Patents by Inventor Taichiro Tamida
Taichiro Tamida 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: 20240039419Abstract: A power source device includes a capacitive load; and an AC power source, as a voltage source, which applies AC voltage to the capacitive load. A series circuit composed of an inductor and a capacitor is connected to the AC power source. A series circuit composed of a load inductor and the capacitive load is connected in parallel to one of the inductor or the capacitor. If an inductance of the inductor is defined as Lp, a capacitance of the capacitor is defined as Cp, an inductance of the load inductor is defined as Ls, an equivalent capacitance of the capacitive load is defined as Cs, and a frequency of the AC power source is defined as fv, the following expressions are satisfied, 0.8/((2?·fv){circumflex over (?)}2)<Lp·Cp<1.2/((2?·fv){circumflex over (?)}2) 0.8/((2?·fv){circumflex over (?)}2)<Ls·Cs<1.2/((2?·fv){circumflex over (?)}2).Type: ApplicationFiled: January 27, 2021Publication date: February 1, 2024Applicant: Mitsubishi Electric CorporationInventors: Taichiro TAMIDA, Shingo TSUDA, Daisuke TAKAUCHI, Takashi KUMAGAI
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Patent number: 11888485Abstract: A pulse power supply device includes pulse power supplies each of which outputs a monopolar pulse voltage, and transformers. The transformers include primary windings, secondary windings, and tertiary windings, and one pulse power supply is connected to one primary winding on a one-to-one basis. The secondary windings are sequentially connected in series, and a load is connected to both ends of the secondary windings. The tertiary windings are sequentially connected in series, and a magnetic reset circuit is connected to both ends of the tertiary windings. The magnetic reset circuit includes a magnetic reset power supply and an impedance changing circuit that is for limiting an induced current that can be caused to flow by a voltage induced in the tertiary windings. An impedance changing circuit is configured to be able to change an impedance.Type: GrantFiled: June 17, 2020Date of Patent: January 30, 2024Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Shingo Tsuda, Taichiro Tamida
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Publication number: 20230188123Abstract: A pulse power supply device includes pulse power supplies each of which outputs a monopolar pulse voltage, and transformers. The transformers include primary windings, secondary windings, and tertiary windings, and one pulse power supply is connected to one primary winding on a one-to-one basis. The secondary windings are sequentially connected in series, and a load is connected to both ends of the secondary windings. The tertiary windings are sequentially connected in series, and a magnetic reset circuit is connected to both ends of the tertiary windings. The magnetic reset circuit includes a magnetic reset power supply and an impedance changing circuit that is for limiting an induced current that can be caused to flow by a voltage induced in the tertiary windings. An impedance changing circuit is configured to be able to change an impedance.Type: ApplicationFiled: June 17, 2020Publication date: June 15, 2023Applicant: Mitsubishi Electric CorporationInventors: Shingo TSUDA, Taichiro TAMIDA
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Patent number: 11594981Abstract: A power supply device includes: “m×n” switching elements; capacitors connected in series to corresponding ones of the switching elements and forming “m×n” series circuits; a charger charging the capacitors; “m” transformers in which primary windings are connected to both ends of corresponding ones of “m” parallel circuits formed by connecting “n” units of the series circuits in parallel to one another with the polarity aligned; a current detection unit detecting, as a detected current value, current flowing through a multistage series circuit in which secondary windings of the transformers are sequentially connected in series so that both ends of the circuit serve as output terminals; a control unit outputting a command signal generated based on the detected current value and a current command being a target value of the current output from the output terminals; and a drive unit driving the switching elements and the charger based on the command signal.Type: GrantFiled: May 20, 2019Date of Patent: February 28, 2023Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Shingo Tsuda, Taichiro Tamida
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Publication number: 20220103093Abstract: A power supply device includes: “m×n” switching elements; capacitors connected in series to corresponding ones of the switching elements and forming “m×n” series circuits; a charger charging the capacitors; “m” transformers in which primary windings are connected to both ends of corresponding ones of “m” parallel circuits formed by connecting “n” units of the series circuits in parallel to one another with the polarity aligned; a current detection unit detecting, as a detected current value, current flowing through a multistage series circuit in which secondary windings of the transformers are sequentially connected in series so that both ends of the circuit serve as output terminals; a control unit outputting a command signal generated based on the detected current value and a current command being a target value of the current output from the output terminals; and a drive unit driving the switching elements and the charger based on the command signal.Type: ApplicationFiled: May 20, 2019Publication date: March 31, 2022Applicant: Mitsubishi Electric CorporationInventors: Shingo TSUDA, Taichiro TAMIDA
