Patents by Inventor Ryuichi Takezawa
Ryuichi Takezawa 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).
-
Patent number: 11133773Abstract: A power conversion device includes a cooling fan, a cooling fan control unit that controls the drive amount of the cooling fan, and an electrolytic capacitor whose life varies according to the drive amount of the cooling fan. The cooling fan control unit controls the drive amount based on the relationship between the drive amount, the life of the cooling fan, and the life of the electrolytic capacitor.Type: GrantFiled: April 6, 2018Date of Patent: September 28, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Shinya Nakagawa, Shizuri Tamura, Ryuichi Takezawa
-
Publication number: 20200403554Abstract: A power conversion device includes a cooling fan, a cooling fan control unit that controls the drive amount of the cooling fan, and an electrolytic capacitor whose life varies according to the drive amount of the cooling fan. The cooling fan control unit controls the drive amount based on the relationship between the drive amount, the life of the cooling fan, and the life of the electrolytic capacitor.Type: ApplicationFiled: April 6, 2018Publication date: December 24, 2020Applicant: Mitsubishi Electric CorporationInventors: Shinya NAKAGAWA, Shizuri TAMURA, Ryuichi TAKEZAWA
-
Patent number: 9871482Abstract: A power conversion device includes a high-pass filter for extracting an AC component of voltage Vdc of a DC link section, a multiplier for multiplying output VdcAC of the high-pass filter by a first gain K1 and outputting the result, a multiplier for multiplying output of the multiplier by a second gain K2 and outputting the result as a d-axis voltage correction signal vdcmp*, and a multiplier for multiplying output of the multiplier by a third gain K3 and outputting the result as a q-axis voltage correction signal vqcmp*. The gate signal generation section generates gate signals on the basis of a signal vd1 obtained by adding the d-axis voltage correction signal vdcmp* to a d-axis voltage command value vd* and a signal vq1 obtained by adding the q-axis voltage correction signal vqcmp* to a q-axis voltage command value vq*.Type: GrantFiled: June 15, 2015Date of Patent: January 16, 2018Assignee: Mitsubishi Electric CorporationInventors: Shuta Ishikawa, Masanori Kato, Shotaro Marumoto, Ryuichi Takezawa, Shunichi Nishimura
-
Patent number: 9795067Abstract: An electronic apparatus includes heat generating components accommodated in a sealed housing section of a housing, an internal-side heat exchanger and an external-side heat exchanger on opposing sides of a wall of the housing, an external-side heat exchanger for heat generating components for heat exchange between the heat generating components and air outside the housing section, and an internal fan. A high-heat generating component generating the most heat contacts the inner surface and opposed to the external-side heat exchanger for heat generating components. Heat exchange between the high-heat generating component and air outside the housing section is effected via the external-side heat exchanger for heat generating components. Heat exchange between air inside the housing section and air outside the housing section is effected via the internal-side heat exchanger and the external-side heat exchanger.Type: GrantFiled: April 3, 2015Date of Patent: October 17, 2017Assignee: Mitsubishi Electric CorporationInventors: Ryuichi Takezawa, Kumi Aoki
-
Publication number: 20170264225Abstract: A power conversion device includes a high-pass filter for extracting an AC component of voltage Vdc of a DC link section, a multiplier for multiplying output VdcAC of the high-pass filter by a first gain K1 and outputting the result, a multiplier for multiplying output of the multiplier by a second gain K2 and outputting the result as a d-axis voltage correction signal vdcmp*, and a multiplier for multiplying output of the multiplier by a third gain K3 and outputting the result as a q-axis voltage correction signal vqcmp*. The gate signal generation section generates gate signals on the basis of a signal vd1 obtained by adding the d-axis voltage correction signal vdcmp* to a d-axis voltage command value vd* and a signal vq1 obtained by adding the q-axis voltage correction signal vqcmp* to a q-axis voltage command value vq*.Type: ApplicationFiled: June 15, 2015Publication date: September 14, 2017Applicant: Mitsubishi Electric CorporationInventors: Shuta ISHIKAWA, Masanori KATO, Shotaro MARUMOTO, Ryuichi TAKEZAWA, Shunichi NISHIMURA
-
Publication number: 20170188488Abstract: An electronic apparatus includes a housing including a sealable housing section, heat generating components accommodated in the housing section, an internal-side heat exchanger contacting one inner surface of one wall of the housing, an external-side heat exchanger contacting one outer surface of the wall and opposed to the internal-side heat exchanger, an external-side heat exchanger for heat generating components for heat exchange between the heat generating components and air outside the housing section, and an internal fan. A high-heat generating component generating the most heat contacts the inner surface and opposed to the external-side heat exchanger for heat generating components. Heat exchange between the high-heat generating component and air outside the housing section is effected via the external-side heat exchanger for heat generating components.Type: ApplicationFiled: April 3, 2015Publication date: June 29, 2017Applicant: Mitsubishi Electric CorporationInventors: Ryuichi TAKEZAWA, Kumi AOKI
-
