Patents by Inventor Takuya Sakai

Takuya Sakai 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).

  • Publication number: 20190249934
    Abstract: Conditions are found for a heat sink having the highest heat exchange performance on the basis of mutual relationship among thickness of each plate, slit pitch, and horizontal rib, in a laminated heat sink core in which numerous parallel slits are punched in a plate, slender vertical ribs are disposed therebetween and the plate is laminated.
    Type: Application
    Filed: July 5, 2017
    Publication date: August 15, 2019
    Inventors: Takuya BUNGO, Atsushi OKUBO, Taiji SAKAI
  • Patent number: 10316782
    Abstract: A pressure reducing valve control apparatus is provided for a fuel supply system having a common rail and a pressure reducing valve to control rail pressure in the common rail by controlling a current supply state of the pressure reducing valve. The pressure reducing valve operates to open a valve body for discharging fuel from the common rail against a biasing force applied in a valve-closing direction by fuel-generated valve-opening force biasing the valve body in a valve-opening direction by the rail pressure and an electromagnetic force generated by current supply to an electromagnetic coil. The ECU starts to open the valve body during a period of holding a hold value by holding current supplied to the electromagnetic coil at a predetermined hold value after starting current supply to the electromagnetic coil. The ECU sets the hold value to increase as the rail pressure decreases.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: June 11, 2019
    Assignee: DENSO CORPORATION
    Inventors: Takuya Sakai, Hiroyuki Nishimura
  • Patent number: 10309729
    Abstract: A corrugated fin heat exchanger is provided in which the direction in which louvers are cut and raised is inclined in one direction only, and in which heat transfer performance is improved above that of conventional fins. To accomplish this, the relationship H>Qup/(Qup?1)×?H is satisfied. H represents the core height of the heat exchanger, Qup represents the ratio of the amount of heat exchanged per corrugation between one-directional louver fins and multi-directional louver fins in an airflow part, and ?H represents the amount of increase in a heat transfer reduction region of a heat exchanger core as a result of changing from multi-directional louver fins to one-directional louver fins.
    Type: Grant
    Filed: May 25, 2015
    Date of Patent: June 4, 2019
    Assignee: T.RAD Co., Ltd.
    Inventors: Takuya Bungo, Atsushi Okubo, Taiji Sakai, Hirotaka Ueki, Kazuo Maegawa
  • Patent number: 10250124
    Abstract: During regenerative control of an inverter circuit, when a path between a DC power supply and a smoothing capacitor is in a disconnection state, a control circuit of a power conversion device performs control while switching between first control in which upper switching elements within the inverter circuit are turned on and all lower switching elements are turned off and second control in which the lower switching elements are turned on and all the upper switching elements are turned off, every predetermined switching period.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: April 2, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kosuke Nakano, Takuya Sakai, Hiroyasu Iwabuki
  • Publication number: 20180278144
    Abstract: During regenerative control of an inverter circuit, when a path between a DC power supply and a smoothing capacitor is in a disconnection state, a control circuit of a power conversion device performs control while switching between first control in which upper switching elements within the inverter circuit are turned on and all lower switching elements are turned off and second control in which the lower switching elements are turned on and all the upper switching elements are turned off, every predetermined switching period.
    Type: Application
    Filed: January 22, 2016
    Publication date: September 27, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kosuke NAKANO, Takuya SAKAI, Hiroyasu IWABUKI
  • Publication number: 20180087463
    Abstract: A pressure reducing valve control apparatus is provided for a fuel supply system having a common rail and a pressure reducing valve to control rail pressure in the common rail by controlling a current supply state of the pressure reducing valve. The pressure reducing valve operates to open a valve body for discharging fuel from the common rail against a biasing force applied in a valve-closing direction by fuel-generated valve-opening force biasing the valve body in a valve-opening direction by the rail pressure and an electromagnetic force generated by current supply to an electromagnetic coil. The ECU starts to open the valve body during a period of holding a hold value by holding current supplied to the electromagnetic coil at a predetermined hold value after starting current supply to the electromagnetic coil. The ECU sets the hold value to increase as the rail pressure decreases.
