Patents by Inventor Yoshitsugu Koyama
Yoshitsugu Koyama 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: 11391472Abstract: A heat exchange unit includes a heat exchanger, a structure supporting the heat exchanger, an insulating member electrically insulating the heat exchanger from the structure, a compressor electrically connected to the heat exchanger and the structure, and a connection member attached to the heat exchanger. The connection member electrically connects the heat exchanger and the structure. The connection member is provided separately from a first conductive path that electrically connects the compressor and the heat exchanger, and a second conductive path that electrically connects the compressor and the structure.Type: GrantFiled: December 11, 2020Date of Patent: July 19, 2022Assignee: Daikin Industries, Ltd.Inventors: Hiroshi Fuchikami, Makoto Takayanagi, Taichi Koshiji, Takahiro Matsui, Hirotaka Doi, Yoshitsugu Koyama, Yukio Akita
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Publication number: 20210095871Abstract: A heat exchange unit includes a heat exchanger, a structure supporting the heat exchanger, an insulating member electrically insulating the heat exchanger from the structure, a compressor electrically connected to the heat exchanger and the structure, and a connection member attached to the heat exchanger. The connection member electrically connects the heat exchanger and the structure. The connection member is provided separately from a first conductive path that electrically connects the compressor and the heat exchanger, and a second conductive path that electrically connects the compressor and the structure.Type: ApplicationFiled: December 11, 2020Publication date: April 1, 2021Inventors: Hiroshi FUCHIKAMI, Makoto TAKAYANAGI, Taichi KOSHIJI, Takahiro MATSUI, Hirotaka DOI, Yoshitsugu KOYAMA, Yukio AKITA
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Patent number: 10320284Abstract: An inverter device uses an inverter to convert DC voltage supplied from a rectifying component to AC voltage and applies the AC voltage to an inductive load. The inverter device includes a shunt resistor provided on a direct-current link interconnecting the rectifying component and the inverter, a first terminal passing current to the shunt resistor, a second terminal to which the current from the shunt resistor flows, and a printed board having a conductive pattern with first and second conductive pattern components joining the shunt resistor and the first and second terminals, respectively. The first conductive pattern component includes a first central region connecting right and left side ends of the shunt resistor to right and left side ends of the first terminal, and first right and left side protruding regions. A ratio of areas of the first left and right side protruding regions is 0.6 to 1.6.Type: GrantFiled: June 8, 2016Date of Patent: June 11, 2019Assignee: Daikin Industries, Ltd.Inventors: Hirotaka Doi, Hiroshi Doumae, Takuji Koyama, Michiya Takezoe, Keito Kotera, Masahiro Yamamoto, Yoshitsugu Koyama, Sumio Kagimura
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Publication number: 20180191240Abstract: An inverter device uses an inverter to convert DC voltage supplied from a rectifying component to AC voltage and applies the AC voltage to an inductive load. The inverter device includes a shunt resistor provided on a direct-current link interconnecting the rectifying component and the inverter, a first terminal passing current to the shunt resistor, a second terminal to which the current from the shunt resistor flows, and a printed board having a conductive pattern with first and second conductive pattern components joining the shunt resistor and the first and second terminals, respectively. The first conductive pattern component includes a first central region connecting right and left side ends of the shunt resistor to right and left side ends of the first terminal, and first right and left side protruding regions. A ratio of areas of the first left and right side protruding regions is 0.6 to 1.6.Type: ApplicationFiled: June 8, 2016Publication date: July 5, 2018Inventors: Hirotaka DOI, Hiroshi DOUMAE, Takuji KOYAMA, Michiya TAKEZOE, Keito KOTERA, Masahiro YAMAMOTO, Yoshitsugu KOYAMA, Sumio KAGIMURA
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Patent number: 9237653Abstract: For an electronic circuit apparatus including a shunt resistor, provided is a measure for improving the heat dissipation performance of the shunt resistor. The shunt resistor includes electrodes at both ends. One of the two electrodes is connected to a surface-mounting pattern on which the shunt resistor is surface-mounted. A current-generating-side pattern and a current-receiving-side pattern are arranged separately from the surface-mounting pattern. The current-generating-side pattern and the surface-mounting pattern are connected together via a connection member which creates a space between itself and a substrate.Type: GrantFiled: August 30, 2013Date of Patent: January 12, 2016Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Rei Kondou, Mitsuhiro Tanaka, Yoshitsugu Koyama
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Patent number: 9137933Abstract: A refrigeration apparatus includes: an electrical circuit (10) including a power device (14); a refrigerant jacket (30) which is thermally connected to the power device (14), and in which a refrigerant for a refrigeration cycle flows; a refrigerant pipe (20) which carries the refrigerant flowing in the refrigerant jacket (30), and forms a current path (20a, 20b) for grounding the refrigerant jacket (30); and a magnetic body (90) which is attached to the current path (20a, 20b), and generates a predetermined impedance in the current path (20a, 20b).Type: GrantFiled: May 14, 2009Date of Patent: September 15, 2015Assignee: DAIKIN INDUSTRIES, LTD.Inventor: Yoshitsugu Koyama
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Publication number: 20150245490Abstract: For an electronic circuit apparatus including a shunt resistor, provided is a measure for improving the heat dissipation performance of the shunt resistor. The shunt resistor includes electrodes at both ends. One of the two electrodes is connected to a surface-mounting pattern on which the shunt resistor is surface-mounted. A current-generating-side pattern and a current-receiving-side pattern are arranged separately from the surface-mounting pattern. The current-generating-side pattern and the surface-mounting pattern are connected together via a connection member which creates a space between itself and a substrate.Type: ApplicationFiled: August 30, 2013Publication date: August 27, 2015Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Rei Kondou, Mitsuhiro Tanaka, Yoshitsugu Koyama
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Patent number: 8008886Abstract: A power converter is provided with a rectifying circuit, an inverter circuit, and a common mode filter including a common mode choke coil and a capacitor. The switching frequency of a PWM rectifying circuit is set at three times the switching frequency of a PWM inverter. Alternatively, the resonance frequency of the common mode filter is set at twice the carrier frequency of the rectifying circuit or the PWM inverter circuit or more.Type: GrantFiled: September 30, 2005Date of Patent: August 30, 2011Assignee: Daikin Industries, Ltd.Inventors: Reiji Kawashima, Yoshitsugu Koyama
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Publication number: 20110072833Abstract: A refrigeration apparatus includes: an electrical circuit (10) including a power device (14); a refrigerant jacket (30) which is thermally connected to the power device (14), and in which a refrigerant for a refrigeration cycle flows; a refrigerant pipe (20) which carries the refrigerant flowing in the refrigerant jacket (30), and forms a current path (20a, 20b) for grounding the refrigerant jacket (30); and a magnetic body (90) which is attached to the current path (20a, 20b), and generates a predetermined impedance in the current path (20a, 20b).Type: ApplicationFiled: May 14, 2009Publication date: March 31, 2011Inventor: Yoshitsugu Koyama
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Publication number: 20080284367Abstract: A power converter is provided with a rectifying circuit, an inverter circuit, and a common mode filter including a common mode choke coil and a capacitor. The switching frequency of a PWM rectifying circuit is set at three times the switching frequency of a PWM inverter. Alternatively, the resonance frequency of the common mode filter is set at twice the carrier frequency of the rectifying circuit or the PWM inverter circuit or more.Type: ApplicationFiled: September 30, 2005Publication date: November 20, 2008Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Reiji Kawashima, Yoshitsugu Koyama