Patents by Inventor Yoichi Tokai
Yoichi Tokai 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: 20210298148Abstract: A DC-DC power supply according to an embodiment includes a voltage converter, a first switching element, a second switching element, and a controller. The voltage converter converts an input voltage into a first voltage. The first switching element performs switching according to a pulse signal to thereby intermit the first voltage applied to one end of a load. One end of the second switching element is connected to the other end of the load. The second switching element performs an ON/OFF operation at a predetermined advance time with respect to the first switching element. The controller controls, based on a voltage at the other end of the second switching element in a one-voltage holder, the first voltage output by the voltage converter.Type: ApplicationFiled: September 4, 2020Publication date: September 23, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventors: Yoichi TOKAI, Toru TAKAYAMA
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Patent number: 10903832Abstract: A current drive circuit has a first transistor that outputs a current, a second transistor connected to the first transistor by cascode connection, a third transistor connected to the second transistor by cascode connection, a first current source that supplies a current to the third transistor and the second transistor, a fourth transistor that shares a gate with the third transistor, a fifth transistor that is connected to the fourth transistor by cascode connection and shares a gate with the second transistor, a second current source that supplies a current to the fourth transistor and the fifth transistor, a sixth transistor that shares a gate with the third transistor and the fourth transistor and controls a gate voltage of the first transistor, and a third current source that supplies a drain current of the sixth transistor.Type: GrantFiled: March 11, 2019Date of Patent: January 26, 2021Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventor: Yoichi Tokai
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Publication number: 20190296733Abstract: A current drive circuit has a first transistor that outputs a current, a second transistor connected to the first transistor by cascode connection, a third transistor connected to the second transistor by cascode connection, a first current source that supplies a current to the third transistor and the second transistor, a fourth transistor that shares a gate with the third transistor, a fifth transistor that is connected to the fourth transistor by cascode connection and shares a gate with the second transistor, a second current source that supplies a current to the fourth transistor and the fifth transistor, a sixth transistor that shares a gate with the third transistor and the fourth transistor and controls a gate voltage of the first transistor, and a third current source that supplies a drain current of the sixth transistor.Type: ApplicationFiled: March 11, 2019Publication date: September 26, 2019Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATIONInventor: Yoichi TOKAI
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Patent number: 10128849Abstract: According to one embodiment, a level shift circuit includes a first transistor, a second transistor, third transistor, fourth transistor, fifth transistor, sixth transistor, seventh transistor and eighth transistor. The level shift circuit also includes a first capacitance element, a second capacitance element, third capacitance element and fourth capacitance element. The first through eighth transistors have a first conductivity type. The first through fourth transistors are included to a bi-stable multi-vibrator. The fifth through the eighth transistors are included to an active load for the differential input of the signal through the third capacitance element and the fourth capacitance element.Type: GrantFiled: August 4, 2016Date of Patent: November 13, 2018Assignee: Kabushiki Kaisha ToshibaInventor: Yoichi Tokai
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Patent number: 9680466Abstract: The analog switch includes a first DMOS transistor of a second conductivity type that is connected to an input terminal at a first end of a current path thereof and to the gate of the first MOS transistor at a second end of the current path, and is controlled in accordance with the second current. The analog switch includes a second DMOS transistor of the second conductivity type that is connected to the second end of the current path of the first DMOS transistor at a first end of a current path thereof and to an output terminal at a second end of the current path and is controlled in accordance with the second current. The analog switch includes a first switch element that is connected between a gate and the second end of the current path of the first DMOS transistor.Type: GrantFiled: September 8, 2015Date of Patent: June 13, 2017Assignee: Kabushiki Kaisha ToshibaInventor: Yoichi Tokai
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Publication number: 20170104489Abstract: According to one embodiment, a level shift circuit includes a first transistor, a second transistor, third transistor, fourth transistor, fifth transistor, sixth transistor, seventh transistor and eighth transistor. The level shift circuit also includes a first capacitance element, a second capacitance element, third capacitance element and fourth capacitance element. The first through eighth transistors have a first conductivity type. The first through fourth transistors are included to a bi-stable multi-vibrator. The fifth through the eighth transistors are included to an active load for the differential input of the signal through the third capacitance element and the fourth capacitance element.Type: ApplicationFiled: August 4, 2016Publication date: April 13, 2017Inventor: Yoichi Tokai
