Patents by Inventor Tomohiro Yoneyama
Tomohiro Yoneyama 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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Patent number: 11929668Abstract: In the present invention, when a DC reactor is in a magnetically saturated state, the on/off operations of a switching element are suspended and the switching element is set to an off state for a predetermined period of time, thereby resetting the magnetic saturation of the DC reactor and maintaining the supply of power to a load. After resetting the magnetic saturation, the pulse output of the normal pulse mode is restarted.Type: GrantFiled: November 8, 2019Date of Patent: March 12, 2024Assignee: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Publication number: 20240048041Abstract: A carrier wave generation unit comprising a wideband RF power supply divides a whole modulation wave variable frequency range into a plurality of modulation wave frequency sections associated with the number of PWM pulses N based on upper and lower limit frequencies of a carrier wave. In each modulation wave frequency section, an integer number of PWM pulses N associated to each modulation wave frequency section and the modulation wave frequency fs are used to vary a carrier wave frequency fc based on the relationship of fc=N·fs, thereby synchronizing the frequency between a carrier wave C and a modulation wave S to satisfy periodicity.Type: ApplicationFiled: December 17, 2021Publication date: February 8, 2024Applicant: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Tomohiro Yoneyama, Shohei Kobayashi, Yu Hosoyamada
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Patent number: 11881777Abstract: This DC-pulse power supply device is provided with: a DC power supply; a pulse unit (20) for generating a pulse output using a step-up chopper circuit connected to the DC power supply; and a voltage superimposing unit (30A, 30B) connected to a DC reactor of the step-up chopper circuit. The voltage superimposing unit (30A, 30B) superimposes an amount (Vc, VDCL2) corresponding to a superimposed voltage on the output voltage of the step-up chopper circuit. The pulse unit (20) outputs, in a pulse form, the output voltage (Vo) on which the amount (Vc, VDCL2) corresponding to the superimposed voltage is superimposed by the voltage superimposing unit (30A, 30B). The amount corresponding to the superimposed voltage is superimposed on the pulse output of the step-up chopper circuit, thereby raising the output voltage of the pulse output of the step-up chopper circuit.Type: GrantFiled: November 8, 2019Date of Patent: January 23, 2024Assignee: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Patent number: 11799373Abstract: This DC pulse power supply device includes: a DC power supply unit (10); and a pulsing unit (20) that generates a pulse output using a step-up chopper circuit connected to the DC power supply unit. A clamp voltage unit (30) has an output end that is connected to a connection point (s) between a switching element (22) and a DC reactor (21), and applies a clamp voltage (VC) to one end of the switching element (22). During an off period (Toff) of the step-up chopper circuit, the voltage at both ends of the switching element is clamped so as to prevent damage to the switching element, suppress output voltage fluctuations resulting from load current fluctuations, and suppress power loss caused by a load current and a discharge current flowing through a resistor.Type: GrantFiled: November 8, 2019Date of Patent: October 24, 2023Assignee: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Patent number: 11764666Abstract: This DC pulse power supply device comprises a voltage clamper including a capacitor that is connected in parallel to a DC reactor in a chopper circuit provided in a pulsing unit in order to suppress increases in the surge voltage resulting from the leakage inductance of the DC reactor. During the start-up of pulsing operation, which is the initial stage of the pulse mode, the frequency of the pulsing operation of the chopper circuit is controlled over the period until the capacitor voltage is charged to a sufficient voltage to reset the magnetic saturation of the DC reactor.Type: GrantFiled: November 8, 2019Date of Patent: September 19, 2023Assignee: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Patent number: 11677385Abstract: In a DC pulse power supply device according to the present invention, at the time of starting pulsing operation, the duty of the pulsing operation of a chopper circuit is controlled, a switching element is set to an ON state, and the pulse width at which the DC reactor is in an energized state is made variable over the period until the capacitor voltage is charged to a sufficient voltage to reset the magnetic saturation of the DC reactor. Gradually increasing the pulse width suppresses the degree of increase in the DC reactor current, and suppresses the DC reactor current below the magnetic saturazion level. As a result, the magnetic saturation of the DC reactor is suppressed at the time of starting pulsing operation.Type: GrantFiled: November 8, 2019Date of Patent: June 13, 2023Assignee: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Publication number: 20230080752Abstract: A full-bridge class-D amplifier circuit comprises first through fourth power devices. First conduction terminals of the first and third power devices are coupled to a first power supply voltage, and second conduction terminals of the second and fourth power devices are coupled to a second power supply voltage. A second conduction terminal of the first power device and a first conduction terminal of the second power device are coupled to a first amplifier output. A second conduction terminal of the third power device and a first conduction terminal of the fourth power device are coupled to a second amplifier output. Left and right driver devices respectively disposed adjacent to left and right sides of the first power device have outputs respectively coupled to left and right control terminals respectively disposed on the left and right sides of the first power device.Type: ApplicationFiled: September 14, 2021Publication date: March 16, 2023Inventors: Sam Seiichiro OCHI, Dumitru Gheorge SDRULLA, W. Albert GU, Tetsuya TAKATA, Itsuo YUZURIHARA, Tomohiro YONEYAMA, Yu HOSOYAMADA
