Patents by Inventor Shinichiro Ura
Shinichiro Ura 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: 20220399828Abstract: A direct-current power supply includes: a rectifier circuit in which switching elements are bridge-connected; a reactor; a gate circuitry that drives the switching elements; and a gate circuitry that drives the switching elements. A connection point between the switching element and the switching element is connected to an alternating-current power supply via the reactor, and a connection point between the switching element and the switching element is connected to the alternating-current power supply without via the reactor. A time during which the gate circuitry turns on the switching elements is longer than a time during which the gate circuitry turns on the switching elements.Type: ApplicationFiled: February 20, 2020Publication date: December 15, 2022Inventors: Koyo SHIMIZU, Shinichiro URA, Takuto YAMASHITA, Keisuke UEMURA
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Patent number: 11374523Abstract: An electric motor drive device includes: a main substrate mounted with a power supply circuit that generates, on the basis of alternating-current power supplied from an alternating-current power supply, a drive power to drive a compressor motor; a plurality of connection switching relays that perform switching between connections for the compressor motor; a small substrate mounted with the connection switching relays; a relay drive circuit that switches the connection switching relays; lead wires that connect the compressor motor and the small substrate to the power supply circuit; and lead wires that connect the small substrate and the compressor motor.Type: GrantFiled: September 7, 2018Date of Patent: June 28, 2022Assignee: Mitsubishi Electric CorporationInventors: Shun Miyamori, Shinichiro Ura
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Patent number: 11177756Abstract: An electric motor drive device includes a wire-connected-state switching unit to switch a wire connected state of stator windings of an electric motor to either a delta connected state or a star connected state, an inverter to drive the electric motor, and a relay-voltage detection circuit to detect a relay voltage (VR) that is a power-supply voltage of the wire-connected-state switching unit, and to deactivate the inverter when the relay voltage (VR) is decreased below a threshold.Type: GrantFiled: March 8, 2018Date of Patent: November 16, 2021Assignee: Mitsubishi Electric CorporationInventors: Shun Miyamori, Shinichiro Ura, Keiichiro Shizu
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Publication number: 20210234489Abstract: An electric motor drive device includes: a main substrate mounted with a power supply circuit that generates, on the basis of alternating-current power supplied from an alternating-current power supply, a drive power to drive a compressor motor; a plurality of connection switching relays that perform switching between connections for the compressor motor; a small substrate mounted with the connection switching relays; a relay drive circuit that switches the connection switching relays; lead wires that connect the compressor motor and the small substrate to the power supply circuit; and lead wires that connect the small substrate and the compressor motor.Type: ApplicationFiled: September 7, 2018Publication date: July 29, 2021Inventors: Shun MIYAMORI, Shinichiro URA
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Publication number: 20210226569Abstract: An electric motor drive device includes a wire-connected-state switching unit to switch a wire connected state of stator windings of an electric motor to either a delta connected state or a star connected state, an inverter to drive the electric motor, and a relay-voltage detection circuit to detect a relay voltage (VR) that is a power-supply voltage of the wire-connected-state switching unit, and to deactivate the inverter when the relay voltage (VR) is decreased below a threshold.Type: ApplicationFiled: March 8, 2018Publication date: July 22, 2021Inventors: Shun MIYAMORI, Shinichiro URA, Keiichiro SHIZU
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Patent number: 9960702Abstract: A switch device in a power conversion device is located between a power supply and a load, wherein the power conversion device includes a shunt resistance and a switching element and is capable of executing stable control, the switch device includes a switching element that includes a gate terminal, a gate drive circuit that applies a drive voltage Vcc to a gate terminal of the switching element, and a control unit that generates a drive signal to the gate drive circuit, wherein a value obtained by subtracting a threshold voltage Vth of the switching element from the drive voltage Vcc to be applied to the gate terminal of the switching element is greater than a product of a resistance value Rsh+Rdc from an emitter of the switching element to a negative electrode of the gate drive circuit and a maximum current value Ipeak that flows through the switching element.Type: GrantFiled: September 25, 2013Date of Patent: May 1, 2018Assignee: Mitsubishi Electric CorporationInventors: Keisuke Uemura, Takuya Shimomugi, Koichi Arisawa, Yosuke Shinomoto, Shigeo Umehara, Shinichiro Ura, Makoto Tanikawa
