Patents by Inventor Hiroshi Maruyama

Hiroshi Maruyama 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: 11521960
    Abstract: A terminal protection circuit of a semiconductor chip, including a first pad serving as a ground terminal of the semiconductor chip, a ground line extending along an outer periphery of the semiconductor chip and being connected to the first pad, and an overcurrent sensing circuit. The overcurrent sensing circuit has a second pad, a threshold voltage generating circuit, a comparator having inverting and non-inverting input terminals respectively connected to the threshold voltage generating circuit and the second pad, the comparator comparing a current detection signal and a threshold voltage received respectively at the non-inverting and inverting input terminals, a first input protection element connected between the second pad and a first position on the chip-peripheral ground line, and a potential shift element connected between the inverting input terminal of the comparator and the first position, for shifting the threshold voltage thereat according to a potential at the first position.
    Type: Grant
    Filed: November 25, 2020
    Date of Patent: December 6, 2022
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Hiroshi Maruyama
  • Publication number: 20220342540
    Abstract: A touch panel system includes a touch panel including a drive electrode, a position detection electrode, and a pressing detection electrode, and a controller configured to impart a drive signal to the drive electrode and acquire signal values from each of the position detection electrode and the pressing detection electrode. The controller detects a position of an indicator on the basis of the signal values obtained from the position detection electrode and calculates a magnitude of pressing of the indicator on the basis of signal values in a pressing detection range corresponding to the detected position of the indicator among the signal values obtained from the pressing detection electrode.
    Type: Application
    Filed: April 15, 2022
    Publication date: October 27, 2022
    Inventors: Takenori Maruyama, Kazutoshi Kida, Shinji Yamagishi, Takuma Yamamoto, Yasuhiro Sugita, Hiroshi Fukushima
  • Publication number: 20220329564
    Abstract: Conventional security measures are generally intended for an IT system, and it has been difficult to satisfy a real-time property and availability requested to a control system. Furthermore, since a time-division type time slot communication method is not taken into consideration, such time slot communication has problems in efficient utilization of computer resources and decrease in availability. In order to solve the above-described problems, the present invention specifies a time slot from characteristics of a communication packet received by a reception unit 133 by using a time slot characteristic storage unit 130, and selects, in accordance with the specified time slot, an inspection pattern stored in an inspection pattern storage unit 136 by using an inspection pattern selection unit 131.
    Type: Application
    Filed: June 23, 2020
    Publication date: October 13, 2022
    Applicant: Hitachi, Ltd.
    Inventors: Tatsuya MARUYAMA, Noritaka MATSUMOTO, Hiroshi IWASAWA, Hiromichi ENDOH, Junya FUJITA
  • Publication number: 20220329249
    Abstract: An R/D conversion method includes a step of removing a frequency band including a frequency component that is twice an excitation frequency of excitation signals of a resolver (30) from a digital angle value (?). The R/D conversion method further includes a step of outputting, by the resolver (30), the resolver signals having a phase difference that corresponds to an angle of the resolver with respect to the excitation signals, respectively, and a step of feeding back the digital angle value (?) includes feeding back the digital angle value (?) to the resolver signals.
    Type: Application
    Filed: September 10, 2020
    Publication date: October 13, 2022
    Inventors: Hiroshi KUSHIHARA, Hirofumi MARUYAMA, Ryohei USHIKUSA, Shinichi ARAI
  • Patent number: 11411499
    Abstract: A power supply circuit includes an inductor, a power transistor configured to control an inductor current flowing through the inductor, and an integrated circuit driving the power transistor. The integrated circuit includes a first terminal that receives a power supply voltage for operating the integrated circuit, generated according to a variation in the inductor current, a second terminal to which a control electrode of the power transistor is coupled, a first drive circuit configured to drive the power transistor via the second terminal during a first time period to turn on the power transistor, and a second drive circuit configured to drive the power transistor via the second terminal during a second time period to turn on the power transistor, the second time period including at least a part of the first time period, driving capability of the second drive circuit being lower than that of the first drive circuit.