Patent number: 9590490Abstract: The present invention provides an inrush current suppression circuit that is provided in an electric power conversion apparatus and suppresses inrush current that occurs when power is turned on, the electric power conversion apparatus including an inverter circuit and a drive power circuit that generates direct voltages of two levels as drive voltages, wherein the inrush current suppression circuit includes: an inrush current prevention resistor disposed between a converter circuit that generates DC power to be supplied to the inverter circuit and a smoothing circuit; a relay connected in parallel to the inrush current prevention resistor; and a relay control circuit that applies to the relay a higher direct voltage to shift the relay to a closed state, and after the relay is set to the closed state, applies to the relay a lower direct voltage to retain the closed state.Type: GrantFiled: May 22, 2014Date of Patent: March 7, 2017Assignee: Mitsubishi Electric CorporationInventors: Ryuichi Takezawa, Kotaro Ono
-
Publication number: 20160254740Abstract: The present invention provides an inrush current suppression circuit that is provided in an electric power conversion apparatus and suppresses inrush current that occurs when power is turned on, the electric power conversion apparatus including an inverter circuit and a drive power circuit that generates direct voltages of two levels as drive voltages, wherein the inrush current suppression circuit includes: an inrush current prevention resistor disposed between a converter circuit that generates DC power to be supplied to the inverter circuit and a smoothing circuit; a relay connected in parallel to the inrush current prevention resistor; and a relay control circuit that applies to the relay a higher direct voltage to shift the relay to a closed state, and after the relay is set to the closed state, applies to the relay a lower direct voltage to retain the closed state.Type: ApplicationFiled: May 22, 2014Publication date: September 1, 2016Applicant: Mitsubishi Electric CorporationInventors: Ryuichi TAKEZAWA, Kotaro ONO
-
Patent number: 9399038Abstract: A method for preventing or treating a disease selected from the group consisting of visceral pain, inflammatory pain, osteoarthritis pain, neuropathic pain, and fibromyalgia in a subject in need thereof, comprising administering to said subject an effective amount of the compound of the following formula (I) or a salt thereof: wherein R1, R2, R3, R4, R5, X and n are as described herein.Type: GrantFiled: January 23, 2015Date of Patent: July 26, 2016Assignee: Astellas Pharma Inc.Inventors: Tsukasa Ishihara, Kazuhiro Ikegai, Ikumi Kuriwaki, Hiroyuki Hisamichi, Nobuaki Takeshita, Ryuichi Takezawa
-
Patent number: 9124204Abstract: An inverter device includes a rectifier circuit that rectifies alternating-current power supplied from a main power supply and generates direct-current power, a control power supply circuit that generates direct-current power for control using at least one of the generated direct-current power and direct-current power supplied from an external power supply, and a control unit that receives the generated direct-current power for control and performs a predetermined control operation. The control power supply circuit includes an insulation transformer including a primary side and second side winding wires, a first control power supply capacitor connected to the secondary side winding wire via a first diode, an external power supply capacitor connected to the first control power supply capacitor via a second diode and connected to a terminal, to which the external power supply is connected, via a third diode, and a second control power supply capacitor connected to the external power supply capacitor.Type: GrantFiled: May 18, 2012Date of Patent: September 1, 2015Assignee: Mitsubishi Electric CorporationInventor: Ryuichi Takezawa
-
Publication number: 20150133433Abstract: A method for preventing or treating a disease selected from the group consisting of visceral pain, inflammatory pain, osteoarthritis pain, neuropathic pain, and fibromyalgia in a subject in need thereof, comprising administering to said subject an effective amount of the compound of the following formula (I) or a salt thereof: wherein R1, R2, R3, R4, R5, X and n are as described herein.Type: ApplicationFiled: January 23, 2015Publication date: May 14, 2015Applicant: ASTELLAS PHARMA INC.Inventors: Tsukasa ISHIHARA, Kazuhiro IKEGAI, Ikumi KURIWAKI, Hiroyuki HISAMICHI, Nobuaki TAKESHITA, Ryuichi TAKEZAWA
-
Patent number: 8981119Abstract: The present invention is directed to compounds of Formula I: wherein R1, R2, R3, R4, R5, X and n are described herein. These compounds and their pharmaceutically acceptable salts thereof are useful as IK1 channel activators.Type: GrantFiled: June 6, 2014Date of Patent: March 17, 2015Assignee: Astellas Pharma Inc.Inventors: Tsukasa Ishihara, Kazuhiro Ikegai, Ikumi Kuriwaki, Hiroyuki Hisamichi, Nobuaki Takeshita, Ryuichi Takezawa
-
Publication number: 20150048767Abstract: An inverter device includes a rectifier circuit that rectifies alternating-current power supplied from a main power supply and generates direct-current power, a control power supply circuit that generates direct-current power for control using at least one of the generated direct-current power and direct-current power supplied from an external power supply, and a control unit that receives the generated direct-current power for control and performs a predetermined control operation. The control power supply circuit includes an insulation transformer including a primary side and second side winding wires, a first control power supply capacitor connected to the secondary side winding wire via a first diode, an external power supply capacitor connected to the first control power supply capacitor via a second diode and connected to a terminal, to which the external power supply is connected, via a third diode, and a second control power supply capacitor connected to the external power supply capacitor.Type: ApplicationFiled: May 18, 2012Publication date: February 19, 2015Applicant: Mitsubishi Electric CorporationInventor: Ryuichi Takezawa
