Patents by Inventor Akihide Shibata

Akihide Shibata 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: 10976276
    Abstract: A nanofiber sensor includes a plurality of pairs of electrodes and nanofibers respectively bridging the gaps between the electrodes in the pair, between the electrodes in the pair, and between the electrodes in the pair. At least two pairs of electrodes of the plurality of pairs of electrodes are different from each other in structures.
    Type: Grant
    Filed: April 17, 2017
    Date of Patent: April 13, 2021
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Shinichi Handa, Takuya Sato, Akihide Shibata, Hiroshi Iwata
  • Patent number: 10778109
    Abstract: A power supply includes a primary circuit connected to a primary winding of a transformer and a secondary circuit connected to a secondary winding of the transformer. The primary circuit includes MOSFETs, and the secondary circuit includes MOSFETs configured to rectify power transmitted from a primary side of the transformer and includes a capacitor configured to store the rectified power. The secondary circuit performs a discharge operation of discharging the capacitor and causing a current to flow into the secondary winding of the transformer to reduce a source-drain voltage of the MOSFETs before the MOSFETs are switched from an off state to an on state. Thus, the power supply having a high power-conversion efficiency even during low output is provided.
    Type: Grant
    Filed: January 29, 2018
    Date of Patent: September 15, 2020
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Takeshi Shiomi, Akihide Shibata, Hiroshi Iwata
  • Publication number: 20200235673
    Abstract: A power supply includes a primary circuit connected to a primary winding of a transformer and a secondary circuit connected to a secondary winding of the transformer. The primary circuit includes MOSFETs, and the secondary circuit includes MOSFETs configured to rectify power transmitted from a primary side of the transformer and includes a capacitor configured to store the rectified power. The secondary circuit performs a discharge operation of discharging the capacitor and causing a current to flow into the secondary winding of the transformer to reduce a source-drain voltage of the MOSFETs before the MOSFETs are switched from an off state to an on state. Thus, the power supply having a high power-conversion efficiency even during low output is provided.
    Type: Application
    Filed: January 29, 2018
    Publication date: July 23, 2020
    Inventors: TAKESHI SHIOMI, AKIHIDE SHIBATA, HIROSHI IWATA
  • Publication number: 20190386574
    Abstract: A power supply includes a transformer including a primary winding and a plurality of secondary windings, a primary circuit connected to the primary winding; and a plurality of secondary circuits connected to the plurality of secondary windings, respectively. The secondary circuit performs a power regeneration operation of transmitting power to the primary circuit or the secondary circuit. The secondary circuit includes MOSFETs configured to rectify the power transmitted from a primary side of the transformer and a capacitor configured to store the power that is rectified and is configured to perform a discharge operation of discharging the capacitor and causing a current to flow into a secondary winding of the plurality of secondary windings of the transformer. Thus, the power supply capable of stably outputting a plurality of voltages and having a high power-conversion efficiency is provided.
    Type: Application
    Filed: January 29, 2018
    Publication date: December 19, 2019
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: TAKESHI SHIOMI, AKIHIDE SHIBATA, HIROSHI IWATA
  • Publication number: 20190242843
    Abstract: A nanofiber sensor includes a plurality of pairs of electrodes and nanofibers respectively bridging the gaps between the electrodes in the pair, between the electrodes in the pair, and between the electrodes in the pair. At least two pairs of electrodes of the plurality of pairs of electrodes are different from each other in structures.
    Type: Application
    Filed: April 17, 2017
    Publication date: August 8, 2019
    Inventors: SHINICHI HANDA, TAKUYA SATO, AKIHIDE SHIBATA, HIROSHI IWATA
  • Publication number: 20190214851
    Abstract: A power supply device including at least two power transmission coils is provided. The directions of the planes of at least two power transmission coils are different from each other. The frequencies of the at least two power transmission coils are different from each other. Preferably, the at least two power transmission coils include at least three power transmission coils. The directions of the planes of the at least three power transmission coils are different from each other.