    Type: Grant
    Filed: May 24, 2021
    Date of Patent: August 9, 2022
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventors: Hiroshi Maruyama, Takato Sugawara
  • Publication number: 20220166309
    Abstract: A signal output circuit including a first transistor coupled to a power supply line to receive a power supply voltage, a diode provided between the power supply line and a gate electrode of the first transistor, and a current generation circuit provided on a ground side with respect to the diode, the current generation circuit being configured to generate a current for the diode, upon turning on of the first transistor, and to increase the current, upon the power supply voltage dropping below a predetermined level.
    Type: Application
    Filed: August 27, 2021
    Publication date: May 26, 2022
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Hiroshi MARUYAMA, Takato SUGAWARA
  • Publication number: 20220151529
    Abstract: The purpose of the present invention is to provide a biological information measurement garment that reduces the wear discomfort. The garment includes a clothing fabric; and an electrode formed on a skin-side surface of the clothing fabric, the clothing fabric having, in the skin-side surface thereof, an area of 30 cm2 or more that is not covered with the electrode and is exposed, the electrode including a conductive member, and a heat capacity A (J/K) of the conductive member and a heat capacity B (J/K) of the clothing fabric satisfying a following formula (1).
    Type: Application
    Filed: March 30, 2020
    Publication date: May 19, 2022
    Applicants: TOYOBO CO., LTD., TOYOBO STC CO., LTD.
    Inventors: Yusuke SHIMIZU, Euichul KWON, Shota MORIMOTO, Yoko KOMATSU, Hiroshi MARUYAMA
  • Patent number: 11336170
    Abstract: Provided is a power supply device comprising a voltage conversion portion configured to convert input voltage to output voltage by pulse width modulation, a frequency reduction circuit configured to reduce a frequency of the pulse width modulation in response to detection of an overload during normal operation of the voltage conversion portion and startup of the voltage conversion portion, and a frequency setting circuit configured to set the frequency of the pulse width modulation used when starting up the voltage conversion portion to a frequency higher than a minimum frequency corresponding to the overload. In addition, provided is a power supply control device and a power supply control method relating to the power supply device.
    Type: Grant
    Filed: February 24, 2020
    Date of Patent: May 17, 2022
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Hiroshi Maruyama
  • Publication number: 20220038009
    Abstract: A power supply circuit includes an inductor, a power transistor configured to control an inductor current flowing through the inductor, and an integrated circuit driving the power transistor. The integrated circuit includes a first terminal that receives a power supply voltage for operating the integrated circuit, generated according to a variation in the inductor current, a second terminal to which a control electrode of the power transistor is coupled, a first drive circuit configured to drive the power transistor via the second terminal during a first time period to turn on the power transistor, and a second drive circuit configured to drive the power transistor via the second terminal during a second time period to turn on the power transistor, the second time period including at least a part of the first time period, driving capability of the second drive circuit being lower than that of the first drive circuit.
    Type: Application
    Filed: May 24, 2021
    Publication date: February 3, 2022
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventors: Hiroshi Maruyama, Takato Sugawara
  • Patent number: 11168790
    Abstract: A sliding member having a hard carbon coating that has a thickness of 3 ?m or more and demonstrates high peeling resistance and high wear resistance is provided. A sliding member 100 according to the present disclosure includes a base member 10 and a hard carbon coating 12 that is formed on the base member 10 and has the hydrogen content of 3 atomic % or less and a thickness of 3 ?m or more. When HM represents a Martens hardness of the hard carbon coating 12 and HIT represents an indentation hardness, the ratio HM/HIT is 0.40 or more.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: November 9, 2021
    Assignee: KABUSHIKI KAISHA RIKEN
    Inventors: Kazuya Kameda, Yuuichi Ishida, Hiroshi Maruyama, Takuma Sekiya
  • Publication number: 20210225833
    Abstract: A terminal protection circuit of a semiconductor chip, including a first pad serving as a ground terminal of the semiconductor chip, a ground line extending along an outer periphery of the semiconductor chip and being connected to the first pad, and an overcurrent sensing circuit. The overcurrent sensing circuit has a second pad, a threshold voltage generating circuit, a comparator having inverting and non-inverting input terminals respectively connected to the threshold voltage generating circuit and the second pad, the comparator comparing a current detection signal and a threshold voltage received respectively at the non-inverting and inverting input terminals, a first input protection element connected between the second pad and a first position on the chip-peripheral ground line, and a potential shift element connected between the inverting input terminal of the comparator and the first position, for shifting the threshold voltage thereat according to a potential at the first position.
