Patents by Inventor Mai UENAKA
Mai UENAKA 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: 10404170Abstract: A power supply unit includes: a first rectifying device connected to the direct current power source, a second rectifying device having an anode connected to the first rectifying device, a first condenser having one end connected to the second rectifying device, a second condenser connected to the second rectifying device, a third rectifying device having an anode connected to the second rectifying device, a resonance reactor connected to the third rectifying device and connected to the first condenser, s switching device connected to the direct current power source and connected the third rectifying device, an output reactor connected to the third rectifying device, an output condenser connected to the direct current power source and connected to the output reactor, an output rectifying device connected to the first condenser and connected to the direct current power source, a control circuit sending a gate signal to the switching device.Type: GrantFiled: April 2, 2015Date of Patent: September 3, 2019Assignee: Mitsubishi Electric CorporationInventors: Mai Uenaka, Yuuya Tanaka, Masaki Yamada, Yoshihiro Takeshima
-
Patent number: 10389245Abstract: An electric power converter including an electric-power conversion circuit that performs bidirectional conversion of a voltage between a DC power source and a motor and outputs the voltage, a first voltage detector that detects an inter-terminal voltage at the DC power source side of the electric-power conversion unit, a second voltage detector that detects an inter-terminal voltage at the motor side of the electric-power conversion unit, and a controller. The controller includes a first calculator that calculates a main duty, based on a target voltage and the inter-terminal voltage at the motor side, and a second calculator that calculates a sub-duty, based on the main duty, the inter-terminal voltage at the motor side, and the inter-terminal voltage, at the DC power source side, detected by the second voltage detection unit. The controller calculates a duty amount for operating the electric-power conversion unit, based on the main duty and the sub-duty.Type: GrantFiled: September 15, 2016Date of Patent: August 20, 2019Assignee: Mitsubishi Electric CorporationInventors: Mai Uenaka, Matahiko Ikeda, Ryota Kondo
-
Patent number: 10044280Abstract: A DC/DC converter includes: duty command calculation units for calculating duty command values for first, second, third, and fourth switching elements on the basis of difference voltage between a high-voltage-side voltage command value and a high-voltage-side voltage detection value; and a phase shift duty command calculation unit for calculating a phase shift duty command value corresponding to a phase difference between gate signals for the first and fourth switching elements and gate signals for the second and third switching elements, on the basis of difference voltage between a voltage target value and a charge voltage detection value of a charge/discharge capacitor, wherein gate signals for driving the first, second, third, fourth switching elements are generated on the basis of the duty command values and the phase shift duty command value.Type: GrantFiled: January 28, 2016Date of Patent: August 7, 2018Assignee: Mitsubishi Electric CorporationInventors: Ryota Kondo, Mai Uenaka, Matahiko Ikeda
-
Publication number: 20180183318Abstract: A power supply unit includes: a first rectifying device connected to the direct current power source, a second rectifying device having an anode connected to the first rectifying device, a first condenser having one end connected to the second rectifying device, a second condenser connected to the second rectifying device, a third rectifying device having an anode connected to the second rectifying device, a resonance reactor connected to the third rectifying device and connected to the first condenser, s switching device connected to the direct current power source and connected the third rectifying device, an output reactor connected to the third rectifying device, an output condenser connected to the direct current power source and connected to the output reactor, an output rectifying device connected to the first condenser and connected to the direct current power source, a control circuit sending a gate signal to the switching device.Type: ApplicationFiled: April 2, 2015Publication date: June 28, 2018Applicant: Mitsubishi Electric CorporationInventors: Mai UENAKA, Yuuya TANAKA, Masaki YAMADA, Yoshihiro TAKESHIMA
-