    Type: Application
    Filed: May 12, 2017
    Publication date: July 11, 2019
    Inventors: MASATO SASAKI, HIROSHI KOTAKI, HIROSHI KAWAMURA, AKIHIDE SHIBATA, HIROSHI ITOH
  • Patent number: 9998019
    Abstract: A DC-DC converter includes a transformer, a switching circuit provided on the primary side of the transformer, and a rectifier circuit provided on the secondary side of the transformer. The rectifier circuit includes a first rectifier part that is serially connected body of a first transistor and a second transistor having a first electrode connected to a second electrode of the first transistor. The first and second transistors each include a parasitic diode connected forward between the second and first electrode, and the withstanding voltage between the first and second electrodes of the first transistor is higher than the withstanding voltage between the first and second electrodes of the second transistor.
    Type: Grant
    Filed: September 30, 2013
    Date of Patent: June 12, 2018
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Kenji Komiya, Takeshi Shiomi, Masaru Nomura, Akihide Shibata, Hiroshi Iwata
  • Patent number: 9991415
    Abstract: A configuration of a display device capable of color display is obtained. The display device includes a plurality of rod-shaped light-emitting elements each of which includes a semiconductor and which emit light beams having wavelength distributions different from each other, and alignment electrodes (12). The alignment electrodes (12) include a first electrode pair (12a), a second electrode pair (12b), and a third electrode pair (12c).
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: June 5, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Nobuaki Teraguchi, Takuya Sato, Keiji Watanabe, Kohichiroh Adachi, Akihide Shibata, Hiroshi Iwata
  • Patent number: 9935551
    Abstract: A high-withstand-voltage normally-on transistor and a low-withstand-voltage normally-off transistor are connected in series, and diodes are provided in reverse parallel to the transistor. A gate terminal of the transistor is connected to a source terminal of the transistor, and a gate driving circuit that outputs a control signal to a gate terminal of the transistor is provided. Forward voltage of the diode is made lower than forward voltage of the diode, and an inductance component of a path connecting nodes via the diode is made greater than an inductance component of a path connecting the nodes via the diode. Accordingly, a switching circuit which includes transistors connected in series and in which transient current at a time of turning off is reduced is provided.
    Type: Grant
    Filed: February 24, 2015
    Date of Patent: April 3, 2018
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kohtaroh Kataoka, Takeshi Shiomi, Shuji Wakaiki, Hiroki Igarashi, Akihide Shibata, Hiroshi Iwata
  • Patent number: 9831756
    Abstract: The switching power supply device is provided with a high-withstand voltage first transistor, a first electrode of which being connected to a first node; a low-withstand voltage second transistor, a first electrode of which being connected to a second electrode of the first transistor, and a second electrode of which being connected to a second node; and a drive circuit. Each of the first and second transistors has a parasitic diode connected in the forward direction between the second and first electrodes. The drive circuit, in a case where electrical current is to flow from the first node to the second node, turns on the first and second transistors, and, in a case where electrical current is to flow from the second node to the first node, turns on the first transistor, and turns off the second transistor.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: November 28, 2017
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kenji Komiya, Shuji Wakaiki, Akihide Shibata, Hiroshi Iwata
  • Publication number: 20170338372
    Abstract: A configuration of a display device capable of color display is obtained. The display device includes a plurality of rod-shaped light-emitting elements each of which includes a semiconductor and which emit light beams having wavelength distributions different from each other, and alignment electrodes (12). The alignment electrodes (12) include a first electrode pair (12a), a second electrode pair (12b), and a third electrode pair (12c).