    Type: Application
    Filed: November 25, 2020
    Publication date: July 22, 2021
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventor: Hiroshi MARUYAMA
  • Publication number: 20200284346
    Abstract: A sliding member having a hard carbon coating that has a thickness of 3 ?m or more and demonstrates high peeling resistance and high wear resistance is provided. A sliding member 100 according to the present disclosure includes a base member 10 and a hard carbon coating 12 that is formed on the base member 10 and has the hydrogen content of 3 atomic % or less and a thickness of 3 ?m or more. When HM represents a Martens hardness of the hard carbon coating 12 and HIT represents an indentation hardness, the ratio HM/HIT is 0.40 or more.
    Type: Application
    Filed: October 9, 2018
    Publication date: September 10, 2020
    Applicant: KABUSHIKI KAISHA RIKEN
    Inventors: Kazuya KAMEDA, Yuuichi ISHIDA, Hiroshi MARUYAMA, Takuma SEKIYA
  • Publication number: 20200195128
    Abstract: Provided is a power supply device comprising a voltage conversion portion configured to convert input voltage to output voltage by pulse width modulation, a frequency reduction circuit configured to reduce a frequency of the pulse width modulation in response to detection of an overload during normal operation of the voltage conversion portion and startup of the voltage conversion portion, and a frequency setting circuit configured to set the frequency of the pulse width modulation used when starting up the voltage conversion portion to a frequency higher than a minimum frequency corresponding to the overload. In addition, provided is a power supply control device and a power supply control method relating to the power supply device.
    Type: Application
    Filed: February 24, 2020
    Publication date: June 18, 2020
    Inventor: Hiroshi MARUYAMA
  • Patent number: 10670147
    Abstract: Provided is a sliding member having a hard carbon coating that makes high wear resistance compatible with a low coefficient of friction and that has excellent peeling resistance. A sliding member (100) includes a base member (10) and a hard carbon coating (12) formed on the base member (10). The indentation hardness of the hard carbon coating (12) decreases gradually from the base member side to the surface side. The hard carbon coating (12) has an indentation hardness distribution at 0?T/Ttotal?0.6 approximated by a first line and an indentation hardness distribution at 0.9?T/Ttotal?1 approximated by a second line, and the intersection between the first line and the second line (T2/Ttotal, H2) satisfies Expression (1), (H3?H1)×T2/Ttotal+H1<H2?0.9×H1, and Expression (2), 0.6?T2/Ttotal?0.9.
    Type: Grant
    Filed: October 24, 2018
    Date of Patent: June 2, 2020
    Assignee: KABUSHIKI KAISHA RIKEN
    Inventors: Kazuya Kameda, Hiroshi Maruyama, Yuuichi Ishida, Takuma Sekiya
  • Publication number: 20200056700
    Abstract: Provided is a sliding member having a hard carbon coating that makes high wear resistance compatible with a low coefficient of friction and that has excellent peeling resistance. A sliding member (100) includes a base member (10) and a hard carbon coating (12) formed on the base member (10). The indentation hardness of the hard carbon coating (12) decreases gradually from the base member side to the surface side. The hard carbon coating (12) has an indentation hardness distribution at 0?T/Ttotal?0.6 approximated by a first line and an indentation hardness distribution at 0.9?T/Ttotal?1 approximated by a second line, and the intersection between the first line and the second line (T2/Ttotal, H2) satisfies Expression (1), (H3?H1)×T2/Ttotal+H1<H2?0.9×H1, and Expression (2), 0.6?T2/Ttotal?0.9.