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Patent number: 11079444Abstract: An insulation detector for highly accurately detecting or measuring, with a simple configuration, insulation resistance of a load or an apparatus to a ground or a housing and connected to an electric apparatus including one or both of an intra-apparatus capacitor and a battery, the insulation detector including an intra-insulation detector capacitor, a voltage detecting unit that detects a voltage of the intra-insulation detector capacitor, and a current-path forming switch for connecting the ground or the housing, the intra-apparatus capacitor, and the intra-insulation detector capacitor in series and forming a current path including insulation resistance of the electric apparatus. The insulation detector measures the insulation resistance by measuring a time constant of a change in the voltage of the intra-insulation detector capacitor.Type: GrantFiled: August 7, 2018Date of Patent: August 3, 2021Assignee: Mitsubishi Electric CorporationInventors: Taichiro Tamida, Masayuki Uematsu, Akira Tanabe, Yoshitomo Hayashi, Yoji Tsutsumishita, Kosuke Tsujikawa
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Patent number: 11020823Abstract: A laser diode driving power source of a laser machining device that radiates laser light emitted from an LD to a workpiece to machine the workpiece includes a power converter including a switching device, to supply a current to the LD, and a control unit to control a switching operation of the switching device. A value smaller than a value that is n times a time constant for laser machining is set as a switching period of the switching device in the control unit, the n is larger than 1, and the time constant for laser machining is a value obtained by dividing a surface roughness required for machining of the workpiece by a moving velocity of the workpiece.Type: GrantFiled: February 14, 2017Date of Patent: June 1, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Taichiro Tamida, Shingo Tsuda, Teruaki Fukuoka, Hiroshi Ikarashi, Akihiko Iwata, Takeshi Morimoto
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Patent number: 10907606Abstract: An ignition device according to the present invention includes: an ignition plug, which includes a first electrode, a second electrode, and a dielectric body arranged between the electrodes; an AC power supply configured to generate an AC voltage to be applied between the electrodes; a thermal plasma detection portion configured to output a thermal plasma occurrence signal when thermal plasma has occurred between the electrodes; and an application time period determination portion configured to determine an application time period for the AC voltage during one cycle of the internal combustion engine in advance before the application, and when the thermal plasma occurrence signal is received while the AC voltage is being applied based on the application time period, change the application time period so as to shorten the application time period.Type: GrantFiled: May 24, 2018Date of Patent: February 2, 2021Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro Inoue, Taichiro Tamida, Ryota Asakura, Tomokazu Sakashita, Takashi Hashimoto
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Patent number: 10782260Abstract: Provided is an electrostatic capacitance detection device including: an electrode pair including a pair of electrodes, the electrode pair being arranged inside a compressor configured to compress refrigerant; a capacitor being connected in series to the electrode pair; an inverter having one of power lines connected to one end of series-connected electrode pair and capacitor, and is configured to drive the compressor, the power lines being used for driving the compressor; and a voltage detecting unit configured to measure a voltage between the pair of electrodes of the electrode pair.Type: GrantFiled: June 8, 2017Date of Patent: September 22, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Taichiro Tamida, Takahiro Inoue, Takashi Hashimoto, Akihiko Iwata, Shuhei Koyama, Takahiko Kobayashi
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Publication number: 20200290155Abstract: A laser diode driving power source of a laser machining device that radiates laser light emitted from an LD to a workpiece to machine the workpiece includes a power converter including a switching device, to supply a current to the LD, and a control unit to control a switching operation of the switching device. A value smaller than a value that is n times a time constant for laser machining is set as a switching period of the switching device in the control unit, the n is larger than 1, and the time constant for laser machining is a value obtained by dividing a surface roughness required for machining of the workpiece by a moving velocity of the workpiece.Type: ApplicationFiled: February 14, 2017Publication date: September 17, 2020Applicant: Mitsubishi Electric CorporationInventors: Taichiro TAMIDA, Shingo TSUDA, Teruaki FUKUOKA, Hiroshi IKARASHI, Akihiko IWATA, Takeshi MORIMOTO