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Patent number: 9780717Abstract: A power conversion device includes an inverter configured by arms including phase upper-arm switching elements and phase lower-arm switching elements, a power-supply shunt resistor, lower-arm shunt resistors, and a control unit that generates drive signals corresponding to the phase upper-arm switching elements and the phase lower-arm switching elements from detection values of the voltage detectors. The power conversion device changes a ratio of time in which all of the upper-arm switching elements are in an ON state and time in which all of the lower-arm switching elements are in the ON state in one cycle of switching of the inverter according to a modulation ratio.Type: GrantFiled: December 3, 2013Date of Patent: October 3, 2017Assignee: Mitsubishi Electric CorporationInventors: Keisuke Uemura, Takuya Shimomugi, Koichi Arisawa, Yosuke Shinomoto, Shigeo Umehara, Shinichiro Ura, Makoto Tanikawa
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Patent number: 9647604Abstract: The power conversion device includes a power-supply shunt resistance provided between an inverter and the negative-voltage side of a DC power supply, respective-phase lower-arm shunt resistances provided between the power-supply shunt resistance and respective-phase lower-arm switching elements, a first overcurrent detection unit performing overcurrent detection on a current that flows through the power-supply shunt resistance on the basis of a power-supply shunt-resistance voltage, and a second overcurrent detection unit performing overcurrent detection on each current that flows through the respective-phase lower-arm shunt resistances on the basis of respective-phase lower-arm voltages, wherein overcurrent detection is performed on each phase current using either one of the overcurrent detection result of the first overcurrent detection unit and the overcurrent detection result of the second overcurrent detection unit.Type: GrantFiled: April 8, 2013Date of Patent: May 9, 2017Assignee: Mitsubishi Electric CorporationInventors: Koichi Arisawa, Keisuke Uemura, Takuya Shimomugi, Yosuke Shinomoto, Shigeo Umehara, Shinichiro Ura, Makoto Tanikawa
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Patent number: 9641121Abstract: A power conversion device includes a power-supply shunt resistance that is provided between an inverter and the negative-voltage side of a DC power supply, and respective-phase lower-arm shunt resistances that are provided between the power-supply shunt resistance and respective-phase lower-arm switching elements. Respective-phase lower-arm voltages, that are respective voltages between the negative-voltage side of the DC power supply and connection points between the respective-phase lower-arm switching elements and the respective-phase lower-arm shunt resistances, are detected to calculate respective-phase currents that flow through a load device in accordance with detection values of the respective-phase lower-arm voltages, and to control a carrier frequency of a carrier signal, which serves as a reference frequency of each drive signal, according to a change in a specific control parameter A.Type: GrantFiled: April 12, 2013Date of Patent: May 2, 2017Assignee: Mitsubishi Electric CorporationInventors: Takuya Shimomugi, Keisuke Uemura, Koichi Arisawa, Yosuke Shinomoto, Shigeo Umehara, Shinichiro Ura, Makoto Tanikawa
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Patent number: 9531301Abstract: The power conversion device includes a power-supply shunt resistor provided between a negative voltage side of a DC power supply and an inverter and phase lower-arm shunt resistors respectively provided between phase lower-arm switching elements of two arms among three arms and the power-supply shunt resistor. The power conversion device detects voltages between connection points of the phase lower-arm switching elements and the phase lower-arm shunt resistors and a negative voltage side of the DC power supply and calculates, on the basis of detection values of the voltages, phase currents flowing to a load device.Type: GrantFiled: April 12, 2013Date of Patent: December 27, 2016Assignee: Mitsubishi Electric CorporationInventors: Keisuke Uemura, Takuya Shimomugi, Koichi Arisawa, Yosuke Shinomoto, Shigeo Umehara, Shinichiro Ura, Makoto Tanikawa
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Publication number: 20160241181Abstract: A power conversion device includes an inverter configured by arms including phase upper-arm switching elements and phase lower-arm switching elements, a power-supply shunt resistor, lower-arm shunt resistors, and a control unit that generates drive signals corresponding to the phase upper-arm switching elements and the phase lower-arm switching elements from detection values of the voltage detectors. The power conversion device changes a ratio of time in which all of the upper-arm switching elements are in an ON state and time in which all of the lower-arm switching elements are in the ON state in one cycle of switching of the inverter according to a modulation ratio.Type: ApplicationFiled: December 3, 2013Publication date: August 18, 2016Inventors: Keisuke UEMURA, Takuya SHIMOMUGI, Koichi ARISAWA, Yosuke SHINOMOTO, Shigeo UMEHARA, Shinichiro URA, Makoto TANIKAWA
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Publication number: 20160233783Abstract: A switch device in a power conversion device is located between a power supply and a load, wherein the power conversion device includes a shunt resistance and a switching element and is capable of executing stable control, the switch device includes a switching element that includes a gate terminal, a gate drive circuit that applies a drive voltage Vcc to a gate terminal of the switching element, and a control unit that generates a drive signal to the gate drive circuit, wherein a value obtained by subtracting a threshold voltage Vth of the switching element from the drive voltage Vcc to be applied to the gate terminal of the switching element is greater than a product of a resistance value Rsh+Rdc from an emitter of the switching element to a negative electrode of the gate drive circuit and a maximum current value Ipeak that flows through the switching element.Type: ApplicationFiled: September 25, 2013Publication date: August 11, 2016Inventors: Keisuke UEMURA, Takuya SHIMOMUGI, Koichi ARISAWA, Yosuke SHINOMOTO, Shigeo UMEHARA, Shinichiro URA, Makoto TANIKAWA