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Publication number: 20160204780Abstract: The analog switch includes a first DMOS transistor of a second conductivity type that is connected to an input terminal at a first end of a current path thereof and to the gate of the first MOS transistor at a second end of the current path, and is controlled in accordance with the second current. The analog switch includes a second DMOS transistor of the second conductivity type that is connected to the second end of the current path of the first DMOS transistor at a first end of a current path thereof and to an output terminal at a second end of the current path and is controlled in accordance with the second current. The analog switch includes a first switch element that is connected between a gate and the second end of the current path of the first DMOS transistor.Type: ApplicationFiled: September 8, 2015Publication date: July 14, 2016Inventor: Yoichi Tokai
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Patent number: 9178428Abstract: The step-down switching circuit includes an amplifier capacitor having a first end connected to the feedback terminal and a second end connected to a second input of the amplifier. The step-down switching circuit includes a first resistor having a first end connected to the first end of the amplifier capacitor. The step-down switching circuit includes a second resistor having a first end connected to a second end of the first resistor and a second end connected to an output of the amplifier. The step-down switching circuit includes a third resistor having a first end connected to the second end of the first resistor and a second end connected to the second end of the amplifier capacitor.Type: GrantFiled: August 29, 2013Date of Patent: November 3, 2015Assignee: Kabushiki Kaisha ToshibaInventor: Yoichi Tokai
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Patent number: 8963522Abstract: According to one embodiment, a circuit includes an amplifier, first and second capacitors, a switch and a monitoring-comparator. The amplifier amplifies source and drain voltages to output first and second amplified-signals. The first and second capacitors are connected to the amplifier's first and second terminals. The first and second amplified-signals are outputted from the first and second terminals. The switch forms first and second loops when a switching-transistor is OFF. The switch supplies a common-reference-voltage to the first and second loops to store charge in the first and second capacitors. The switch ends the first and second loops based on a gate-signal when the switching-transistor is ON. The monitoring-comparator compares first and second inputs. The monitoring-comparator outputs a signal depending on a comparison result when the switching-transistor is ON. The first and second inputs are input through the first and second capacitors.Type: GrantFiled: January 23, 2012Date of Patent: February 24, 2015Assignee: Kabushiki Kaisha ToshibaInventors: Masafumi Otsuka, Yoichi Tokai
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Publication number: 20140266095Abstract: The step-down switching circuit includes an amplifier capacitor having a first end connected to the feedback terminal and a second end connected to a second input of the amplifier. The step-down switching circuit includes a first resistor having a first end connected to the first end of the amplifier capacitor. The step-down switching circuit includes a second resistor having a first end connected to a second end of the first resistor and a second end connected to an output of the amplifier. The step-down switching circuit includes a third resistor having a first end connected to the second end of the first resistor and a second end connected to the second end of the amplifier capacitor.Type: ApplicationFiled: August 29, 2013Publication date: September 18, 2014Applicant: KABUSHIKI KAISHA TOSHIBAInventor: Yoichi Tokai
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Patent number: 8797007Abstract: A DC-DC converter includes a smoothing capacitor connected between a first output terminal connected to a first end of a load and a second output terminal connected to a second end of the load, the smoothing capacitor smoothing an output voltage. The DC-DC converter includes a choke coil having a first end connected to a first end of a battery. The DC-DC converter includes a semiconductor integrated circuit having a switch terminal connected to a second end of the choke coil, a first potential terminal connected to the first output terminal, and a second potential terminal connected to the second output terminal and a second end of the battery.Type: GrantFiled: March 14, 2012Date of Patent: August 5, 2014Assignee: Kabushiki Kaisha ToshibaInventor: Yoichi Tokai
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Publication number: 20130141060Abstract: A DC-DC converter includes a smoothing capacitor connected between a first output terminal connected to a first end of a load and a second output terminal connected to a second end of the load, the smoothing capacitor smoothing an output voltage. The DC-DC converter includes a choke coil having a first end connected to a first end of a battery. The DC-DC converter includes a semiconductor integrated circuit having a switch terminal connected to a second end of the choke coil, a first potential terminal connected to the first output terminal, and a second potential terminal connected to the second output terminal and a second end of the battery.Type: ApplicationFiled: March 14, 2012Publication date: June 6, 2013Applicant: Kabushiki Kaisha ToshibaInventor: Yoichi TOKAI
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Publication number: 20120235656Abstract: According to one embodiment, a circuit includes an amplifier, first and second capacitors, a switch and a monitoring-comparator. The amplifier amplifies source and drain voltages to output first and second amplified-signals. The first and second capacitors are connected to the amplifier's first and second terminals. The first and second amplified-signals are outputted from the first and second terminals. The switch forms first and second loops when a switching-transistor is OFF. The switch supplies a common-reference-voltage to the first and second loops to store charge in the first and second capacitors. The switch ends the first and second loops based on a gate-signal when the switching-transistor is ON. The monitoring-comparator compares first and second inputs. The monitoring-comparator outputs a signal depending on a comparison result when the switching-transistor is ON. The first and second inputs are input through the first and second capacitors.Type: ApplicationFiled: January 23, 2012Publication date: September 20, 2012Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masafumi OTSUKA, Yoichi Tokai