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Publication number: 20200271084Abstract: An ignition device according to the present invention includes: an ignition plug, which includes a first electrode, a second electrode, and a dielectric body arranged between the electrodes; an AC power supply configured to generate an AC voltage to be applied between the electrodes; a thermal plasma detection portion configured to output a thermal plasma occurrence signal when thermal plasma has occurred between the electrodes; and an application time period determination portion configured to determine an application time period for the AC voltage during one cycle of the internal combustion engine in advance before the application, and when the thermal plasma occurrence signal is received while the AC voltage is being applied based on the application time period, change the application time period so as to shorten the application time period.Type: ApplicationFiled: May 24, 2018Publication date: August 27, 2020Applicant: Mitsubishi Electric CorporationInventors: Takahiro INOUE, Taichiro TAMIDA, Ryota ASAKURA, Tomokazu SAKASHITA, Takashi HASHIMOTO
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Patent number: 10529478Abstract: An air core type reactor unit, includes a first insulating plate which is provided with a first insulating spacer on one side, a first ferromagnetic member metal plate fixed to an insulating plate, two or more air core coils each having an air core part and formed of coil layers with the separation of an air gap, a second insulating plate, which is provided with a second insulating spacer on another side thereof and has a width smaller than an inside diameter of the coil, to incorporate more air into, a second ferromagnetic member metal plate fixed to an insulating plate, and an insulating stick passing through the air core part of the air core coils, wherein the air core coils are arranged in parallel, and held and fixed between the first insulating plate and the second insulating plate through the first insulating spacer and the second insulating spacer.Type: GrantFiled: August 9, 2016Date of Patent: January 7, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Toshihiro Yoshida, Hajime Nakatani, Daisuke Takauchi, Takashi Kumagai, Kenji Shimohata, Taichiro Tamida
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Patent number: 10522971Abstract: A laser diode-driving power supply includes a constant current source that supplies current to LDs, a switching element connected in parallel to the LDs, and a control unit that controls the constant current source and performs on-off control of the switching element. The control unit compares a first current command value and a second current command value for controlling current output from the constant current source, and when the second current command value input after the first current command value is smaller than the first current command value, applies to the LDs a voltage in the range of a voltage at which current flows through the LDs to a voltage less than the lasing threshold of the LDs when there is no output from the LDs.Type: GrantFiled: April 17, 2017Date of Patent: December 31, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Shingo Tsuda, Takeshi Morimoto, Taichiro Tamida, Teruaki Fukuoka, Hiroshi Ikarashi, Akihiko Iwata
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Patent number: 10522978Abstract: In an ignition plug, since a ground electrode is formed in a thin-rod-shape or a mesh-like shape, sufficiently strong radicals are locally generated by a barrier discharge, an anti-inflammation effect by the electrode is small, and the growth of a flame is hardly hindered. Furthermore, by making the thickness dimension of a second dielectric facing a discharge region uniform, the barrier discharge is spread over the surface of the second dielectric, the generation of the radicals is maintained, and combustibility after ignition is promoted. Furthermore, because an end portion of a high voltage electrode and a ground electrode are disposed to face each other within a combustion chamber, a fuel gas introduced into the combustion chamber is liable to flow into the discharge region, and is easily ignited by the radicals generated due to the discharge.Type: GrantFiled: October 7, 2016Date of Patent: December 31, 2019Assignees: Mitsubishi Electric Corporation, NGK SPARK PLUG CO., LTD.Inventors: Taichiro Tamida, Takahiro Inoue, Takashi Hashimoto, Akira Nakagawa, Tomokazu Sakashita, Takayoshi Nagai, Kimihiko Tanaya, Hiroyuki Kameda, Yuichi Yamada, Kenji Ban
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Publication number: 20190356109Abstract: A laser diode-driving power supply includes a constant current source that supplies current to LDs, a switching element connected in parallel to the LDs, and a control unit that controls the constant current source and performs on-off control of the switching element. The control unit compares a first current command value and a second current command value for controlling current output from the constant current source, and when the second current command value input after the first current command value is smaller than the first current command value, applies to the LDs a voltage in the range of a voltage at which current flows through the LDs to a voltage less than the lasing threshold of the LDs when there is no output from the LDs.Type: ApplicationFiled: April 17, 2017Publication date: November 21, 2019Applicant: Mitsubishi Electric CorporationInventors: Shingo TSUDA, Takeshi MORIMOTO, Taichiro TAMIDA, Teruaki FUKUOKA, Hiroshi IKARASHI, Akihiko IWATA
