Patents by Inventor Tomoisa Taniguchi
Tomoisa Taniguchi 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: 11979097Abstract: A converter circuit converts AC electric power into DC power. An inverter circuit converts the DC power into AC power. A capacitor is connected in parallel to each of the converter circuit and the inverter circuit between these circuits. The capacitor allows variation of an output voltage from the converter circuit, and absorbs variation of an output voltage from the inverter circuit due to a switching operation. An overvoltage protection circuit includes a resistor and a semiconductor element connected in series to each other. The overvoltage protection circuit is connected in parallel to the capacitor to protect the inverter circuit from an overvoltage. First and second control units respectively control the inverter circuit and the overvoltage protection circuit.Type: GrantFiled: July 19, 2021Date of Patent: May 7, 2024Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Ryou Matsuyama, Masaki Kono, Tomoisa Taniguchi
-
Patent number: 11967909Abstract: In a first section of a power conversion device, a second switch is turned off, a first duty drec and a third duty dz are selected so that a direct current voltage Vdc to be input to a current source becomes equal to a direct current voltage command value Vdc*, a first conversion operation of supplying power from the voltage source to the current source is performed, and the capacitor is charged by the rectified voltage via the clamp diode. In a second section of the power conversion device, a first switch is turned off, a second duty dc and the third duty dz are selected so that the direct current voltage Vdc to be input to the current source becomes equal to the direct current voltage command value Vdc*, and a second conversion operation of supplying power from the capacitor to the current source is performed.Type: GrantFiled: March 29, 2022Date of Patent: April 23, 2024Assignee: Daikin Industries, Ltd.Inventors: Kenichi Sakakibara, Tomoisa Taniguchi
-
Patent number: 11611285Abstract: In a power converter, an inductance L of a reactor and a capacitance C of a capacitor satisfy a condition of the expression (1) below. In the power converter, a current-limiting circuit between an AC power source and the capacitor is unnecessary. Herein, ?m ([A·s]) is a value of a ratio of a maximum rated current squared time product to a maximum rated output current of diodes of a rectifier circuit, Pmax is a maximum power consumption of the motor, Vac is a voltage value of a three-phase AC voltage, and a value of a constant a is 4.3 a · C · C L · Vac 3 P max ? ? m .Type: GrantFiled: November 5, 2018Date of Patent: March 21, 2023Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka Doi, Masaki Kouno, Tomoisa Taniguchi
-
Publication number: 20220224248Abstract: In a first section of a power conversion device, a second switch is turned off, a first duty drec and a third duty dz are selected so that a direct current voltage Vdc to be input to a current source becomes equal to a direct current voltage command value Vdc*, a first conversion operation of supplying power from the voltage source to the current source is performed, and the capacitor is charged by the rectified voltage via the clamp diode. In a second section of the power conversion device, a first switch is turned off, a second duty dc and the third duty dz are selected so that the direct current voltage Vdc to be input to the current source becomes equal to the direct current voltage command value Vdc*, and a second conversion operation of supplying power from the capacitor to the current source is performed.Type: ApplicationFiled: March 29, 2022Publication date: July 14, 2022Inventors: Kenichi SAKAKIBARA, Tomoisa TANIGUCHI
-
Publication number: 20210376748Abstract: In a power converter, an inductance L of a reactor and a capacitance C of a capacitor satisfy a condition of the expression (1) below. In the power converter, a current-limiting circuit between an AC power source and the capacitor is unnecessary. Herein, ?m ([A·s]) is a value of a ratio of a maximum rated current squared time product to a maximum rated output current of diodes of a rectifier circuit, Pmax is a maximum power consumption of the motor, Vac is a voltage value of a three-phase AC voltage, and a value of a constant a is 4.3 a . C . C L · Vac 3 P max ? ? m .Type: ApplicationFiled: November 5, 2018Publication date: December 2, 2021Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka DOI, Masaki KOUNO, Tomoisa TANIGUCHI
-
Publication number: 20210344281Abstract: A converter circuit converts AC electric power into DC power. An inverter circuit converts the DC power into AC power. A capacitor is connected in parallel to each of the converter circuit and the inverter circuit between these circuits. The capacitor allows variation of an output voltage from the converter circuit, and absorbs variation of an output voltage from the inverter circuit due to a switching operation. An overvoltage protection circuit includes a resistor and a semiconductor element connected in series to each other. The overvoltage protection circuit is connected in parallel to the capacitor to protect the inverter circuit from an overvoltage. First and second control units respectively control the inverter circuit and the overvoltage protection circuit.Type: ApplicationFiled: July 19, 2021Publication date: November 4, 2021Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Ryou MATSUYAMA, Masaki KONO, Tomoisa TANIGUCHI
