Patents by Inventor Isao Hoda
Isao Hoda 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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Publication number: 20220354006Abstract: A signal transmission circuit includes: a circuit board stored in a housing; a connector which is mounted on the circuit board and includes a first signal terminal and a first ground terminal; and an integrated circuit which is mounted on the circuit board and includes a second signal terminal and a second ground terminal. The first signal terminal and the second signal terminal are connected to each other by a signal wiring arranged on the circuit board. The first around terminal and the second ground terminal are connected to each other by a ground wiring arranged in a predetermined range including a portion immediately above or immediately below the signal wiring in the circuit board. At least a part of the ground wiring immediately above or immediately below the signal wiring has a high impedance structure formed to be wider than the signal wiring and narrower than a combined width of the first signal terminal and the first ground terminal.Type: ApplicationFiled: May 13, 2020Publication date: November 3, 2022Applicant: HITACHI ASTEMO, LTD.Inventors: Yuki NAKAMURA, Masahiro TOYAMA, Isao HODA, Hiroki FUNATO, Umberto PAOLETTI, Hideyuki SAKAMOTO, Yutaka UEMATSU
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Patent number: 11457548Abstract: An electronic control device includes: a housing accommodating a board on which an electronic component is mounted; and a guard pattern formed on an outer peripheral portion of the board. The guard pattern and a ground pattern of a circuit in the circuit board are connected to each other in a vicinity of an intermediate point of fixed positions where an upper portion of the housing and a lower portion of the housing are fixed to each other.Type: GrantFiled: June 28, 2019Date of Patent: September 27, 2022Assignee: Hitachi Astemo, Ltd.Inventors: Masahiro Toyama, Isao Hoda, Umberto Paoletti, Hideyuki Sakamoto
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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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Patent number: 11303223Abstract: Provided is a detector. The detector includes: one or more detection diodes configured to detect a change in an environment of a detection target; a Y capacitor including a plurality of capacitors separately disposed between one end of the detection diodes and a GND and between the other end of the detection diodes and the GND; and a rectifier circuit disposed at least between one end of the detection diodes and the GND or between the other end of the detection diodes and the GND, connected in series with the Y capacitor, and configured to transmit a common-mode current accompanying noise induced in the detection diodes to the GND and cut off a normal-mode loop current that flows between the plurality of capacitors and the detection diodes.Type: GrantFiled: June 1, 2018Date of Patent: April 12, 2022Assignee: Hitachi Astemo, Ltd.Inventors: Isao Hoda, Jia Li, Hiroki Funato, Ryuji Kurihara
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Patent number: 11257616Abstract: A high-voltage noise filter of a power conversion device includes: a metal housing; an anode bus bar connecting anodes of a power source and a power module; a cathode bus bar connecting cathodes thereof; a first magnetic core having a through hole where the anode bus bar and the cathode bus bar pass through; an X capacitor having one end connected to the anode bus bar, and the other end connected to the cathode bus bar; a first Y capacitor having one end connected to the anode bus bar, and the other end grounded; a second Y capacitor having one end connected to the cathode bus bar, and the other end grounded; and a first cooling unit connected to the first magnetic core and the metal housing. The anode bus bar partly faces the first cooling unit, and the cathode bus bar partly faces the first cooling unit.Type: GrantFiled: December 19, 2019Date of Patent: February 22, 2022Assignee: Hitachi, Ltd.Inventors: Masaki Noda, Hiroki Funato, Isao Hoda, Hitoshi Taniguchi
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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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Publication number: 20210336558Abstract: Provided is a detector. The detector includes: one or more detection diodes configured to detect a change in an environment of a detection target; a Y capacitor including a plurality of capacitors separately disposed between one end of the detection diodes and a GND and between the other end of the detection diodes and the GND; and a rectifier circuit disposed at least between one end of the detection diodes and the GND or between the other end of the detection diodes and the GND, connected in series with the Y capacitor, and configured to transmit a common-mode current accompanying noise induced in the detection diodes to the GND and cut off a normal-mode loop current that flows between the plurality of capacitors and the detection diodes.Type: ApplicationFiled: June 1, 2018Publication date: October 28, 2021Inventors: Isao HODA, Jia LI, Hiroki FUNATO, Ryuji KURIHARA