    Type: Application
    Filed: September 19, 2017
    Publication date: March 29, 2018
    Inventors: Takuya SAKAI, Hiroyuki NISHIMURA
  • Patent number: 9608618
    Abstract: A temperature detection circuit for detecting a temperature of a switching element, a current source for causing a forward current to flow to the temperature detection circuit, an amplifier circuit for amplifying a forward voltage of the temperature detection circuit, a current adjustment circuit for adjusting a magnitude of a gate current to the switching element on the basis of an output voltage of the amplifier circuit, and a drive circuit for receiving an external signal and turning ON/OFF the switching element, are included. The magnitude of the gate current caused to flow from the current adjustment circuit to the gate electrode of the switching element is adjusted on the basis of a change in a magnitude of the forward voltage corresponding to a change in the temperature of the temperature detection circuit.
    Type: Grant
    Filed: January 29, 2014
    Date of Patent: March 28, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Sakai, Hiroshi Nakatake
  • Publication number: 20150358013
    Abstract: A temperature detection circuit for detecting a temperature of a switching element, a current source for causing a forward current to flow to the temperature detection circuit, an amplifier circuit for amplifying a forward voltage of the temperature detection circuit, a current adjustment circuit for adjusting a magnitude of a gate current to the switching element on the basis of an output voltage of the amplifier circuit, and a drive circuit for receiving an external signal and turning ON/OFF the switching element, are included. The magnitude of the gate current caused to flow from the current adjustment circuit to the gate electrode of the switching element is adjusted on the basis of a change in a magnitude of the forward voltage corresponding to a change in the temperature of the temperature detection circuit.
    Type: Application
    Filed: January 29, 2014
    Publication date: December 10, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takuya SAKAI, Hiroshi NAKATAKE
  • Patent number: 9161261
    Abstract: A communication speed control system to be placed between service providing servers on the Internet and smartphones, the communication speed control system including: a traffic storing unit a non-regulated IP address storing unit for registering IP addresses of the servers a packet reading unit for extracting an IP address of the server from the packet; a traffic management unit for calculating cumulative data traffic of the IP address in question a handling rule management unit for determining that a band limitation is required when the cumulative data traffic exceeds a threshold value and the IP address in question is not registered as a non-regulated IP address, and determining that a band limitation is not required when the cumulative data traffic does not exceed the threshold value and a packet transmission unit for transmitting a packet at a normal communication speed.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: October 13, 2015
    Assignee: ACTIS CORPORATION
    Inventors: Yoshiaki Higashino, Toshihiro Sano, Noriyuki Haneda, Takuya Sakai
  • Patent number: 9099945
    Abstract: In a system supplying power from an AC power supply to a three-phase motor via a converter and an inverter, a leakage current reducing apparatus is connected to a connection line between the AC power supply and the converter. A common mode transformer detects, as common mode voltage, common mode current flowing from the AC power supply to the connection line. The common mode voltage is inputted to a voltage amplifier via a filter apparatus. Output voltage obtained by voltage amplification passes through a capacitor and then is applied as an AC component to a neutral point of capacitors connected in a Y-connection fashion, so as to have the same phase as that of the common mode voltage. Thus, current having the same phase as that of the common mode current is supplied via the capacitors to the converter through the connection line, thereby reducing the common mode current.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: August 4, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Sakai, Satoshi Azuma
  • Publication number: 20150213912
    Abstract: A polycapillary lens has a plurality of capillaries, extending from one end face to the other end face and configured to guide radiation or a particle beam input into the one end face, to the other end face, and has a plurality of concentric areas A1, A2 in a plane intersecting with a guide direction of the radiation or the particle beam. In addition, an inside diameter La of the capillaries included in the area A1 is different from an inside diameter Lb of the capillaries included in the area A2.