    Type: Application
    Filed: November 18, 2015
    Publication date: November 23, 2017
    Inventors: Nobuaki TERAGUCHI, Takuya SATO, Keiji WATANABE, Kohichiroh ADACHI, Akihide SHIBATA, Hiroshi IWATA
  • Patent number: 9793793
    Abstract: A power factor correction circuit includes: a coil and MOSFETs that boost an input voltage to generate a boosted voltage; a first capacitor having one end connected to a first output terminal, and the other end connected to an intermediate node; and a second capacitor having one end connected to the intermediate node, and the other end connected to a second output terminal. In a first operation mode, the boosted vol tage is applied to the two ends of the first capacitor when a positive voltage is input, and applied to the two ends of the second capacitor when a negative voltage is input. In a second operation mode, the boosted voltage is applied to two ends of the first and second capacitors connected in series. Thus, there is provided a power factor correction circuit which has a high efficiency and is compatible with an input voltage in a broad range.
    Type: Grant
    Filed: June 9, 2016
    Date of Patent: October 17, 2017
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Kohtaroh Kataoka, Masaru Nomura, Shuji Wakaiki, Hiroki Igarashi, Akihide Shibata, Hiroshi Iwata, Takeshi Shiomi
  • Patent number: 9755498
    Abstract: A boost circuit includes multiple switching circuits connected in parallel. Each switching circuit includes first through third transistors and a resistor. The first transistor, the resistor, and the second transistor are serially connected between first and second nodes. The third transistor is connected between the source of the first transistor and the second node. A conductance Gm (S) of the second transistor and a resistance r (?) of the resistor are respectively configured to be within ranges of 1?Gm?1000 and 7×Gm?1.6?r?170×Gm?1. Since the first transistor having a high breakdown voltage is turned on by turning on the second transistor, variations in turn-on time of the boost circuit are reduced.
    Type: Grant
    Filed: July 20, 2016
    Date of Patent: September 5, 2017
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Shuji Wakaiki, Akihide Shibata, Hiroshi Iwata
  • Patent number: 9698710
    Abstract: A solar energy utilization system includes a solar panel, a motor driven by an inverter circuit functioning as a motor drive circuit with power output by the solar panel, a solar output voltage monitor functioning as a monitor that monitors an input or an output of the solar panel and also functioning as a monitor that monitors an input or an output of the inverter circuit, and a controller. The controller has a control mode in which the inverter circuit is controlled such that an output voltage of the solar panel is maintained at a voltage higher than a maximum power point voltage. In this control mode, the controller performs the control such that a rotation speed of the motor is changed repeatedly at predetermined timings.
    Type: Grant
    Filed: April 7, 2014
    Date of Patent: July 4, 2017
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kohtaroh Kataoka, Masaru Nomura, Takeshi Shiomi, Shuji Wakaiki, Akihide Shibata, Hiroshi Iwata
  • Patent number: 9660513
    Abstract: A control circuit is driven by a driving voltage (VOC) generated by a generator circuit, and outputs a control signal. A drive circuit is driven by a driving voltage (VOD) generated by another generator circuit, and turns a switching element inside a switching circuit on or off by supplying, to the switching circuit, a drive signal based on the control signal. During activation of a switching device, a voltage generation controller detects a voltage value of the output voltage (VOC) of the generator circuit, and allows activation of the other generator circuit after verifying that the detected voltage value is at or above a designated threshold.
    Type: Grant
    Filed: March 24, 2014
    Date of Patent: May 23, 2017
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Kohtaroh Kataoka, Masaru Nomura, Takeshi Shiomi, Shuji Wakaiki, Akihide Shibata, Hiroshi Iwata
  • Patent number: 9627973
    Abstract: A highly efficient and low-cost switching power supply device includes a high withstand voltage transistor and a low withstand voltage transistor. When current flows from a second node to a first node, the high withstand voltage transistor turns on and the low withstand voltage transistor turns off, causing current to flow through a built-in diode of the low withstand voltage transistor. Since current does not flow through the parasitic diode of the high withstand voltage transistor, the recovery current is reduced. Furthermore, since a first delay circuit including resistors and a diode is connected to the gate electrode of the high withstand voltage transistor, and a second delay circuit including resistors and a diode is connected to the gate electrode of the low withstand voltage transistor, precise adjustment of the switching speed during switching operation is possible, and losses are reduced.
