Patent: October 24, 2023Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Yutaka Okubo, Hiroki Funato, Hiroyuki Yamai, Taesung Kim
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Patent number: 11456675Abstract: Since inductance due to wiring to a Y capacitor is large, it is necessary to arrange the Y capacitor near a bus bar, and there is no degree of freedom in arranging the Y capacitor. Directions of currents flowing through a positive electrode side wiring 301 and a negative electrode side wiring 302 in a multi-core cable 300 are a direction 301a from a bus bar positive electrode terminal 114 toward the Y capacitor positive electrode terminal 201, and a direction 302b from a bus bar negative electrode terminal 115 toward the Y capacitor negative electrode terminal 202, respectively. On the other hand, a direction of a current flowing through a ground wiring 303 is a direction 302b from a Y capacitor ground terminal 203 toward a ground terminal 116.Type: GrantFiled: August 6, 2019Date of Patent: September 27, 2022Assignee: Hitachi Astemo, Ltd.Inventors: Yusaku Katsube, Hiroki Funato, Isao Hoda, Aya Ohmae, Fusanori Nishikimi, Yutaka Okubo
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Publication number: 20220052616Abstract: Since inductance due to wiring to a Y capacitor is large, it is necessary to arrange the Y capacitor near a bus bar, and there is no degree of freedom in arranging the Y capacitor. Directions of currents flowing through a positive electrode side wiring 301 and a negative electrode side wiring 302 in a multi-core cable 300 are a direction 301a from a bus bar positive electrode terminal 114 toward the Y capacitor positive electrode terminal 201, and a direction 302b from a bus bar negative electrode terminal 115 toward the Y capacitor negative electrode terminal 202, respectively. On the other hand, a direction of a current flowing through a ground wiring 303 is a direction 302b from a Y capacitor ground terminal 203 toward a ground terminal 116.Type: ApplicationFiled: August 6, 2019Publication date: February 17, 2022Inventors: Yusaku KATSUBE, Hiroki FUNATO, Isao HODA, Aya OHMAE, Fusanori NISHIKIMI, Yutaka OKUBO
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Patent number: 11011996Abstract: An object of the present invention is to improve the reliability of a power converter against electromagnetic noise.Type: GrantFiled: January 29, 2018Date of Patent: May 18, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Akira Ishii, Hiroyuki Saito, Yutaka Okubo, Ryuji Kurihara, Yuji Sobu
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Publication number: 20210036675Abstract: A filter circuit device includes: first and second core members forming first and second through holes, respectively; a first conductor passing through the first and second through holes; a second conductor passing through the first and second through holes; a capacitor; a first terminal configured to electrically connect the first conductor with the capacitor; and a second terminal configured to electrically connect the second conductor with the capacitor. The first conductor from the first through hole to the second through hole and the second conductor from the first through hole to the second through hole have an opposing part between the first conductor and the second conductor. The first terminal presses an opposite surface of the first conductor, so as to be in contact with the first conductor. The second terminal presses an opposite surface of the second conductor, so as to be in contact with the second conductor.Type: ApplicationFiled: December 26, 2018Publication date: February 4, 2021Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Yutaka OKUBO, Hiroki FUNATO, Hiroyuki YAMAI, Taesung KIM
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Patent number: 10903736Abstract: There is provided a power converter which can suppress a surge voltage and reduce noise flowing from an input of a power changer. The power converter includes an inverter circuit 140, a capacitor 514 for smoothing DC power, a capacitor 515 for removing noise, and conductors 564p and 564n. The conductors 564p and 564n are connected to the capacitors 514 and 515 when power side terminals 562p and 562n are connected to an inverter circuit 140, and power source side terminals 561p and 561n are connected to a battery 136. In the conductors 564p and 564n, a parasitic inductance L1 between capacitor terminals 563p and 563n and capacitor terminals 560p and 560n is larger than a parasitic inductance L2 between capacitor terminals 563p and 563n and the power side terminals 562p and 562n.Type: GrantFiled: July 22, 2019Date of Patent: January 26, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Youhei Nishizawa, Kaname Sasaki, Yutaka Okubo, Yuki Fujita
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Publication number: 20200007026Abstract: There is provided a power converter which can suppress a surge voltage and reduce noise flowing from an input of a power changer. The power converter includes an inverter circuit 140, a capacitor 514 for smoothing DC power, a capacitor 515 for removing noise, and conductors 564p and 564n. The conductors 564p and 564n are connected to the capacitors 514 and 515 when power side terminals 562p and 562n are connected to an inverter circuit 140, and power source side terminals 561p and 561n are connected to a battery 136. In the conductors 564p and 564n, a parasitic inductance L1 between capacitor terminals 563p and 563n and capacitor terminals 560p and 560n is larger than a parasitic inductance L2 between capacitor terminals 563p and 563n and the power side terminals 562p and 562n.Type: ApplicationFiled: July 22, 2019Publication date: January 2, 2020Applicant: Hitachi Automotive Systems, Ltd.Inventors: Youhei NISHIZAWA, Kaname SASAKI, Yutaka OKUBO, Yuki FUJITA