    Type: Application
    Filed: September 9, 2013
    Publication date: July 30, 2015
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Takuya Sakai, Yutaro Suzuki
  • Publication number: 20150003124
    Abstract: In a system line for supplying power from an AC power source to a load through a converter and an inverter, a noise reduction unit is connected to a single connection line between the AC power source and the converter. In the noise reduction unit, a current transformer detects a noise current flowing through the connection line after converting it to a voltage, and the detected voltage V1 is supplied through a filter device to a voltage amplifier followed by being voltage-amplified and applied to a capacitor. The capacitor is connected to an injection point on the connection line, so that a high-frequency current in the same direction as the noise current is supplied to the converter from the connection line, to thereby reduce a high-frequency noise current at the AC power source side.
    Type: Application
    Filed: May 29, 2012
    Publication date: January 1, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takuya Sakai, Satoshi Azuma
  • Publication number: 20140204756
    Abstract: A communication speed control system to be placed between service providing servers on the Internet and smartphones, the communication speed control system including: a traffic storing unit a non-regulated IP address storing unit for registering IP addresses of the servers a packet reading unit for extracting an IP address of the server from the packet; a traffic management unit for calculating cumulative data traffic of the IP address in question a handling rule management unit for determining that a band limitation is required when the cumulative data traffic exceeds a threshold value and the IP address in question is not registered as a non-regulated IP address, and determining that a band limitation is not required when the cumulative data traffic does not exceed the threshold value and a packet transmission unit for transmitting a packet at a normal communication speed.
    Type: Application
    Filed: June 25, 2012
    Publication date: July 24, 2014
    Applicant: ACTIS CORPORATION
    Inventors: Yoshiaki Higashino, Toshihiro Sano, Noriyuki Haneda, Takuya Sakai
  • Patent number: 8755205
    Abstract: Three-phase windings 11-13 and 21-23 of a first common-mode transformer 1 and a second common-mode transformer 2 are connected in series through connecting lines 8r-8t, respectively. The windings 11-13 are connected to an unillustrated AC power supply by connecting lines 91r-91t. The windings 21-23 are connected to a three-phase motor by connecting lines 93r-93t and through a converter and an inverter which are unillustrated. A winding 14 for common-mode voltage detection detects high-frequency leakage currents flowing through the connecting lines 91r-91t as a common-mode voltage V1, and an output voltage V2 obtained by voltage amplification by a voltage amplifier 3 is applied to a winding 24 for common-mode voltage application in such a manner that the output voltage V2 works in generally the same direction as the common-mode voltage V1, thereby canceling out the high-frequency leakage currents through the windings 21-23.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: June 17, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Satoshi Azuma, Takuya Sakai
  • Patent number: 8649193
    Abstract: First windings of a first common mode transformer and second windings of a second common mode transformer are connected in series via connection lines. The windings are connected to an AC power supply via connection lines. The first windings are connected to a three-phase motor via connection lines, a converter, and an inverter. High-frequency leakage currents flowing in the connection lines are detected as a common mode voltage by a winding for common mode voltage detection. An output voltage is inputted via a filter to a voltage amplifier unit that amplifies the output voltage, and the amplified voltage is applied to a winding via a capacitor in substantially a same direction as a direction of the common mode voltage. As a result, leakage currents are reduced by induced voltages on the windings.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: February 11, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Sakai, Satoshi Azuma
  • Publication number: 20130147419
    Abstract: In a system supplying power from an AC power supply to a three-phase motor via a converter and an inverter, a leakage current reducing apparatus is connected to a connection line between the AC power supply and the converter. A common mode transformer detects, as common mode voltage, common mode current flowing from the AC power supply to the connection line. The common mode voltage is inputted to a voltage amplifier via a filter apparatus. Output voltage obtained by voltage amplification passes through a capacitor and then is applied as an AC component to a neutral point of capacitors connected in a Y-connection fashion, so as to have the same phase as that of the common mode voltage. Thus, current having the same phase as that of the common mode current is supplied via the capacitors to the converter through the connection line, thereby reducing the common mode current.
