Patents by Inventor Keito KOTERA
Keito KOTERA 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: 11750112Abstract: To achieve high density integration of components while securing an insulation distance between a bootstrap capacitor and an intelligent power module. In a printed wiring board, a region where a capacitor is mounted is located in a region where an intelligent power module is mounted. Therefore, the capacitor mounted on the printed wiring board is placed between the printed wiring board and the intelligent power module.Type: GrantFiled: December 28, 2022Date of Patent: September 5, 2023Assignee: Daikin Industries, Ltd.Inventors: Masahide Fujiwara, Nobuyasu Hiraoka, Keito Kotera, Taku Itou, Masaki Kouno, Reiji Kawashima
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Publication number: 20230145005Abstract: To achieve high density integration of components while securing an insulation distance between a bootstrap capacitor and an intelligent power module. In a printed wiring board, a region where a capacitor is mounted is located in a region where an intelligent power module is mounted. Therefore, the capacitor mounted on the printed wiring board is placed between the printed wiring board and the intelligent power module.Type: ApplicationFiled: December 28, 2022Publication date: May 11, 2023Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Masahide FUJIWARA, Nobuyasu HIRAOKA, Keito KOTERA, Taku ITOU, Masaki KOUNO, Reiji KAWASHIMA
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Publication number: 20220128286Abstract: The present disclosure provides an air conditioner including a compressor and a drive circuit configured to drive the compressor. The drive circuit includes an AC path, a rectifier connected to the AC path, a DC path on an output side of the rectifier, a smoothing capacitor connected to the DC path, an inverter connected to the DC path, a switch disposed on an electric path from the AC path to the smoothing capacitor, and a controller configured to close and open the switch during a preheating operation of supplying electricity for preheating the compressor via the inverter.Type: ApplicationFiled: November 14, 2019Publication date: April 28, 2022Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Keito KOTERA, Masahide FUJIWARA, Hironori OGAWA, Takamune OKUI, Yuuko NAKANISHI, Nobuyasu HIRAOKA
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Patent number: 10756647Abstract: A power converter includes: a converter circuit converting an alternating current to a direct current; a reactor electrically connected to one of output terminals of the converter circuit; a capacitor electrically connected to the other output terminal of the converter circuit and the reactor; and an inverter circuit electrically connected to the capacitor converting the direct current to an alternating current. The capacitor is a film capacitor. The capacitor and the reactor are mounted on an identical circuit board.Type: GrantFiled: January 22, 2018Date of Patent: August 25, 2020Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Masahide Fujiwara, Nobuyasu Hiraoka, Keito Kotera, Shinichi Ishizeki
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Patent number: 10739019Abstract: A converter, a first switch, a second switch, and an inverter are disposed in that order along a second direction, at a first position in a first direction. A reactor and a capacitor are disposed in that order along the second direction, at a second position in the first direction. Energy is stored in the reactor via the first switch. The capacitor is discharged via the second switch. At least one of a set of the reactor and the converter and a set of the capacitor and the inverter is disposed side by side along the first direction.Type: GrantFiled: May 25, 2018Date of Patent: August 11, 2020Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Nobuyasu Hiraoka, Shinichi Ishizeki, Keito Kotera, Masahide Fujiwara
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Patent number: 10619878Abstract: An inverter driver of an air conditioner drives an inverter of an actuator that actuates the air conditioner. The inverter driver includes a drive circuit outputting a drive signal to the inverter, a microcomputer controlling the drive circuit, a first mechanical relay connected to the drive circuit, and an inverter control power supply continually supplying power to the microcomputer. The first mechanical relay is capable of cutting off an inverter drive power supply of the drive circuit or cutting off the drive signal of the drive circuit. The first mechanical relay cuts off the inverter drive power supply of the drive circuit or the drive signal of the drive circuit when an abnormality in the air conditioner has been sensed and stopping the driving of the actuator has been requested.Type: GrantFiled: March 28, 2016Date of Patent: April 14, 2020Assignee: Daikin Industries, Ltd.Inventors: Hirotaka Doi, Hiroshi Doumae, Takuji Koyama, Nobuyasu Hiraoka, Michiya Takezoe, Sumio Kagimura, Keito Kotera
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Publication number: 20200112248Abstract: A converter, a first switch, a second switch, and an inverter are disposed in that order along a second direction, at a first position in a first direction. A reactor and a capacitor are disposed in that order along the second direction, at a second position in the first direction. Energy is stored in the reactor via the first switch. The capacitor is discharged via the second switch. At least one of a set of the reactor and the converter and a set of the capacitor and the inverter is disposed side by side along the first direction.Type: ApplicationFiled: May 25, 2018Publication date: April 9, 2020Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Nobuyasu HIRAOKA, Shinichi ISHIZEKI, Keito KOTERA, Masahide FUJIWARA
