Patents by Inventor Katsutaka Tanabe
Katsutaka Tanabe 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: 10483873Abstract: A power conversion apparatus includes an inverter for drive controlling a plurality of switching elements, drive circuits, a control circuit, a current detection part, an overcurrent detection circuit, and a protection circuit. The protection circuit, which receives a detection signal that the overcurrent detection circuit outputs to indicate detection of overcurrent, outputs a signal to the drive circuits for turning off a switching element that has been turned on by a control signal from the control circuit for a predetermined time.Type: GrantFiled: December 17, 2018Date of Patent: November 19, 2019Assignee: OMRON CorporationInventors: Katsutaka Tanabe, Takao Mizokami, Takuji Kumagai
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Patent number: 10461637Abstract: A switching element with a small current capacity is provided to be able to be used in a DC-DC converter. The DC-DC converter includes a switching circuit in which a first switching element, a second switching element, a third switching element, and a fourth switching element are connected in series, a flying capacitor that is connected between a connection portion between the first switching element and the second switching element and a connection portion between the third switching element and the fourth switching element, a reactor that is connected between a connection portion between the second switching element and the third switching element and a positive electrode of an input unit, and a control circuit that turns on/off the switching element, in which the control circuit turns on/off the switching elements so that a peak value in a reactor current becomes equal to or smaller than a predetermined value.Type: GrantFiled: September 17, 2018Date of Patent: October 29, 2019Assignees: OMRON Corporation, NAGAOKA University of TechnologyInventors: Junichi Itoh, Katsutaka Tanabe, Akihiro Funamoto, Koji Ando
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Publication number: 20190280616Abstract: A power conversion apparatus includes an inverter for drive controlling a plurality of switching elements, drive circuits, a control circuit, a current detection part, an overcurrent detection circuit, and a protection circuit. The protection circuit, which receives a detection signal that the overcurrent detection circuit outputs to indicate detection of overcurrent, outputs a signal to the drive circuits for turning off a switching element that has been turned on by a control signal from the control circuit for a predetermined time.Type: ApplicationFiled: December 17, 2018Publication date: September 12, 2019Applicant: OMRON CorporationInventors: Katsutaka TANABE, Takao MIZOKAMI, Takuji KUMAGAI
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Patent number: 10340845Abstract: A voltage transform part transforms the direct-current power input to an input part. A first input and output part outputs the transformed direct-current power to a battery unit and to which direct-current power is input from the battery unit. A conversion part converts the direct-current power input to the input part into alternating-current power. A second input and output part outputs the alternating-current power to a power system or a load and to which an alternating-current power is input from the power system. The conversion part converts the alternating-current power input to the second input and output part into direct-current power. The second voltage transform part transforms the direct-current power converted by the conversion part and transforms the direct-current power input to the first input and output part. The conversion part converts the direct-current power transformed by the second voltage transform part into alternating-current power.Type: GrantFiled: September 13, 2018Date of Patent: July 2, 2019Assignee: OMRON CorporationInventors: Atsuo Minato, Katsumi Ohashi, Arata Yoneda, Kazumi Tsuchimichi, Katsutaka Tanabe, Junichiro Yamada, Yasuhiro Tsubota
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Publication number: 20190165725Abstract: A voltage transform part transforms the direct-current power input to an input part. A first input and output part outputs the transformed direct-current power to a battery unit and to which direct-current power is input from the battery unit. A conversion part converts the direct-current power input to the input part into alternating-current power. A second input and output part outputs the alternating-current power to a power system or a load and to which an alternating-current power is input from the power system. The conversion part converts the alternating-current power input to the second input and output part into direct-current power. The second voltage transform part transforms the direct-current power converted by the conversion part and transforms the direct-current power input to the first input and output part. The conversion part converts the direct-current power transformed by the second voltage transform part into alternating-current power.Type: ApplicationFiled: September 13, 2018Publication date: May 30, 2019Applicant: OMRON CorporationInventors: Atsuo MINATO, Katsumi OHASHI, Arata YONEDA, Kazumi TSUCHIMICHI, Katsutaka TANABE, Junichiro YAMADA, Yasuhiro TSUBOTA
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Publication number: 20190149044Abstract: A switching element with a small current capacity is provided to be able to be used in a DC-DC converter. The DC-DC converter includes a switching circuit in which a first switching element, a second switching element, a third switching element, and a fourth switching element are connected in series, a flying capacitor that is connected between a connection portion between the first switching element and the second switching element and a connection portion between the third switching element and the fourth switching element, a reactor that is connected between a connection portion between the second switching element and the third switching element and a positive electrode of an input unit, and a control circuit that turns on/off the switching element, in which the control circuit turns on/off the switching elements so that a peak value in a reactor current becomes equal to or smaller than a predetermined value.Type: ApplicationFiled: September 17, 2018Publication date: May 16, 2019Applicants: OMRON Corporation, NAGAOKA University of TechnologyInventors: Junichi ITOH, Katsutaka TANABE, Akihiro FUNAMOTO, Koji ANDO