    Type: Application
    Filed: October 24, 2018
    Publication date: February 20, 2020
    Applicant: KABUSHIKI KAISHA RIKEN
    Inventors: Kazuya KAMEDA, Hiroshi MARUYAMA, Yuuichi ISHIDA, Takuma SEKIYA
  • Patent number: 10461649
    Abstract: A switched-mode power supply circuit that performs a burst-mode operation to stop and restart switching is provided, including: a power supply that supplies DC voltage; a switching element that controls the switching; a first comparator that detects an output voltage of the switched-mode power supply circuit; a storage element that stores an output of the first comparator according to a timing of controlling the switching; and a determination unit that measures a time period for which at least one of an output of the first comparator or an output of the storage element continues to be higher than the predetermined voltage, and if the measurement is not reset within a predetermined elapsed time, determines that the switched-mode power supply circuit is in an overvoltage state, wherein the switched-mode power supply circuit resets the measurement at a timing corresponding to a switching stop timing in the burst-mode operation.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: October 29, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Hiroshi Maruyama
  • Publication number: 20190115841
    Abstract: A switched-mode power supply circuit that performs a burst-mode operation to stop and restart switching is provided, including: a power supply that supplies DC voltage; a switching element that controls the switching; a first comparator that detects an output voltage of the switched-mode power supply circuit; a storage element that stores an output of the first comparator according to a timing of controlling the switching; and a determination unit that measures a time period for which at least one of an output of the first comparator or an output of the storage element continues to be higher than the predetermined voltage, and if the measurement is not reset within a predetermined elapsed time, determines that the switched-mode power supply circuit is in an overvoltage state, wherein the switched-mode power supply circuit resets the measurement at a timing corresponding to a switching stop timing in the burst-mode operation.
    Type: Application
    Filed: August 28, 2018
    Publication date: April 18, 2019
    Inventor: Hiroshi MARUYAMA
  • Publication number: 20180367029
    Abstract: A switching power supply device includes a power factor correction (PFC) circuit, a DC-DC converter, and a control IC incorporating functions of controlling these components. At power up, a capacitor connected to a terminal VCC is charged with a current whose voltage has been adjusted by a starting circuit. When a voltage across the capacitor reaches a UVLO cancelation voltage, an under-voltage lockout (UVLO) circuit outputs a first enable signal, thereby driving a PFC control circuit. When the PFC control circuit outputs a PFC switching signal, a PFC switching detection circuit outputs a second enable signal, thereby driving an LLC control circuit. Since the time between the start of the PFC switching operation and the start of the operation of the LLC control circuit is shortest, there is no need to supplement the starting power and arrange an auxiliary winding for an inductor.
    Type: Application
    Filed: April 27, 2018
    Publication date: December 20, 2018
    Applicant: FUJI ELECTRIC CO., LTD.
    Inventor: Hiroshi MARUYAMA
  • Patent number: 10158282
    Abstract: A switching power supply device includes a power factor correction (PFC) circuit, a DC-DC converter, and a control IC incorporating functions of controlling these components. At power up, a capacitor connected to a terminal VCC is charged with a current whose voltage has been adjusted by a starting circuit. When a voltage across the capacitor reaches a UVLO cancelation voltage, an under-voltage lockout (UVLO) circuit outputs a first enable signal, thereby driving a PFC control circuit. When the PFC control circuit outputs a PFC switching signal, a PFC switching detection circuit outputs a second enable signal, thereby driving an LLC control circuit. Since the time between the start of the PFC switching operation and the start of the operation of the LLC control circuit is shortest, there is no need to supplement the starting power and arrange an auxiliary winding for an inductor.
    Type: Grant
    Filed: April 27, 2018
    Date of Patent: December 18, 2018
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Hiroshi Maruyama
  • Patent number: 9859788
    Abstract: When a standby signal is High, a Comp_stb signal that is overlapped with an AC waveform is output from an AC-COMP combining circuit in a COMP signal changing circuit, input into a PWM.comp, and compared with an output waveform of a ramp oscillator. Here, only when a peak of the Comp_stb signal is higher than a minimum voltage of the ramp oscillator is an OUT terminal output signal output from a control IC and a burst operation is performed. When the Comp_stb signal is lower than the minimum voltage of the ramp oscillator, the OUT terminal output signal is not output from the control IC because a reset signal of an RSFF remains High. Accordingly, a switching loss is reduced by operating a switching element in a burst mode when a switching power supply apparatus is in a lightly loaded or unloaded state.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: January 2, 2018
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Hiroshi Maruyama