Publication number: 20180183333Abstract: An electric power converter including an electric-power conversion circuit that performs bidirectional conversion of a voltage between a DC power source and a motor and outputs the voltage, a first voltage detector that detects an inter-terminal voltage at the DC power source side of the electric-power conversion unit, a second voltage detector that detects an inter-terminal voltage at the motor side of the electric-power conversion unit, and a controller. The controller includes a first calculator that calculates a main duty, based on a target voltage and the inter-terminal voltage at the motor side, and a second calculator that calculates a sub-duty, based on the main duty, the inter-terminal voltage at the motor side, and the inter-terminal voltage, at the DC power source side, detected by the second voltage detection unit. The controller calculates a duty amount for operating the electric-power conversion unit, based on the main duty and the sub-duty.Type: ApplicationFiled: September 15, 2016Publication date: June 28, 2018Applicant: Mitsubishi Electric CorporationInventors: Mai UENAKA, Matahiko IKEDA, Ryota KONDO
-
Patent number: 10003264Abstract: In this DC/DC converter, a first controller calculates a first operation value on the basis of a difference between output voltage Vout and a first calculated value calculated on the basis of a detection value of voltage of the charge/discharge capacitor. A second controller calculates a second operation value on the basis of a difference between a charge/discharge capacitor voltage target value Vcf* and charge/discharge capacitor voltage Vcf. In control blocks, addition and subtraction of the first and second operation values are performed, and the conduction rates for switching elements are controlled, to control the output voltage and a charge/discharge capacitor voltage, thereby preventing application of overvoltage to the switching elements.Type: GrantFiled: December 21, 2015Date of Patent: June 19, 2018Assignee: Mitsubishi Electric CorporationInventors: Mai Uenaka, Yuta Komatsu, Matahiko Ikeda
-
Patent number: 9893620Abstract: An object of this invention is to obtain a control apparatus and a control method for a DC/DC converter, with which a DC/DC converter can be controlled with superior stability and responsiveness while reducing the size of a storage medium. A calculation value is calculated in accordance with a specific control method using a differential voltage between a target output voltage and an output voltage, whereupon a control calculation value is calculated from the calculation value and an input voltage.Type: GrantFiled: September 8, 2016Date of Patent: February 13, 2018Assignee: Mitsubishi Electric CorporationInventors: Matahiko Ikeda, Mai Uenaka, Yuta Komatsu, Ryota Kondo, Masaru Kobayashi, Nobuhiro Kihara, Naoki Moritake
-
Publication number: 20170310219Abstract: In this DC/DC converter, a first controller calculates a first operation value on the basis of a difference between output voltage Vout and a first calculated value calculated on the basis of a detection value of voltage of the charge/discharge capacitor. A second controller calculates a second operation value on the basis of a difference between a charge/discharge capacitor voltage target value Vcf* and charge/discharge capacitor voltage Vcf. In control blocks, addition and subtraction of the first and second operation values are performed, and the conduction rates for switching elements are controlled, to control the output voltage and a charge/discharge capacitor voltage, thereby preventing application of overvoltage to the switching elements.Type: ApplicationFiled: December 21, 2015Publication date: October 26, 2017Applicant: Mitsubishi Electric CorporationInventors: Mai UENAKA, Yuta KOMATSU, Matahiko IKEDA
-
Publication number: 20170271989Abstract: An object of this invention is to obtain a control apparatus and a control method for a DC/DC converter, with which a DC/DC converter can be controlled with superior stability and responsiveness while reducing the size of a storage medium. A calculation value is calculated in accordance with a specific control method using a differential voltage between a target output voltage and an output voltage, whereupon a control calculation value is calculated from the calculation value and an input voltage.Type: ApplicationFiled: September 8, 2016Publication date: September 21, 2017Applicant: Mitsubishi Electric CorporationInventors: Matahiko IKEDA, Mai UENAKA, Yuta KOMATSU, Ryota KONDO, Masaru KOBAYASHI, Nobuhiro KIHARA, Naoki MORITAKE
-
Publication number: 20170250617Abstract: A DC/DC converter includes: duty command calculation units for calculating duty command values for first, second, third, and fourth switching elements on the basis of difference voltage between a high-voltage-side voltage command value and a high-voltage-side voltage detection value; and a phase shift duty command calculation unit for calculating a phase shift duty command value corresponding to a phase difference between gate signals for the first and fourth switching elements and gate signals for the second and third switching elements, on the basis of difference voltage between a voltage target value and a charge voltage detection value of a charge/discharge capacitor, wherein gate signals for driving the first, second, third, fourth switching elements are generated on the basis of the duty command values and the phase shift duty command value.Type: ApplicationFiled: January 28, 2016Publication date: August 31, 2017Applicant: Mitsubishi Electric CorporationInventors: Ryota KONDO, Mai UENAKA, Matahiko IKEDA