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Patent number: 8207722Abstract: A boost DC/DC converter has a voltage dividing circuit connected between the output terminal and the ground, that outputs a divided voltage obtained by dividing the output voltage; a reference voltage generating circuit that generates a reference voltage based on the input voltage; an error amplifier that outputs a first signal corresponding to the difference between the divided voltage and the reference voltage; a feedforward circuit that detects the input voltage and outputs a second signal corresponding to a current inversely proportional to the input voltage; a multiplier that multiples the first signal by the second signal and outputs a third signal obtained; and a control circuit that outputs, based on the third signal, a control signal for controlling on/off of the switching transistor so that the divided voltage is equal to the reference voltage.Type: GrantFiled: August 25, 2009Date of Patent: June 26, 2012Assignee: Kabushiki Kaisha ToshibaInventors: Masafumi Otsuka, Yoichi Tokai, Ryo Tanifuji
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Publication number: 20110221415Abstract: According to one embodiment, a switching transistor changes, based on ON/OFF operations, the direction of an electric current flowing to an inductor. A gate driving unit applies a driving voltage to a gate of the switching transistor. A power-supply switching unit switches, based on a result of comparison of the input voltage and the output voltage, the voltage of a power supply that generates the driving voltage.Type: ApplicationFiled: March 7, 2011Publication date: September 15, 2011Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masafumi Otsuka, Yoichi Tokai, Ryo Tanifuji
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Publication number: 20100052627Abstract: A boost DC/DC converter has a voltage dividing circuit connected between the output terminal and the ground, that outputs a divided voltage obtained by dividing the output voltage; a reference voltage generating circuit that generates a reference voltage based on the input voltage; an error amplifier that outputs a first signal corresponding to the difference between the divided voltage and the reference voltage; a feedforward circuit that detects the input voltage and outputs a second signal corresponding to a current inversely proportional to the input voltage; a multiplier that multiples the first signal by the second signal and outputs a third signal obtained; and a control circuit that outputs, based on the third signal, a control signal for controlling on/off of the switching transistor so that the divided voltage is equal to the reference voltage.Type: ApplicationFiled: August 25, 2009Publication date: March 4, 2010Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Masafumi Otsuka, Yoichi Tokai, Ryo Tanifuji
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Patent number: 6696858Abstract: A semiconductor integrated circuit device includes a level-shifting circuit, a current mirror circuit and a switch circuit. The level-shifting circuit level-shifts an input signal having a first amplitude to an output signal having a second amplitude. The current mirror circuit charges or discharges an output node of the level-shifting circuit. The switch circuit operates the current mirror circuit during a period from the inversion of the input signal to the inversion of the output signal.Type: GrantFiled: September 5, 2001Date of Patent: February 24, 2004Assignee: Kabushiki Kaisha ToshibaInventor: Yoichi Tokai
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Publication number: 20020044171Abstract: An ink-jet recording apparatus according to the present invention, which records an image onto a recording medium by flying an ink-droplet from a surface of an ink by a pressure of ultrasonic beam, is characterized by comprising ultrasonic generating element array which has a plurality of ultrasonic elements arranged in array for emitting ultrasonic beams, driving means for applying a plurality of pulses having different phases each other to converging ultrasonic beams by interfering said plurality of ultrasonic beams with each other emitted from said ultrasonic generating elements of a part of said ultrasonic generating element array, which are simultaneously driven, with sequentially shifting said ultrasonic generating elements simultaneously driven to an array direction, and converging means for converging each of said plurality of ultrasonic beams in a direction of perpendicular to the array direction.Type: ApplicationFiled: October 12, 1999Publication date: April 18, 2002Inventors: SHUZO HIRAHARA, TUTOMU SAITO, HITOSHI NAGATO, TETSURO ITAKURA, SATOSHI TAKAYAMA, HIDEKI NUKADA, SHUNSUKE HATTORI, NORIKO Y. KUDO, SHIROH SAITOH, MASAMI SUGIUCHI, YOICHI TOKAI, FIMIHIKO MURAKAMI, HISAKO TANAKA, CHIAKI TANUMA, MAMORU IZUMI, ISAO AMEMIYA, ATSUKO NAKAMURA, SEIZABUROU SHIMIZU, KUMI OKUWADA
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Publication number: 20020027450Abstract: A semiconductor integrated circuit device includes a level-shifting circuit, a current mirror circuit and a switch circuit. The level-shifting circuit level-shifts an input signal having a first amplitude to an output signal having a second amplitude. The current mirror circuit charges or discharges an output node of the level-shifting circuit. The switch circuit operates the current mirror circuit during a period from the inversion of the input signal to the inversion of the output signal.Type: ApplicationFiled: September 5, 2001Publication date: March 7, 2002Inventor: Yoichi Tokai
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Patent number: 6336978Abstract: A heat regenerative material including AMz, where A is at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb; M is at least one metal selected from the group consisting of Ni and Co; and z is 0.001 to 9.0; the heat regenerative material being formed of particles with an average diameter of 1-2,000 &mgr;m or filaments with an average diameter of 1-2,000 &mgr;m.Type: GrantFiled: October 18, 1999Date of Patent: January 8, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Yoichi Tokai, Masashi Sahashi