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Patent number: 10436127Abstract: A change amount per unit time of an engine output command for controlling engine output of an internal combustion engine is calculated as an engine output increasing rate, and a power supply device is controlled so that power corresponding to the calculated engine output increasing rate is supplied to a combustion promoter generation device. The combustion promoter generation device generates a combustion promoter through the power supplied from the power supply device to supply the combustion promoter to a combustion chamber of the internal combustion engine, and a generation amount of the combustion promoter increases as the supplied power increases. In this manner, the generation amount of the combustion promoter is adjusted.Type: GrantFiled: December 3, 2015Date of Patent: October 8, 2019Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Takahiro Inoue, Taichiro Tamida, Takashi Hashimoto, Noboru Wada, Akira Nakagawa, Tomokazu Sakashita, Tetsuya Honda
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Patent number: 10416224Abstract: An insulation detector for highly accurately detecting or measuring, with a simple configuration, insulation resistance of a load or an apparatus to a ground or a housing and connected to an electric apparatus including one or both of an intra-apparatus capacitor and a battery, the insulation detector including an intra-insulation detector capacitor, a voltage detecting unit that detects a voltage of the intra-insulation detector capacitor, and a current-path forming switch for connecting the ground or the housing, the intra-apparatus capacitor, and the intra-insulation detector capacitor in series and forming a current path including insulation resistance of the electric apparatus. The insulation detector measures the insulation resistance by measuring a time constant of a change in the voltage of the intra-insulation detector capacitor.Type: GrantFiled: October 28, 2014Date of Patent: September 17, 2019Assignee: Mitsubishi Electric CorporationInventors: Taichiro Tamida, Masayuki Uematsu, Akira Tanabe, Yoshitomo Hayashi, Yoji Tsutsumishita, Kosuke Tsujikawa
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Publication number: 20190227020Abstract: Provided is an electrostatic capacitance detection device including: an electrode pair including a pair of electrodes, the electrode pair being arranged inside a compressor configured to compress refrigerant; a capacitor being connected in series to the electrode pair; an inverter having one of power lines connected to one end of series-connected electrode pair and capacitor, and is configured to drive the compressor, the power lines being used for driving the compressor; and a voltage detecting unit configured to measure a voltage between the pair of electrodes of the electrode pair.Type: ApplicationFiled: June 8, 2017Publication date: July 25, 2019Applicant: Mitsubishi Electric CorporationInventors: Taichiro TAMIDA, Takahiro INOUE, Takashi HASHIMOTO, AKIHIKO IWATA, Shuhei KOYAMA, Takahiko KOBAYASHI
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Patent number: 10361536Abstract: A power supply apparatus includes a power supply for supplying power to a laser oscillator. A reactor has one end serially connected to the laser oscillator and another end serially connected to the power supply, and a parallel diode configures a closed circuit for serial connection of the laser oscillator and the reactor. A current detector detects a current flowing in the reactor, and a first switching device is connected in parallel to the laser oscillator and drives the laser oscillator with pulses. An energy consumption circuit prefetches a current command value based on a control signal from a controller upon driving the laser oscillator with pulses, and when the current command value is smaller than a current command value of a previous pulse, the energy consumption circuit consumes energy until the current command value reaches a predetermined target current value.Type: GrantFiled: February 18, 2016Date of Patent: July 23, 2019Assignee: Mitsubishi Electric CorporationInventors: Shingo Tsuda, Taichiro Tamida, Takashi Hashimoto, Takeshi Morimoto
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Publication number: 20190221354Abstract: An air core type reactor unit, includes a first insulating plate which is provided with a first insulating spacer on one side, a first ferromagnetic member metal plate fixed to an insulating plate, two or more air core coils each having an air core part and formed of coil layers with the separation of an air gap, a second insulating plate, which is provided with a second insulating spacer on another side thereof and has a width smaller than an inside diameter of the coil, to incorporate more air into, a second ferromagnetic member metal plate fixed to an insulating plate, and an insulating stick passing through the air core part of the air core coils, wherein the air core coils are arranged in parallel, and held and fixed between the first insulating plate and the second insulating plate through the first insulating spacer and the second insulating spacer.Type: ApplicationFiled: August 9, 2016Publication date: July 18, 2019Applicant: Mitsubishi Electric CorporationInventors: Toshihiro YOSHIDA, Hajime Nakatani, Daisuke Takauchi, Takashi Kumagai, Kenji Shimohata, Taichiro Tamida