Patents by Inventor Yuji SOBU
Yuji SOBU 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: 11101739Abstract: A switching loss of a power conversion device is sufficiently reduced. A DC-DC converter includes a switching circuit that converts input first DC power into AC power, a transformer that performs voltage conversion of the AC power, and an output circuit that converts the AC power subjected to the voltage conversion by the transformer into second DC power. The control circuit that controls the DC-DC converter calculates a magnetic flux density value B of the transformer and controls a drive frequency of the switching circuit based on the calculated magnetic flux density value B.Type: GrantFiled: October 4, 2018Date of Patent: August 24, 2021Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Shintaro Tanaka, Kenji Kubo, Takayuki Ouchi, Yuji Sobu, Naoya Takahashi
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Patent number: 11043906Abstract: A power conversion apparatus PWCS includes a smoothing capacitance element Cxp connected between a positive terminal and a negative terminal of a power source and configured to smooth a voltage change superimposed on a DC voltage, a switching circuit SWC converting the DC voltage into an AC voltage, a first bus bar BSB1 configured to electrically connect between the positive terminal of the power source and a terminal TCx1 of the smoothing capacitance element Cxp, a second bus bar BSB2 configured to electrically connect between the negative terminal of the power source and a terminal TCx2 of the smoothing capacitance element Cxp, and a filtering capacitance elements C1 and C2 electrically connected between the first bus bar BSB1 and the second bus bar BSB2. The first bus bar BSB1 and the second bus bar BSB2 include opposing portions and are disposed to allow the current to flow through the opposing portions in the same direction.Type: GrantFiled: October 17, 2017Date of Patent: June 22, 2021Assignee: Hitachi Automotive Systems, Ltd.Inventors: Jia Li, Isao Hoda, Yuji Sobu
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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: 20210135578Abstract: A switching loss of a power conversion device is sufficiently reduced. A DC-DC converter includes a switching circuit that converts input first DC power into AC power, a transformer that performs voltage conversion of the AC power, and an output circuit that converts the AC power subjected to the voltage conversion by the transformer into second DC power. The control circuit that controls the DC-DC converter calculates a magnetic flux density value B of the transformer and controls a drive frequency of the switching circuit based on the calculated magnetic flux density value B.Type: ApplicationFiled: October 4, 2018Publication date: May 6, 2021Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Shintaro TANAKA, Kenji KUBO, Takayuki OUCHI, Yuji SOBU, Naoya TAKAHASHI
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Patent number: 10564187Abstract: To provide a further miniaturized and densified current detection device or a power conversion apparatus including the same. A current detection device or a power conversion apparatus according to the present invention includes: a plurality of conductors corresponding to currents of a plurality of phases; and a current sensor. The plurality of conductors is formed so as to have a conductor portion in which the currents flowing in the plurality of conductors, respectively, are substantially parallel. In a cross section in a direction perpendicular to a flow direction of the current of the conductor portion, the current sensor is arranged in a region sandwiched between the plurality of conductor portions, and outputs information on a current flowing in the conductor based on a combination of magnetic field vectors generated by the plurality of currents.Type: GrantFiled: April 7, 2017Date of Patent: February 18, 2020Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Satoru Shigeta, Atsushi Okabe, Yuji Sobu
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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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Publication number: 20190312522Abstract: A power conversion apparatus PWCS includes a smoothing capacitance element Cxp connected between a positive terminal and a negative terminal of a power source and configured to smooth a voltage change superimposed on a DC voltage, a switching circuit SWC converting the DC voltage into an AC voltage, a first bus bar BSB1 configured to electrically connect between the positive terminal of the power source and a terminal TCx1 of the smoothing capacitance element Cxp, a second bus bar BSB2 configured to electrically connect between the negative terminal of the power source and a terminal TCx2 of the smoothing capacitance element Cxp, and a filtering capacitance elements C1 and C2 electrically connected between the first bus bar BSB1 and the second bus bar BSB2. The first bus bar BSB1 and the second bus bar BSB2 include opposing portions and are disposed to allow the current to flow through the opposing portions in the same direction.Type: ApplicationFiled: October 17, 2017Publication date: October 10, 2019Inventors: Jia LI, Isao HODA, Yuji SOBU
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Patent number: 10404159Abstract: An electric circuit device includes a noise generating circuit unit which generates noises, a housing which stores the noise generating circuit unit thereinside, is electrically earthed, and includes an opening, a control board which is provided with a connector to connect a wiring to an outside, a base plate which is disposed between the noise generating circuit unit and the control board to cover the opening of the housing, and a high impedance component which has impedance higher than the base plate against the noises. The base plate includes a first base plate which supports the control board, and a second base plate which is separated from the first base plate. The first base plate and the second base plate are disposed to interpose the high impedance component therebetween.Type: GrantFiled: November 8, 2016Date of Patent: September 3, 2019Assignee: Hitachi Automotive Systems, Ltd.Inventors: Jia Li, Keisuke Fukumasu, Yuji Sobu, Hiroki Funato
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Publication number: 20190154736Abstract: To provide a further miniaturized and densified current detection device or a power conversion apparatus including the same. A current detection device or a power conversion apparatus according to the present invention includes: a plurality of conductors corresponding to currents of a plurality of phases; and a current sensor. The plurality of conductors is formed so as to have a conductor portion in which the currents flowing in the plurality of conductors, respectively, are substantially parallel. In a cross section in a direction perpendicular to a flow direction of the current of the conductor portion, the current sensor is arranged in a region sandwiched between the plurality of conductor portions, and outputs information on a current flowing in the conductor based on a combination of magnetic field vectors generated by the plurality of currents.Type: ApplicationFiled: April 7, 2017Publication date: May 23, 2019Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Satoru SHIGETA, Atsushi OKABE, Yuji SOBU