-
Patent number: 10811997Abstract: A power converter includes a plurality of switching elements, a converter circuit that rectifies an AC voltage of an AC power source, a DC link that receives output of the converter circuit and generates a DC voltage, an inverter circuit that converts the DC voltage into an AC voltage of a predetermined frequency through a switching operation, and a control unit that controls the switching operation. A capacitance value of a capacitor is set so that a maximum value of the DC voltage becomes twice or more of a minimum value. The control unit controls the switching elements such that two or more extrema appear in a power source half cycle in a waveform synthesized from second, fourth, and sixth harmonics that have a power source frequency as a fundamental frequency and are extracted from a waveform of an absolute value of a motor current vector.Type: GrantFiled: September 27, 2018Date of Patent: October 20, 2020Assignee: Daikin Industries, Ltd.Inventors: Nobuo Hayashi, Takurou Ogawa, Morimitsu Sekimoto, Tomoisa Taniguchi
-
Publication number: 20200220481Abstract: A power converter includes a plurality of switching elements, a converter circuit that rectifies an AC voltage of an AC power source, a DC link that receives output of the converter circuit and generates a DC voltage, an inverter circuit that converts the DC voltage into an AC voltage of a predetermined frequency through a switching operation, and a control unit that controls the switching operation. A capacitance value of a capacitor is set so that a maximum value of the DC voltage becomes twice or more of a minimum value. The control unit controls the switching elements such that two or more extrema appear in a power source half cycle in a waveform synthesized from second, fourth, and sixth harmonics that have a power source frequency as a fundamental frequency and are extracted from a waveform of an absolute value of a motor current vector.Type: ApplicationFiled: September 27, 2018Publication date: July 9, 2020Inventors: Nobuo HAYASHI, Takurou OGAWA, Morimitsu SEKIMOTO, Tomoisa TANIGUCHI
-
Patent number: 10439542Abstract: An electric power conversion device includes: a converter circuit which includes a boost chopper; a capacitor which is connected between output terminals of the converter circuit; a boost chopper which boosts a terminal voltage of the capacitor; a multiphase inverter circuit; and a boost chopper controller. In a case where the operation of the boost chopper is continuously stopped, the capacitor has a capacitance allowing the terminal voltage of the capacitor to have a pulse frequency twice as high as that of the AC power source. The multiphase inverter circuit has an output power which is allowed to fluctuate in synchronization with a power source.Type: GrantFiled: September 30, 2015Date of Patent: October 8, 2019Assignee: Daikin Industries, Ltd.Inventors: Tomoisa Taniguchi, Morimitsu Sekimoto, Yasutaka Taguchi
-
Patent number: 9853559Abstract: Disclosed herein is a power conversion device including a storage and a power conversion controller. The storage stores multiple values, each correlated to a disturbance that causes distortion in a current to a power converter, in association with a phase angle of a voltage of an AC power supply. The power conversion controller controls ON/OFF operations by using the values stored in the storage to compensate for a manipulated variable of control performed by the power converter in association with the phase angle of the voltage of the AC power supply.Type: GrantFiled: March 27, 2015Date of Patent: December 26, 2017Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Tomoisa Taniguchi, Morimitsu Sekimoto, Takurou Ogawa, Eiji Tooyama, Nobuo Hayashi
-
Publication number: 20170279398Abstract: An electric power conversion device includes: a converter circuit which includes a boost chopper; a capacitor which is connected between output terminals of the converter circuit; a boost chopper which boosts a terminal voltage of the capacitor; a multiphase inverter circuit; and a boost chopper controller. In a case where the operation of the boost chopper is continuously stopped, the capacitor has a capacitance allowing the terminal voltage of the capacitor to have a pulse frequency twice as high as that of the AC power source. The multiphase inverter circuit has an output power which is allowed to fluctuate in synchronization with a power source.Type: ApplicationFiled: September 30, 2015Publication date: September 28, 2017Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Tomoisa TANIGUCHI, Morimitsu SEKIMOTO, Yasutaka TAGUCHI
-