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Publication number: 20210307216Abstract: An electronic control device includes: a housing accommodating a board on which an electronic component is mounted; and a guard pattern formed on an outer peripheral portion of the board. The guard pattern and a ground pattern of a circuit in the circuit board are connected to each other in a vicinity of an intermediate point of fixed positions where an upper portion of the housing and a lower portion of the housing are fixed to each other.Type: ApplicationFiled: June 28, 2019Publication date: September 30, 2021Inventors: Masahiro TOYAMA, Isao HODA, Umberto PAOLETTI, Hideyuki SAKAMOTO
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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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Publication number: 20200203055Abstract: A high-voltage noise filter of a power conversion device includes: a metal housing; an anode bus bar connecting anodes of a power source and a power module; a cathode bus bar connecting cathodes thereof; a first magnetic core having a through hole where the anode bus bar and the cathode bus bar pass through; an X capacitor having one end connected to the anode bus bar, and the other end connected to the cathode bus bar; a first Y capacitor having one end connected to the anode bus bar, and the other end grounded; a second Y capacitor having one end connected to the cathode bus bar, and the other end grounded; and a first cooling unit connected to the first magnetic core and the metal housing. The anode bus bar partly faces the first cooling unit, and the cathode bus bar partly faces the first cooling unit.Type: ApplicationFiled: December 19, 2019Publication date: June 25, 2020Inventors: Masaki NODA, Hiroki FUNATO, Isao HODA, Hitoshi TANIGUCHI
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Patent number: 10666132Abstract: In some examples, an apparatus includes an inverter with a switching circuit. Furthermore, a first circuit has a first circuit ground and a second circuit has a second circuit ground. For example, the second circuit may be electrically connected to the switching circuit, and the second circuit ground may be electrically connected to the first circuit ground. A first capacitor may be electrically connected between the first circuit ground and a main ground. In addition, a second capacitor may be electrically connected between the second circuit ground and the main ground. Additionally, a first impedance of a first conductive path to the main ground may be greater than a second impedance of a second conductive path to the main ground. The first conductive path may include the first circuit ground and the first capacitor, and the second conductive path may include the second circuit ground and the second capacitor.Type: GrantFiled: March 22, 2018Date of Patent: May 26, 2020Assignee: Hitachi Automotive Systems, Ltd.Inventors: Jia Li, Isao Hoda, Hiroki Funato
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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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Publication number: 20190296637Abstract: In some examples, an apparatus includes an inverter with a switching circuit. Furthermore, a first circuit has a first circuit ground and a second circuit has a second circuit ground. For example, the second circuit may be electrically connected to the switching circuit, and the second circuit ground may be electrically connected to the first circuit ground. A first capacitor may be electrically connected between the first circuit ground and a main ground. In addition, a second capacitor may be electrically connected between the second circuit ground and the main ground. Additionally, a first impedance of a first conductive path to the main ground may be greater than a second impedance of a second conductive path to the main ground. The first conductive path may include the first circuit ground and the first capacitor, and the second conductive path may include the second circuit ground and the second capacitor.Type: ApplicationFiled: March 22, 2018Publication date: September 26, 2019Inventors: Jia LI, Isao HODA, Hiroki FUNATO
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Patent number: 9973289Abstract: The present disclosure generally relates to a signal transmission path evaluation device and method for evaluating EMC resistance of a signal transmission path using a computer system. An operating device of the computer system is input with signal transmission line shape data, signal transmission line path data, signal transmission line shape dispersion data, and margin information for noise input of a communication device connected to the signal transmission line. Calculations are performed including an electric field or a magnetic field in a vicinity of the signal transmission line path from the signal transmission line path data, dispersion of the signal line transmission line shape via a random number, noise waveform at a communication device input from the electric field or the magnetic field in the vicinity of the signal transmission path, error occurrence determination, and error rate from plural time trial results. Information concerning the calculated error rate is output.Type: GrantFiled: March 17, 2017Date of Patent: May 15, 2018Assignee: HITACHI, LTD.Inventors: Hitoshi Taniguchi, Hiroki Funato, Isao Hoda