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Publication number: 20190386577Abstract: An object of the present invention is to improve the reliability of a power converter against electromagnetic noise.Type: ApplicationFiled: January 29, 2018Publication date: December 19, 2019Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Akira ISHII, Hiroyuki SAITO, Yutaka OKUBO, Ryuji KURIHARA, Yuji SOBU
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Patent number: 10461656Abstract: An object of the invention is to provide a power conversion device which secures insulation and is miniaturized still more without being affected by electromagnetic noises. A power conversion device according to the invention includes a power semiconductor module which converts a DC current into an AC current and includes a DC positive terminal and a DC negative terminal, and a resin cover portion which includes an insulating portion disposed between the DC positive terminal and the DC negative terminal. The cover portion holds a metal member which covers the DC positive terminal and the DC negative terminal.Type: GrantFiled: September 18, 2015Date of Patent: October 29, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Yutaka Okubo, Kaname Sasaki, Satoru Shigeta, Kenichirou Nakajima
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Patent number: 10404156Abstract: There is provided a power converter which can suppress a surge voltage and reduce noise flowing from an input of a power changer. The power converter includes an inverter circuit 140, a capacitor 514 for smoothing DC power, a capacitor 515 for removing noise, and conductors 564p and 564n. The conductors 564p and 564n are connected to the capacitors 514 and 515 when power side terminals 562p and 562n are connected to an inverter circuit 140, and power source side terminals 561p and 561n are connected to a battery 136. In the conductors 564p and 564n, a parasitic inductance L1 between capacitor terminals 563p and 563n and capacitor terminals 560p and 560n is larger than a parasitic inductance L2 between capacitor terminals 563p and 563n and the power side terminals 562p and 562n.Type: GrantFiled: December 6, 2018Date of Patent: September 3, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Youhei Nishizawa, Kaname Sasaki, Yutaka Okubo, Yuki Fujita
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Publication number: 20190123659Abstract: Reliability of a power converter is improved while suppressing an increase in size and an increase in cost of the power converter. A power converter according to the present invention includes a power semiconductor module and a flow path forming body which contains the power semiconductor module and forms a flow path through which a refrigerant flows. In the flow path forming body, a first opening which communicates one surface of the flow path forming body with the flow path is formed, and in the power semiconductor module, a first sealing surface which is formed along an insertion direction of the power semiconductor module into the flow path and faces the flow path forming body and a second sealing surface which is formed along the insertion direction and faces the flow path forming body are formed.Type: ApplicationFiled: March 2, 2017Publication date: April 25, 2019Inventors: Yutaka OKUBO, Tokihito SUWA, Yusuke TAKAGI
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Publication number: 20190109532Abstract: There is provided a power converter which can suppress a surge voltage and reduce noise flowing from an input of a power changer. The power converter includes an inverter circuit 140, a capacitor 514 for smoothing DC power, a capacitor 515 for removing noise, and conductors 564p and 564n. The conductors 564p and 564n are connected to the capacitors 514 and 515 when power side terminals 562p and 562n are connected to an inverter circuit 140, and power source side terminals 561p and 561n are connected to a battery 136. In the conductors 564p and 564n, a parasitic inductance L1 between capacitor terminals 563p and 563n and capacitor terminals 560p and 560n is larger than a parasitic inductance L2 between capacitor terminals 563p and 563n and the power side terminals 562p and 562n.Type: ApplicationFiled: December 6, 2018Publication date: April 11, 2019Applicant: Hitachi Automotive Systems, Ltd.Inventors: Youhei NISHIZAWA, Kaname SASAKI, Yutaka OKUBO, Yuki FUJITA
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Patent number: 10181783Abstract: There is provided a power converter which can suppress a surge voltage and reduce noise flowing from an input of a power changer. The power converter includes an inverter circuit 140, a capacitor 514 for smoothing DC power, a capacitor 515 for removing noise, and conductors 564p and 564n. The conductors 564p and 564n are connected to the capacitors 514 and 515 when power side terminals 562p and 562n are connected to an inverter circuit 140, and power source side terminals 561p and 561n are connected to a battery 136. In the conductors 564p and 564n, a parasitic inductance L1 between capacitor terminals 563p and 563n and capacitor terminals 560p and 560n is larger than a parasitic inductance L2 between capacitor terminals 563p and 563n and the power side terminals 562p and 562n.Type: GrantFiled: January 2, 2018Date of Patent: January 15, 2019Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Youhei Nishizawa, Kaname Sasaki, Yutaka Okubo, Yuki Fujita