Publication number: 20170077829Abstract: Disclosed herein is a power conversion device including a storage and a power conversion controller. The storage stores multiple values, each correlated to a disturbance that causes distortion in a current to a power converter, in association with a phase angle of a voltage of an AC power supply. The power conversion controller controls ON/OFF operations by using the values stored in the storage to compensate for a manipulated variable of control performed by the power converter in association with the phase angle of the voltage of the AC power supply.Type: ApplicationFiled: March 27, 2015Publication date: March 16, 2017Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Tomoisa TANIGUCHI, Morimitsu SEKIMOTO, Takurou OGAWA, Eiji TOOYAMA, Nobuo HAYASHI
-
Patent number: 9214881Abstract: A DC link is provided, which includes a capacitor connected in parallel to an output of a converter circuit, and outputs a pulsating DC link voltage. An inverter circuit is provided, which converts an output of the DC link to AC by switching, and supplies the AC to a motor connected thereto. A controller is provided, which controls switching of the inverter circuit so that motor currents pulsate in synchronization with pulsation of a power-supply voltage. The controller controls the switching of the inverter circuit in accordance with a load of the motor or an operational state of the motor, and reduces pulsation amplitude of the motor currents.Type: GrantFiled: January 18, 2012Date of Patent: December 15, 2015Assignee: DAIKIN INDUSTRIES, LTD.Inventors: Morimitsu Sekimoto, Tomoisa Taniguchi, Hiroshi Hibino, Toshiyuki Maeda
-
Publication number: 20130300327Abstract: A DC link is provided, which includes a capacitor connected in parallel to an output of a converter circuit, and outputs a pulsating DC link voltage. An inverter circuit is provided, which converts an output of the DC link to AC by switching, and supplies the AC to a motor connected thereto. A controller is provided, which controls switching of the inverter circuit so that motor currents pulsate in synchronization with pulsation of a power-supply voltage. The controller controls the switching of the inverter circuit in accordance with a load of the motor or an operational state of the motor, and reduces pulsation amplitude of the motor currents.Type: ApplicationFiled: January 18, 2012Publication date: November 14, 2013Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Morimitsu Sekimoto, Tomoisa Taniguchi, Hiroshi Hinino, Toshiyuki Maeda
-
Publication number: 20120182770Abstract: The power converter includes a diode rectifier which rectifies alternating current power output from an alternating current power supply, a reactor provided between the alternating current power supply and the diode rectifier, an inverter circuit to which power output from the diode rectifier is directly supplied, and a capacitor provided between power supply lines on a primary side of the diode rectifier.Type: ApplicationFiled: September 28, 2010Publication date: July 19, 2012Inventors: Morimitsu Sekimoto, Hiroshi Hibino, Tomoisa Taniguchi, Toshiyuki Maeda
-
Patent number: 7671557Abstract: Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage vector lengths exceeds a predetermined value, and adjusting the voltage vector by adding a positive or reversed voltage based upon the above determination and an integrated error value.Type: GrantFiled: March 25, 2008Date of Patent: March 2, 2010Assignee: Daikin Industries, Ltd.Inventors: Toshiyuki Maeda, Tomoisa Taniguchi
-
Patent number: 7411369Abstract: Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage vector lengths exceeds a predetermined value, and adjusting the voltage vector by adding a positive or reversed voltage based upon the above determination and an integrated error value.Type: GrantFiled: December 22, 2006Date of Patent: August 12, 2008Assignee: Daikin Industries, Ltd.Inventors: Toshiyuki Maeda, Tomoisa Taniguchi
-
Publication number: 20080180056Abstract: Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage vector lengths exceeds a predetermined value, and adjusting the voltage vector by adding a positive or reversed voltage based upon the above determination and an integrated error value.Type: ApplicationFiled: March 25, 2008Publication date: July 31, 2008Inventors: Toshiyuki Maeda, Tomoisa Taniguchi
-
Publication number: 20070114966Abstract: Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage vector lengths exceeds a predetermined value, and adjusting the voltage vector by adding a positive or reversed voltage based upon the above determination and an integrated error value.Type: ApplicationFiled: December 22, 2006Publication date: May 24, 2007Inventors: Toshiyuki Maeda, Tomoisa Taniguchi
-
Patent number: 7173393Abstract: Apparatus and methods for phase current detection used for driving a motor by supplying outputs from a pulse width modulation (PWM) converter to the motor. One method presented provides detecting a DC link current and a vector pattern, determining whether a voltage vector lengths exceeds a predetermined value, and adjusting the voltage vector by adding a positive or reversed voltage based upon the above determination and an integrated error value.Type: GrantFiled: September 27, 2002Date of Patent: February 6, 2007Assignee: Daiken Industries, Ltd.Inventors: Toshiyuki Maeda, Tomoisa Taniguchi