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Patent number: 10495327Abstract: An inverter apparatus variably controls an operation frequency of an electric motor provided in a refrigerating device, and includes: a printed wiring board; a power device attached to one surface of the printed wiring board, the power device including a converter circuit and an inverter circuit; a reactor arranged on a side of the one surface of the printed wiring board, at least a part of the reactor being arranged within a plane projection area of the printed wiring board; and a cooler for cooling the power device and the reactor, the cooler being arranged such that the power device and the reactor are interposed between the cooler and the printed wiring board.Type: GrantFiled: June 6, 2016Date of Patent: December 3, 2019Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka Doi, Hiroshi Doumae, Nobuyasu Hiraoka, Sumio Kagimura, Keito Kotera
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Publication number: 20190341860Abstract: A power converter includes: a converter circuit converting an alternating current to a direct current; a reactor electrically connected to one of output terminals of the converter circuit; a capacitor electrically connected to the other output terminal of the converter circuit and the reactor; and an inverter circuit electrically connected to the capacitor converting the direct current to an alternating current. The capacitor is a film capacitor. The capacitor and the reactor are mounted on an identical circuit board.Type: ApplicationFiled: January 22, 2018Publication date: November 7, 2019Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Masahide FUJIWARA, Nobuyasu HIRAOKA, Keito KOTERA, Shinichi ISHIZEKI
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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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Patent number: 10038256Abstract: A module-terminal block connection structure includes: a printed wiring board; a terminal block which is disposed on one surface of the printed wiring board and is formed into a three-dimensional shape by a conductive material, the terminal block being fixed to the printed wiring board; a power module which is disposed on the other surface (rear surface) of the printed wiring board and includes an electric circuit and a press-fit type lead pin used as a circuit terminal; and a conductive portion which is electrically connected to the terminal block, includes a hole (through-hole) for press-inserting the lead pin thereinto, and is electrically connected to the power module while the lead pin is press-inserted into the hole.Type: GrantFiled: November 4, 2015Date of Patent: July 31, 2018Assignee: Daikin Industries, Ltd.Inventors: Keito Kotera, Hirotaka Doi, Nobuyasu Hiraoka, Hiroshi Doumae, Michiya Takezoe, Takuji Koyama
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Publication number: 20180187905Abstract: An inverter apparatus variably controls an operation frequency of an electric motor provided in a refrigerating device, and includes: a printed wiring board; a power device attached to one surface of the printed wiring board, the power device including a converter circuit and an inverter circuit; a reactor arranged on a side of the one surface of the printed wiring board, at least a part of the reactor being arranged within a plane projection area of the printed wiring board; and a cooler for cooling the power device and the reactor, the cooler being arranged such that the power device and the reactor are interposed between the cooler and the printed wiring board.Type: ApplicationFiled: June 6, 2016Publication date: July 5, 2018Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka Doi, Hiroshi Doumae, Nobuyasu Hiraoka, Sumio Kagimura, Keito Kotera
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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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Publication number: 20180073765Abstract: An inverter driver of an air conditioner drives an inverter of an actuator that actuates the air conditioner. The inverter driver includes a drive circuit outputting a drive signal to the inverter, a microcomputer controlling the drive circuit, a first mechanical relay connected to the drive circuit, and an inverter control power supply continually supplying power to the microcomputer. The first mechanical relay is capable of cutting off an inverter drive power supply of the drive circuit or cutting off the drive signal of the drive circuit. The first mechanical relay cuts off the inverter drive power supply of the drive circuit or the drive signal of the drive circuit when an abnormality in the air conditioner has been sensed and stopping the driving of the actuator has been requested.Type: ApplicationFiled: March 28, 2016Publication date: March 15, 2018Inventors: Hirotaka DOI, Hiroshi DOUMAE, Takuji KOYAMA, Nobuyasu HIRAOKA, Michiya TAKEZOE, Sumio KAGIMURA, Keito KOTERA
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Publication number: 20170324173Abstract: A module-terminal block connection structure includes: a printed wiring board; a terminal block which is disposed on one surface of the printed wiring board and is formed into a three-dimensional shape by a conductive material, the terminal block being fixed to the printed wiring board; a power module which is disposed on the other surface (rear surface) of the printed wiring board and includes an electric circuit and a press-fit type lead pin used as a circuit terminal; and a conductive portion which is electrically connected to the terminal block, includes a hole (through-hole) for press-inserting the lead pin thereinto, and is electrically connected to the power module while the lead pin is press-inserted into the hole.Type: ApplicationFiled: November 4, 2015Publication date: November 9, 2017Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Keito KOTERA, Hirotaka DOI, Nobuyasu HIRAOKA, Hiroshi DOUMAE, Michiya TAKEZOE, Takuji KOYAMA