-
Patent number: 8922052Abstract: A power supply device generating source powers to be outputted to an inverter and external supply destinations includes: a first power supply transformer including a first primary winding and a plurality of first secondary windings wound on an outer side of the first primary winding; and a second power supply transformer including a second primary winding electrically connected to one of the first secondary windings and a plurality of second secondary windings wound on an outer side of the second primary winding. The second secondary windings are connected to the external supply destinations. The first secondary windings include an upper gate winding connected to an upper-gate power supply circuit for switching on and off a switching element of an upper arm of the inverter, and the upper gate winding is wound on an outermost side to be separated away from the one of the first secondary windings.Type: GrantFiled: May 18, 2012Date of Patent: December 30, 2014Assignee: Mitsubishi Electric CorporationInventor: Ryuichi Takezawa
-
Publication number: 20140364421Abstract: [Problem] A compound which is useful as an IK1 channel activator is provided. [Means for Solution] As a result of studies on the IK1 channel activator, the present inventors have found that a benzothiophene compound shows effectiveness on visceral pain, inflammatory pain, osteoarthritis pain, neuropathic pain, or fibromyalgia, thereby completing the invention. A compound of the invention has an IK1 channel activation effect, and can also be used as an agent for preventing and/or treating visceral pain, inflammatory pain, osteoarthritis pain, neuropathic pain, or fibromyalgia. In addition, the IK1 channel activator can be used as an agent for preventing and/or treating inflammatory pain, osteoarthritis pain, neuropathic pain, and fibromyalgia.Type: ApplicationFiled: June 6, 2014Publication date: December 11, 2014Applicant: ASTELLAS PHARMA INC.Inventors: Tsukasa ISHIHARA, Kazuhiro IKEGAI, Ikumi KURIWAKI, Hiroyuki HISAMICHI, Nobuaki TAKESHITA, Ryuichi TAKEZAWA
-
Patent number: 8878386Abstract: A power supply device generating source powers to be outputted to an inverter and external supply destinations includes: a first power supply transformer including a first primary winding and a plurality of first secondary windings wound on an outer side of the first primary winding; and a second power supply transformer including a second primary winding electrically connected to one of the first secondary windings and a plurality of second secondary windings wound on an outer side of the second primary winding. The second secondary windings are connected to the external supply destinations. The first secondary windings include an upper gate winding connected to an upper-gate power supply circuit for switching on and off a switching element of an upper arm of the inverter, and the upper gate winding is wound on an outermost side to be separated away from the one of the first secondary windings.Type: GrantFiled: May 18, 2012Date of Patent: November 4, 2014Assignee: Mitsubishi Electric CorporationInventor: Ryuichi Takezawa
-
Publication number: 20130307332Abstract: A power supply device generating source powers to be outputted to an inverter and external supply destinations includes: a first power supply transformer including a first primary winding and a plurality of first secondary windings wound on an outer side of the first primary winding; and a second power supply transformer including a second primary winding electrically connected to one of the first secondary windings and a plurality of second secondary windings wound on an outer side of the second primary winding. The second secondary windings are connected to the external supply destinations. The first secondary windings include an upper gate winding connected to an upper-gate power supply circuit for switching on and off a switching element of an upper arm of the inverter, and the upper gate winding is wound on an outermost side to be separated away from the one of the first secondary windings.Type: ApplicationFiled: May 18, 2012Publication date: November 21, 2013Applicant: MITSUBISHI ELECTRIC CORPORATIONInventor: Ryuichi Takezawa
-
Patent number: 7842702Abstract: N-(1H-tetrazol-5-yl)-1-phenoxy-4H-quinolizin-4-one-3-carboxamide is effective for treating IBS. In addition, IBS may be effectively treated with N-(1H-tetrazol-5-yl)-1-phenoxy-4H-quinolizin-4-one-3-carboxamide when used concomitantly with at least one of various serotonin 5-HT3 receptor antagonists.Type: GrantFiled: February 7, 2008Date of Patent: November 30, 2010Assignee: Astellas Pharma Inc.Inventors: Ryuichi Takezawa, Hitoshi Doihara, Hiroyuki Ito, Jotaro Suzuki
-
Publication number: 20080188512Abstract: N-(1H-tetrazol-5-yl)-1-phenoxy-4H-quinolizin-4-one-3-carboxamide is effective for treating IBS. In addition, IBS may be effectively treated with N-(1H-tetrazol-5-yl)-1-phenoxy-4H-quinolizin-4-one-3-carboxamide when used concomitantly with at least one of various serotonin 5-HT3 receptor antagonists.Type: ApplicationFiled: February 7, 2008Publication date: August 7, 2008Applicant: Astellas Pharma Inc.Inventors: Ryuichi Takezawa, Hitoshi Doihara, Hiroyuki Ito, Jotaro Suzuki