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Publication number: 20190081555Abstract: An electric circuit device includes a noise generating circuit unit which generates noises, a housing which stores the noise generating circuit unit thereinside, is electrically earthed, and includes an opening, a control board which is provided with a connector to connect a wiring to an outside, a base plate which is disposed between the noise generating circuit unit and the control board to cover the opening of the housing, and a high impedance component which has impedance higher than the base plate against the noises. The base plate includes a first base plate which supports the control board, and a second base plate which is separated from the first base plate. The first base plate and the second base plate are disposed to interpose the high impedance component therebetween.Type: ApplicationFiled: November 8, 2016Publication date: March 14, 2019Inventors: Jia LI, Keisuke FUKUMASU, Yuji SOBU, Hiroki FUNATO
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Patent number: 10103619Abstract: An electric power conversion device includes: an active circuit section emitting noises; an output-side filter circuit section; a chassis including a first space and a second space for housing the active circuit section and the filter circuit section respectively; and a base plate that is installed so as to cover at least the first space and is electrically connected to the chassis. Here, the chassis includes a first partition wall for partitioning the first space and the second space, the base plate is disposed so as to cover the first space, and includes a second partition wall along the first partition wall, and the second partition wall is disposed between the filter circuit section and the first partition wall in the first space.Type: GrantFiled: December 25, 2015Date of Patent: October 16, 2018Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Keisuke Fukumasu, Hiroki Funato, Yuji Sobu
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Patent number: 9935558Abstract: To achieve reduction in size and reduction in cost of a DC-DC converter apparatus. Rectifier elements and are installed onto a metal base, and a drive circuit board is installed to an upper part of the rectifier element. Each terminal of the rectifier elements and is soldered to the drive circuit board. Three terminals of the rectifier elements are soldered, respectively, to a drive signal wiring pattern, a high-potential-side main current wiring pattern, and a low-potential-side main current wiring pattern of the board. A pair of output terminals of a transformer is connected to at least the pair of high-potential-side main current wiring patterns using high-potential-side metal conductors.Type: GrantFiled: October 1, 2014Date of Patent: April 3, 2018Assignee: Hitachi Automotive Systems, Ltd.Inventors: Tatsuya Nakazawa, Yuji Sobu, Hidenori Shinohara, Yoshiharu Yamashita
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Publication number: 20180019663Abstract: An electric power conversion device includes: an active circuit section emitting noises; an output-side filter circuit section; a chassis including a first space and a second space for housing the active circuit section and the filter circuit section respectively; and a base plate that is installed so as to cover at least the first space and is electrically connected to the chassis. Here, the chassis includes a first partition wall for partitioning the first space and the second space, the base plate is disposed so as to cover the first space, and includes a second partition wall along the first partition wall, and the second partition wall is disposed between the filter circuit section and the first partition wall in the first space.Type: ApplicationFiled: December 25, 2015Publication date: January 18, 2018Applicant: HITACHI AUTOMOTIVE SYSTEMS, LTD.Inventors: Keisuke FUKUMASU, Hiroki FUNATO, Yuji SOBU
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Patent number: 9561728Abstract: To effectively suppress radiation and mixture of noise superimposed on a power line into a connection detection line. A power conversion device includes a connector having a wiring line which transmits DC power; and a housing in which the connector is arranged. The connector has a connection detection wiring line which detects whether the connector is connected with an external circuit. An opening part which connects with the connector is formed in the housing. An annular core formed of a magnetic substance is inserted through the opening part. The annular core is an annular member formed with a through-hole. The wiring line and the connection detection wiring line are introduced into an inside of the housing through the through-hole of the annular core.Type: GrantFiled: April 18, 2014Date of Patent: February 7, 2017Assignee: Hitachi Automotive Systems, Ltd.Inventors: Yuji Sobu, Mikito Komatsu, Tatsuya Nakazawa
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Publication number: 20160248333Abstract: To achieve reduction in size and reduction in cost of a DC-DC converter apparatus. Rectifier elements and are installed onto a metal base, and a drive circuit board is installed to an upper part of the rectifier element. Each terminal of the rectifier elements and is soldered to the drive circuit board. Three terminals of the rectifier elements are soldered, respectively, to a drive signal wiring pattern, a high-potential-side main current wiring pattern, and a low-potential-side main current wiring pattern of the board. A pair of output terminals of a transformer is connected to at least the pair of high-potential-side main current wiring patterns using high-potential-side metal conductors.Type: ApplicationFiled: October 1, 2014Publication date: August 25, 2016Inventors: Tatsuya NAKAZAWA, Yuji SOBU, Hidenori SHINOHARA, Yoshiharu YAMASHITA
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Publication number: 20160114691Abstract: To effectively suppress radiation and mixture of noise superimposed on a power line into a connection detection line. A power conversion device includes a connector having a wiring line which transmits DC power; and a housing in which the connector is arranged. The connector has a connection detection wiring line which detects whether the connector is connected with an external circuit. An opening part which connects with the connector is formed in the housing. An annular core formed of a magnetic substance is inserted through the opening part. The annular core is an annular member formed with a through-hole. The wiring line and the connection detection wiring line are introduced into an inside of the housing through the through-hole of the annular core.Type: ApplicationFiled: April 18, 2014Publication date: April 28, 2016Inventors: Yuji SOBU, Mikito KOMATSU, Tatsuya NAKAZAWA