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Publication number: 20180076911Abstract: The present disclosure generally relates to a signal transmission path evaluation device and method for evaluating EMC resistance of a signal transmission path using a computer system. An operating device of the computer system is input with signal transmission line shape data, signal transmission line path data, signal transmission line shape dispersion data, and margin information for noise input of a communication device connected to the signal transmission line. Calculations are performed including an electric field or a magnetic field in a vicinity of the signal transmission line path from the signal transmission line path data, dispersion of the signal line transmission line shape via a random number, noise waveform at a communication device input from the electric field or the magnetic field in the vicinity of the signal transmission path, error occurrence determination, and error rate from plural time trial results. Information concerning the calculated error rate is output.Type: ApplicationFiled: March 17, 2017Publication date: March 15, 2018Applicant: HITACHI, LTD.Inventors: Hitoshi Taniguchi, Hiroki Funato, Isao Hoda
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Patent number: 9653937Abstract: It is an object of the present invention to provide a power supplying apparatus, a power receiving apparatus, an electrical vehicle, a charging system, and a charging method, the power feeding apparatus improving reliability by suppressing any decrease in charging efficiency and making charging control communication more resistant to high-frequency noise of a switching element. A power supplying apparatus for feeding power to an external apparatus, wherein the power supplying apparatus is characterized in having a power conversion unit, a power supplying unit, a control unit, and a communication unit. The power conversion unit includes a power conversion switching element capable of changing the a switching waveform of the switching element. The power supplying unit supplies power to the external apparatus, the power being generated in the power conversion unit. The communication unit communicates with the external apparatus.Type: GrantFiled: January 27, 2014Date of Patent: May 16, 2017Assignee: Hitachi, Ltd.Inventors: Isao Hoda, Hitoshi Akiyama
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Patent number: 9618480Abstract: An apparatus and method for inspecting the quality of a weld under test in a structure having a plurality of spaced apart welds. Two probes are placed on opposite sides of the structure so that a current path is formed through the weld under test. The probes are energized with alternating current at a known frequency. The magnetic flux generated from the current flow through the probes and at least one of the spaced apart welds is then measured and subsequently compared with magnetic flux data previously determined and representing weld quality.Type: GrantFiled: September 8, 2015Date of Patent: April 11, 2017Assignee: Hitachi, Ltd.Inventors: Isao Hoda, Hua Zeng, Masayoshi Takahashi, Hiroki Funato
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Publication number: 20170067854Abstract: An apparatus and method for inspecting the quality of a weld under test in a structure having a plurality of spaced apart welds. Two probes are placed on opposite sides of the structure so that a current path is formed through the weld under test. The probes are energized with alternating current at a known frequency. The magnetic flux generated from the current flow through the probes and at least one of the spaced apart welds is then measured and subsequently compared with magnetic flux data previously determined and representing weld quality.Type: ApplicationFiled: September 8, 2015Publication date: March 9, 2017Inventors: Isao Hoda, Hua Zeng, Masayoshi Takahashi, Hiroki Funato
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Publication number: 20150303730Abstract: It is an object of the present invention to provide a power supplying apparatus, a power receiving apparatus, an electrical vehicle, a charging system, and a charging method, the power feeding apparatus improving reliability by suppressing any decrease in charging efficiency and making charging control communication more resistant to high-frequency noise of a switching element. A power supplying apparatus for feeding power to an external apparatus, wherein the power supplying apparatus is characterized in having a power conversion unit, a power supplying unit, a control unit, and a communication unit. The power conversion unit includes a for power conversion switching element capable of changing the switching waveform. The power supplying unit supplies power to the external apparatus, the power being generated in the power conversion unit. The communication unit communicates with the external apparatus.Type: ApplicationFiled: January 27, 2014Publication date: October 22, 2015Inventors: Isao Hoda, Hitoshi Akiyama
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Patent number: 8514335Abstract: The present invention provides a method for providing an optimal wireless communication method according to a change in a wireless communication environment. When the reception status is degraded while an HD stream signal, which uses a first wireless method, is transmitted and received, the method scans channels for which radar wave monitoring is not required and switches the transmission/reception to a second wireless method using free channel A. The method further scans channels for which radar wave monitoring is required and, if free channel B has a bandwidth wider than that of channel A is found, monitors channel B and if channel B is not used by a radar wave, switches the channel from channel A to channel B.Type: GrantFiled: April 26, 2010Date of Patent: August 20, 2013Assignee: Hitachi, Ltd.Inventors: Shinichi Murakami, Isao Hoda, Takatoshi Shirosugi