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Publication number: 20160094177Abstract: A power conversion device includes a power-supply shunt resistance that is provided between an inverter and the negative-voltage side of a DC power supply, and respective-phase lower-arm shunt resistances that are provided between the power-supply shunt resistance and respective-phase lower-arm switching elements. Respective-phase lower-arm voltages, that are respective voltages between the negative-voltage side of the DC power supply and connection points between the respective-phase lower-arm switching elements and the respective-phase lower-arm shunt resistances, are detected to calculate respective-phase currents that flow through a load device in accordance with detection values of the respective-phase lower-arm voltages, and to control a carrier frequency of a carrier signal, which serves as a reference frequency of each drive signal, according to a change in a specific control parameter A.Type: ApplicationFiled: April 12, 2013Publication date: March 31, 2016Inventors: Takuya SHIMOMUGI, Keisuke UEMURA, Koichi ARISAWA, Yosuke SHINOMOTO, Shigeo UMEHARA, Shinichiro URA, Makoto TANIKAWA
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Publication number: 20160049896Abstract: The power conversion device includes a power-supply shunt resistance provided between an inverter and the negative-voltage side of a DC power supply, respective-phase lower-arm shunt resistances provided between the power-supply shunt resistance and respective-phase lower-arm switching elements, a first overcurrent detection unit performing overcurrent detection on a current that flows through the power-supply shunt resistance on the basis of a power-supply shunt-resistance voltage, and a second overcurrent detection unit performing overcurrent detection on each current that flows through the respective-phase lower-arm shunt resistances on the basis of respective-phase lower-arm voltages, wherein overcurrent detection is performed on each phase current using either one of the overcurrent detection result of the first overcurrent detection unit and the overcurrent detection result of the second overcurrent detection unit.Type: ApplicationFiled: April 8, 2013Publication date: February 18, 2016Inventors: Koichi ARISAWA, Keisuke UEMURA, Takuya SHIMOMUGI, Yosuke SHINOMOTO, Shigeo UMEHARA, Shinichiro URA, Makoto TANIKAWA
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Publication number: 20160036350Abstract: The power conversion device includes a power-supply shunt resistor provided between a negative voltage side of a DC power supply and an inverter and phase lower-arm shunt resistors respectively provided between phase lower-arm switching elements of two arms among three arms and the power-supply shunt resistor. The power conversion device detects voltages between connection points of the phase lower-arm switching elements and the phase lower-arm shunt resistors and a negative voltage side of the DC power supply and calculates, on the basis of detection values of the voltages, phase currents flowing to a load device.Type: ApplicationFiled: April 12, 2013Publication date: February 4, 2016Applicant: Mitsubishi Electric CorporationInventors: Keisuke UEMURA, Takuya SHIMOMUGI, Koichi ARISAWA, Yosuke SHINOMOTO, Shigeo UMEHARA, Shinichiro URA, Makoto TANIKAWA
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Patent number: 9231468Abstract: An interleaved converter configured by connecting a plurality of switching converter circuits in parallel includes an inter-inductor switch that selects whether inductors are connected in series, an input side switch that is connected to a connection point of the inductor and the inter-inductor switch and selects whether electric power is supplied from a rectifier circuit to the inductor side, an output side switch that is connected to a connection point of the inductor and the inter-inductor switch and selects whether electric power is supplied from the inductor to the diode side, and a control circuit that controls the inter-inductor switch, the input side switch, and the output side switch.Type: GrantFiled: July 13, 2012Date of Patent: January 5, 2016Assignee: Mitsubishi Electric CorporationInventor: Shinichiro Ura
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Publication number: 20140347900Abstract: An interleaved converter configured by connecting a plurality of switching converter circuits in parallel includes an inter-inductor switch that selects whether inductors are connected in series, an input side switch that is connected to a connection point of the inductor and the inter-inductor switch and selects whether electric power is supplied from a rectifier circuit to the inductor side, an output side switch that is connected to a connection point of the inductor and the inter-inductor switch and selects whether electric power is supplied from the inductor to the diode side, and a control circuit that controls the inter-inductor switch, the input side switch, and the output side switch.Type: ApplicationFiled: July 13, 2012Publication date: November 27, 2014Applicant: Mitsubishi Electric CorporationInventor: Shinichiro Ura