    Type: Grant
    Filed: March 14, 2014
    Date of Patent: April 18, 2017
    Assignee: SHARP KABUSHIKI KAISHA
    Inventors: Akihide Shibata, Shuji Wakaiki, Kohtaroh Kataoka, Takeshi Shiomi, Hiroki Igarashi, Hiroshi Iwata
  • Publication number: 20170104416
    Abstract: A high-withstand-voltage normally-on transistor and a low-withstand-voltage normally-off transistor are connected in series, and diodes are provided in reverse parallel to the transistor. A gate terminal of the transistor is connected to a source terminal of the transistor, and a gate driving circuit that outputs a control signal to a gate terminal of the transistor is provided. Forward voltage of the diode is made lower than forward voltage of the diode, and an inductance component of a path connecting nodes via the diode is made greater than an inductance component of a path connecting the nodes via the diode. Accordingly, a switching circuit which includes transistors connected in series and in which transient current at a time of turning off is reduced is provided.
    Type: Application
    Filed: February 24, 2015
    Publication date: April 13, 2017
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Kohtaroh KATAOKA, Takeshi SHIOMI, Shuji WAKAIKI, Hiroki IGARASHI, Akihide SHIBATA, Hiroshi IWATA
  • Publication number: 20170093272
    Abstract: A boost circuit includes multiple switching circuits connected in parallel. Each switching circuit includes first through third transistors and a resistor. The first transistor, the resistor, and the second transistor are serially connected between first and second nodes. The third transistor is connected between the source of the first transistor and the second node. A conductance Gm (S) of the second transistor and a resistance r (?) of the resistor are respectively configured to be within ranges of 1?Gm?1000 and 7×Gm?1.6?r?170×Gm?1. Since the first transistor having a high breakdown voltage is turned on by turning on the second transistor, variations in turn-on time of the boost circuit are reduced.
    Type: Application
    Filed: July 20, 2016
    Publication date: March 30, 2017
    Inventors: Shuji WAKAIKI, Akihide SHIBATA, Hiroshi IWATA
  • Publication number: 20170012546
    Abstract: A DC-DC converter includes a transformer, a switching circuit provided on the primary side of the transformer, and a rectifier circuit provided on the secondary side of the transformer. The rectifier circuit includes a first rectifier part that is serially connected body of a first transistor and a second transistor having a first electrode connected to a second electrode of the first transistor. The first and second transistors each include a parasitic diode connected forward between the second and first electrode, and the withstanding voltage between the first and second electrodes of the first transistor is higher than the withstanding voltage between the first and second electrodes of the second transistor.
    Type: Application
    Filed: September 30, 2013
    Publication date: January 12, 2017
    Applicant: SHARP KABUSHIKI KAISHA
    Inventors: Kenji KOMIYA, Takeshi SHIOMI, Masaru NOMURA, Akihide SHIBATA, Hiroshi IWATA
  • Publication number: 20160380531
    Abstract: A power factor correction circuit includes: a coil and MOSFETs that boost an input voltage to generate a boosted voltage; a first capacitor having one end connected to a first output terminal, and the other end connected to an intermediate node; and a second capacitor having one end connected to the intermediate node, and the other end connected to a second output terminal. In a first operation mode, the boosted vol tage is applied to the two ends of the first capacitor when a positive voltage is input, and applied to the two ends of the second capacitor when a negative voltage is input. In a second operation mode, the boosted voltage is applied to two ends of the first and second capacitors connected in series. Thus, there is provided a power factor correction circuit which has a high efficiency and is compatible with an input voltage in a broad range.
    Type: Application
    Filed: June 9, 2016
    Publication date: December 29, 2016
    Applicant: Sharp Kabushiki Kaisha
    Inventors: Kohtaroh KATAOKA, Masaru NOMURA, Shuji WAKAIKI, Hiroki IGARASHI, Akihide SHIBATA, Hiroshi IWATA, Takeshi SHIOMI