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Patent number: 8902620Abstract: A power conditioner that suppresses distortion in a waveform of a sinusoidal generated voltage includes a first and second group including two switches each connected in inverse parallel and in series. The power conditioner alternately turns on and off both switches in the first group at a prescribed chopping frequency and alternately turns on and off both switches in the second group at a PWM frequency higher than the chopping frequency. If control is performed with a dead-time provided in the on/off timing for both switches in each group, the power conditioner adjusts and controls the on/off duty for the second group switches to correspond to the effective on drive in one switch by each diode during the dead-time for each switch in the first group.Type: GrantFiled: December 18, 2012Date of Patent: December 2, 2014Assignee: Omron CorporationInventors: Masao Mabuchi, Kazuyoshi Imamura, Yasuhiro Tsubota, Takao Mizokami, Katsutaka Tanabe, Kotaro Nakamura, Teruyuki Maeda, Nobuyuki Toyoura, Mio Yamada
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Patent number: 8570781Abstract: A power conditioner that suppresses generation of voltage spikes in a part of a generated sinusoidal voltage waveform. An offset between the timing of chopping, which depends on whether the voltage difference between the voltage of a third pulse voltage series and a sinusoidal voltage is positive or negative, and the timing of the switching between on/off duty cycles of a seventh and eighth switch is calculated, and the on/off duty cycles of the seventh and eighth switches are controlled on the basis of the timing offset.Type: GrantFiled: December 18, 2012Date of Patent: October 29, 2013Assignee: Omron CorporationInventors: Masao Mabuchi, Kazuyoshi Imamura, Yasuhiro Tsubota, Takao Mizokami, Katsutaka Tanabe, Teruyuki Maeda, Kotaro Nakamura, Nobuyuki Toyoura, Mio Yamada
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Patent number: 7235891Abstract: An apparatus for controlling the operation of power conditioners (10) for supplying the generated power to an external power system such as a commercial power system, in which power conditioners (10) are interconnected to an external power system, the power conditioners (10) are interconnected through information exchange means, at least one of the power conditioners (10) monitors the reverse power flow, and the power conditioners (10) exchange the monitor information with information of the other power conditioners (10), thereby equalizing the outputs of all the power conditioners (10). A generator (42) has armature windings (60), and an inverter circuit (13) of the power conditioner (10) provided for each of the armature windings (60) is controlled by cable or radio.Type: GrantFiled: August 15, 2003Date of Patent: June 26, 2007Inventors: Masayoshi Tokiwa, Shinji Hibi, Kotaro Nakamura, Masao Mabuchi, Nobuyuki Toyoura, Kenichi Inoue, Katsutaka Tanabe, Yasuyuki Okoba
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Patent number: 6807072Abstract: An electric power conversion device comprises switching elements 2a, 2b making up a push-pull converter, a pulse transformer T, a rectification diode D1, a rectification diode D2, a choke coil L, a smoothing capacitor C, a DC magnetic deviation prevention means 3, and an inverter 4. The DC magnetic deviation prevention means 3 detects the coil currents I1, I2 flowing in the primary windings M1, M2 of the pulse transformer T. By controlling (shortening) the on time of the switching element having a greater amount of current, the coil currents I1, I2 are balanced (I1=I2), thereby preventing the magnetic deviation phenomena of the pulse transformer T.Type: GrantFiled: June 3, 2003Date of Patent: October 19, 2004Assignee: Omron CorporationInventors: Katsutaka Tanabe, Nobuyuki Toyoura, Seiji Oka, Masao Mabuchi, Kotaro Nakamura, Yuji Tsurukawa, Kenichi Inoue
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Publication number: 20040032127Abstract: An apparatus for controlling the operation of power conditioners (10) for supplying the generated power to an external power system such as a commercial power system, in which power conditioners (10) are interconnected to an external power system, the power conditioners (10) are interconnected through information exchange means, at least one of the power conditioners (10) monitors the reverse power flow, and the power conditioners (10) exchange the monitor information with information of the other power conditioners (10), thereby equalizing the outputs of all the power conditioners (10). A generator (42) has armature windings (60), and an inverter circuit (13) of the power conditioner (10) provided for each of the armature windings (60) is controlled by cable or radio.Type: ApplicationFiled: August 15, 2003Publication date: February 19, 2004Inventors: Masayoshi Tokiwa, Shinji Hibi, Kotaro Nakamura, Masao Mabuchi, Nobuyuki Toyoura, Kenichi Inoue, Katsutaka Tanabe, Yasuyuki Okoba
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Publication number: 20040027842Abstract: An electric power conversion device comprises switching elements 2a, 2b making up a push-pull converter, a pulse transformer T, a rectification diode D1, a rectification diode D2, a choke coil L, a smoothing capacitor C, a DC magnetic deviation prevention means 3, and an inverter 4. The DC magnetic deviation prevention means 3 detects the coil currents I1, I2 flowing in the primary windings M1, M2 of the pulse transformer T. By controlling (shortening) the on time of the switching element having a greater amount of current, the coil currents I1, I2 are balanced (I1=I2), thereby preventing the magnetic deviation phenomena of the pulse transformer T.Type: ApplicationFiled: June 3, 2003Publication date: February 12, 2004Applicant: OMRON CORPORATIONInventors: Katsutaka Tanabe, Nobuyuki Toyoura, Seiji Oka, Masao Mabuchi, Kotaro Nakamura, Yuji Tsurukawa, Kenichi Inoue