    Type: Application
    Filed: June 16, 2011
    Publication date: June 13, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takuya Sakai, Satoshi Azuma
  • Publication number: 20130010506
    Abstract: First windings of a first common mode transformer and second windings of a second common mode transformer are connected in series via connection lines. The windings are connected to an AC power supply via connection lines. The first windings are connected to a three-phase motor via connection lines, a converter, and an inverter. High-frequency leakage currents flowing in the connection lines are detected as a common mode voltage by a winding for common mode voltage detection. An output voltage is inputted via a filter to a voltage amplifier unit that amplifies the output voltage, and the amplified voltage is applied to a winding via a capacitor in substantially a same direction as a direction of the common mode voltage. As a result, leakage currents are reduced by induced voltages on the windings.
    Type: Application
    Filed: April 1, 2011
    Publication date: January 10, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Takuya Sakai, Satoshi Azuma
  • Publication number: 20110317455
    Abstract: Three-phase windings 11-13 and 21-23 of a first common-mode transformer 1 and a second common-mode transformer 2 are connected in series through connecting lines 8r-8t, respectively. The windings 11-13 are connected to an unillustrated AC power supply by connecting lines 91r-91t. The windings 21-23 are connected to a three-phase motor by connecting lines 93r-93t and through a converter and an inverter which are unillustrated. A winding 14 for common-mode voltage detection detects high-frequency leakage currents flowing through the connecting lines 91r-91t as a common-mode voltage V1, and an output voltage V2 obtained by voltage amplification by a voltage amplifier 3 is applied to a winding 24 for common-mode voltage application in such a manner that the output voltage V2 works in generally the same direction as the common-mode voltage V1, thereby canceling out the high-frequency leakage currents through the windings 21-23.
    Type: Application
    Filed: March 4, 2010
    Publication date: December 29, 2011
    Applicant: Mitsubishi Electric Corporation
    Inventors: Satoshi Azuma, Takuya Sakai
  • Patent number: 7973493
    Abstract: In order to enhance stability of a discharge lamp at the time of dimming lighting even in the case where a light output is lowered, a direct current superimposing circuit superimposes a direct current voltage on an alternating current voltage applied to a fluorescent lamp, and a dimming signal correction circuit receives a detection value of a direct current voltage detection circuit and a dimming signal that is from an outside, outputs a dimming signal higher in level than the dimming signal in the case where the detection value of the direct current voltage detection circuit exceeds a first threshold value, and decreases the level of the outputted dimming signal to the level of the inputted dimming signal in the case where the detection value of the direct current voltage detection circuit falls down below a second threshold value that is equal to or less than the first threshold value.
    Type: Grant
    Filed: August 27, 2007
    Date of Patent: July 5, 2011
    Assignees: Panasonic Electric Works Co., Ltd., Ikeda Electric Co., Ltd.
    Inventors: Naoki Onishi, Tetsuya Hamana, Keisuke Ueda, Kouichi Ikegami, Kazuhiko Tachibana, Takuya Sakai
  • Publication number: 20100013393
    Abstract: In order to enhance stability of a discharge lamp at the time of dimming lighting even in the case where a light output is lowered, a direct current superimposing circuit superimposes a direct current voltage on an alternating current voltage applied to a fluorescent lamp, and a dimming signal correction circuit receives a detection value of a direct current voltage detection circuit and a dimming signal that is from an outside, outputs a dimming signal higher in level than the dimming signal in the case where the detection value of the direct current voltage detection circuit exceeds a first threshold value, and decreases the level of the outputted dimming signal to the level of the inputted dimming signal in the case where the detection value of the direct current voltage detection circuit falls down below a second threshold value that is equal to or less than the first threshold value.
    Type: Application
    Filed: August 27, 2007
    Publication date: January 21, 2010
    Applicants: PANASONIC ELECTRIC WORKS CO., LTD., IKEDA ELECTRIC CO., LTD.
    Inventors: Naoki Onishi, Tetsuya Hamana, Keisuke Ueda, Kouichi Ikegami, Kazuhiko Tachibana, Takuya Sakai