Patents by Inventor Hidetoshi YAMAKAWA
Hidetoshi YAMAKAWA 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: 11973452Abstract: A fan motor stopping apparatus includes a conversion circuit that converts alternating-current voltage supplied from an alternating-current power supply into direct-current voltage, a smoothing capacitor that is connected to a fan motor included in an air conditioner and smooths the direct-current voltage from the conversion circuit, a voltage detection circuit that detects a voltage across the smoothing capacitor, and a fan motor shutdown circuit that suspends the fan motor in operation when the voltage detection circuit detects a voltage less than or equal to a threshold that is preset for suspending the operation of the fan motor.Type: GrantFiled: October 10, 2019Date of Patent: April 30, 2024Assignee: Mitsubishi Electric CorporationInventor: Hidetoshi Yamakawa
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Patent number: 11677310Abstract: A power converting apparatus includes a diode bridge that converts first AC power supplied from a power supply into DC power, a main circuit capacitor that smooths the DC power, one or more capacitors that reduces a noise component included in the first AC power, and a path switch. The path switch switches a charging path for the main circuit capacitor so that current output from the AC power supply flows into the main circuit capacitor via the capacitor(s) from when supply of the first AC power starts until a voltage of the main circuit capacitor reaches a predetermined voltage, and that the current output from the AC power supply flows into the main circuit capacitor without bypassing the capacitor(s) after the voltage of the main circuit capacitor reaches the predetermined voltage.Type: GrantFiled: September 12, 2018Date of Patent: June 13, 2023Assignee: Mitsubishi Electric CorporationInventor: Hidetoshi Yamakawa
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Patent number: 11506412Abstract: An air conditioning apparatus including an outdoor unit and an indoor unit comprises a converter main circuit that rectifies and smooths an AC power supply, and allows a DC voltage to be generated across a main circuit capacitor, an inverter main circuit that converts the DC voltage generated by the main circuit capacitor into an AC voltage, a compressor motor driven by the inverter main circuit, an outdoor fan, a fan motor that rotationally drives the outdoor fan, and a microcomputer that controls the outdoor unit. When the fan motor rotates due to outside wind hitting the outdoor fan and enters a power generating state during a standby power saving mode of the outdoor unit, the microcomputer prevents the outdoor unit from shifting to a non-operating state from the standby power saving mode.Type: GrantFiled: January 11, 2018Date of Patent: November 22, 2022Assignee: Mitsubishi Electric CorporationInventor: Hidetoshi Yamakawa
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Publication number: 20220239239Abstract: A fan motor stopping apparatus includes a conversion circuit that converts alternating-current voltage supplied from an alternating-current power supply into direct-current voltage, a smoothing capacitor that is connected to a fan motor included in an air conditioner and smooths the direct-current voltage from the conversion circuit, a voltage detection circuit that detects a voltage across the smoothing capacitor, and a fan motor shutdown circuit that suspends the fan motor in operation when the voltage detection circuit detects a voltage less than or equal to a threshold that is preset for suspending the operation of the fan motor.Type: ApplicationFiled: October 10, 2019Publication date: July 28, 2022Inventor: Hidetoshi YAMAKAWA
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Publication number: 20210143727Abstract: A power converting apparatus includes a diode bridge that converts first AC power supplied from a power supply into DC power, a main circuit capacitor (capacitors) that smooths the DC power, an inverter that converts the smoothed DC power into second AC power and supplies the second AC power to a load, a capacitor that reduces a noise component included in the first AC power, and a path switching unit (relays), and a control unit that switches a charging path for the main circuit capacitor so that current output from the power supply flows into the main circuit capacitor via the capacitors from when supply of the first AC power starts until a voltage of the main circuit capacitor reaches a predetermined voltage, and that the current output from the power supply flows into the main circuit capacitor without passing through the capacitors after the voltage of the main circuit capacitor reaches the predetermined voltage.Type: ApplicationFiled: September 12, 2018Publication date: May 13, 2021Inventor: Hidetoshi YAMAKAWA
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Publication number: 20200408430Abstract: An air conditioning apparatus including an outdoor unit and an indoor unit comprises a converter main circuit that rectifies and smooths an AC power supply, and allows a DC voltage to be generated across a main circuit capacitor, an inverter main circuit that converts the DC voltage generated by the main circuit capacitor into an AC voltage, a compressor motor driven by the inverter main circuit, an outdoor fan, a fan motor that rotationally drives the outdoor fan, and a microcomputer that controls the outdoor unit. When the fan motor rotates due to outside wind hitting the outdoor fan and enters a power generating state during a standby power saving mode of the outdoor unit, the microcomputer prevents the outdoor unit from shifting to a non-operating state from the standby power saving mode.Type: ApplicationFiled: January 11, 2018Publication date: December 31, 2020Inventor: Hidetoshi YAMAKAWA
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Patent number: 10063133Abstract: A power supply device includes a first rectifying unit that converts the AC power passed through an input unit into DC power, a power-factor improving unit that improves a power factor of the DC power output from the first rectifying unit, a first power storage unit that stores the DC power passed through the power-factor improving unit and supplies the stored DC power to a load side, a second rectifying unit connected to a portion where the input unit is connected to the AC power supply, the second rectifying unit converting the AC power into the DC power, a second power storage unit that stores the DC power passed through the second rectifying unit, and a control unit that operates using the electric power stored in the second power storage unit and, when a short-circuit failure occurs in the power-factor improving unit, performs control for interrupting the input unit.Type: GrantFiled: March 31, 2015Date of Patent: August 28, 2018Assignee: Mitsubishi Electric CorporationInventors: Keiichiro Shizu, Hidetoshi Yamakawa
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Publication number: 20180034361Abstract: A power supply device includes a first rectifying unit that converts the AC power passed through an input unit into DC power, a power-factor improving unit that improves a power factor of the DC power output from the first rectifying unit, a first power storage unit that stores the DC power passed through the power-factor improving unit and supplies the stored DC power to a load side, a second rectifying unit connected to a portion where the input unit is connected to the AC power supply, the second rectifying unit converting the AC power into the DC power, a second power storage unit that stores the DC power passed through the second rectifying unit, and a control unit that operates using the electric power stored in the second power storage unit and, when a short-circuit failure occurs in the power-factor improving unit, performs control for interrupting the input unit.Type: ApplicationFiled: March 31, 2015Publication date: February 1, 2018Inventors: Keiichiro SHIZU, Hidetoshi YAMAKAWA