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Publication number: 20180123445Abstract: There is provided a power converter which can suppress a surge voltage and reduce noise flowing from an input of a power changer. The power converter includes an inverter circuit 140, a capacitor 514 for smoothing DC power, a capacitor 515 for removing noise, and conductors 564p and 564n. The conductors 564p and 564n are connected to the capacitors 514 and 515 when power side terminals 562p and 562n are connected to an inverter circuit 140, and power source side terminals 561p and 561n are connected to a battery 136. In the conductors 564p and 564n, a parasitic inductance L1 between capacitor terminals 563p and 563n and capacitor terminals 560p and 560n is larger than a parasitic inductance L2 between capacitor terminals 563p and 563n and the power side terminals 562p and 562n.Type: ApplicationFiled: January 2, 2018Publication date: May 3, 2018Applicant: Hitachi Automotive Systems, Ltd.Inventors: Youhei NISHIZAWA, Kaname SASAKI, Yutaka OKUBO, Yuki FUJITA
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Patent number: 9893603Abstract: There is provided a power converter which can suppress a surge voltage and reduce noise flowing from an input of a power changer. The power converter includes an inverter circuit 140, a capacitor 514 for smoothing DC power, a capacitor 515 for removing noise, and conductors 564p and 564n. The conductors 564p and 564n are connected to the capacitors 514 and 515 when power side terminals 562p and 562n are connected to an inverter circuit 140, and power source side terminals 561p and 561n are connected to a battery 136. In the conductors 564p and 564n, a parasitic inductance L1 between capacitor terminals 563p and 563n and capacitor terminals 560p and 560n is larger than a parasitic inductance L2 between capacitor terminals 563p and 563n and the power side terminals 562p and 562n.Type: GrantFiled: May 11, 2015Date of Patent: February 13, 2018Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Youhei Nishizawa, Kaname Sasaki, Yutaka Okubo, Yuki Fujita
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Publication number: 20170222570Abstract: An object of the invention is to provide a power conversion device which secures insulation and is miniaturized still more without being affected by electromagnetic noises. A power conversion device according to the invention includes a power semiconductor module which converts a DC current into an AC current and includes a DC positive terminal and a DC negative terminal, and a resin cover portion which includes an insulating portion disposed between the DC positive terminal and the DC negative terminal. The cover portion holds a metal member which covers the DC positive terminal and the DC negative terminal.Type: ApplicationFiled: September 18, 2015Publication date: August 3, 2017Inventors: Yutaka OKUBO, Kaname SASAKI, Satoru SHIGETA, Kenichirou NAKAJIMA
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Publication number: 20170063218Abstract: There is provided a power converter which can suppress a surge voltage and reduce noise flowing from an input of a power changer. The power converter includes an inverter circuit 140, a capacitor 514 for smoothing DC power, a capacitor 515 for removing noise, and conductors 564p and 564n. The conductors 564p and 564n are connected to the capacitors 514 and 515 when power side terminals 562p and 562n are connected to an inverter circuit 140, and power source side terminals 561p and 561n are connected to a battery 136. In the conductors 564p and 564n, a parasitic inductance L1 between capacitor terminals 563p and 563n and capacitor terminals 560p and 560n is larger than a parasitic inductance L2 between capacitor terminals 563p and 563n and the power side terminals 562p and 562n.Type: ApplicationFiled: May 11, 2015Publication date: March 2, 2017Applicant: Hitachi Automotive Systems, Ltd.Inventors: Youhei NISHIZAWA, Kaname SASAKI, Yutaka OKUBO, Yuki FUJITA
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Patent number: 5091000Abstract: Molten metal is put under pressure of up to 10 atmospheres in a covered ladle and a gas soluble in the metal is bubbled through the melt. Some gas goes into solution, while the remainder rises in bubbles and brings inclusions suspended in the molten metal up to the surface. Then the pressure is lowered, after which gas comes out of the solution in fine bubbles which also bring impurity inclusions up to the surface. In another method molten steel is refined at pressures not exceeding atmospheric pressure in a covered ladle equipped for evacuation and equipped for bubbling gas through the molten steel bath. Bubbling followed by pressure reduction can then be performed to form two stages of cleaning. Heat may be added for compensating the cooling effect of gas expansion.Type: GrantFiled: April 30, 1990Date of Patent: February 25, 1992Assignee: NKK CorporationInventors: Toshio Ishii, Yutaka Okubo, Shuzo Fukuda, Yoshihiko Kawai, Shunichi Sugiyama, Yoshiteru Kikuchi, Hidetoshi Matsuno
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Patent number: 4456971Abstract: A semiconductor random access memory system for use in a processor system is adapted to operate with a magnetic disc storage device, such as the so-called floppy-disc store. A semiconductor RAM has data input/output terminals and address terminals for writing data into or reading data out of a storage location that is addressed by an address signal supplied to the address terminals. Track and sector address registers are coupled to the processor system for receiving and storing the typical track and sector address signals normally generated in the system. A counter counts timing pulses to produce a changing count signal, which timing pulses are generated by a timing control circuit.Type: GrantFiled: February 4, 1982Date of Patent: June 26, 1984Assignee: Sony CorporationInventors: Joji Fukuda, Yutaka Okubo