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Publication number: 20230084411Abstract: A semiconductor device comprises a semiconductor die having a first region and a second region, wherein an operating temperature of the second region is lower than an operating temperature of the first region. A plurality of first tubs are respectively disposed in the first region, the second region, or both. The semiconductor device further comprises a power device comprising a plurality of power device cells, and a diode having a plurality of diode cells. The power devices cells are disposed within tubs or portions of tubs that are in the first region, and the diode cells are disposed within tubs or portions of tubs that are in the second region. The power device may comprise a vertical metal oxide semiconductor field effect transistor (MOSFET), and the diode may comprise a vertical Schottky barrier diode (SBD).Type: ApplicationFiled: September 14, 2021Publication date: March 16, 2023Inventors: Amaury GENDRON-HANSEN, Dumitru Gheorge SDRULLA, Leslie Louis SZEPESI, Tetsuya TAKATA, ltsuo YUZURIHARA, Tomohiro YONEYAMA, Yu HOSOYAMADA
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Publication number: 20220209651Abstract: This DC pulse power supply device comprises a voltage clamper including a capacitor that is connected in parallel to a DC reactor in a chopper circuit provided in a pulsing unit in order to suppress increases in the surge voltage resulting from the leakage inductance of the DC reactor. During the start-up of pulsing operation, which is the initial stage of the pulse mode, the frequency of the pulsing operation of the chopper circuit is controlled over the period until the capacitor voltage is charged to a sufficient voltage to reset the magnetic saturation of the DC reactor.Type: ApplicationFiled: November 8, 2019Publication date: June 30, 2022Applicant: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Publication number: 20220200582Abstract: In a DC pulse power supply device according to the present invention, at the time of starting pulsing operation, the duty of the pulsing operation of a chopper circuit is controlled, a switching element is set to an ON state, and the pulse width at which the DC reactor is in an energized state is made variable over the period until the capacitor voltage is charged to a sufficient voltage to reset the magnetic saturation of the DC reactor. Gradually increasing the pulse width suppresses the degree of increase in the DC reactor current, and suppresses the DC reactor current below the magnetic saturazion level. As a result, the magnetic saturation of the DC reactor is suppressed at the time of starting pulsing operation.Type: ApplicationFiled: November 8, 2019Publication date: June 23, 2022Applicant: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Patent number: 11362649Abstract: A control signal may be produced in response to an assertion of a switch signal by asserting the control signal, waiting an adaptive delay after the assertion of the switch signal, de-asserting the control signal in response to the expiration of the adaptive delay, and re-asserting the control signal in response to a current generated according to the control signal becoming zero. The adaptive delay may be adjusted according to a voltage generated using the current. A circuit may include an XOR gate producing the control signal from a switch signal and an output of a Set-Reset Flip-Flop (SRFF), a zero-detect circuit that resets the SRFF when a current generated using the control circuit becomes zero, and a delay circuit to set the SRFF an adaptive delay after assertion of the switch signal and to adjust the adaptive delay according to a voltage generated by the current.Type: GrantFiled: September 14, 2021Date of Patent: June 14, 2022Assignees: Analog Power Conversion LLC, Kyosan Electric Manufacturing Co., Ltd.Inventors: Sam Seiichiro Ochi, Tetsuya Takata, Itsuo Yuzurihara, Tomohiro Yoneyama, Yu Hosoyamada
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Publication number: 20220149719Abstract: In the present invention, when a DC reactor is in a magnetically saturated state, the on/off operations of a switching element are suspended and the switching element is set to an off state for a predetermined period of time, thereby resetting the magnetic saturation of the DC reactor and maintaining the supply of power to a load. After resetting the magnetic saturation, the pulse output of the normal pulse mode is restarted.Type: ApplicationFiled: November 8, 2019Publication date: May 12, 2022Applicant: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Publication number: 20220094266Abstract: This DC-pulse power supply device is provided with: a DC power supply; a pulse unit (20) for generating a pulse output using a step-up chopper circuit connected to the DC power supply; and a voltage superimposing unit (30A, 30B) connected to a DC reactor of the step-up chopper circuit. The voltage superimposing unit (30A, 30B) superimposes an amount (Vc, VDCL2) corresponding to a superimposed voltage on the output voltage of the step-up chopper circuit. The pulse unit (20) outputs, in a pulse form, the output voltage (Vo) on which the amount (Vc, VDCL2) corresponding to the superimposed voltage is superimposed by the voltage superimposing unit (30A, 30B). The amount corresponding to the superimposed voltage is superimposed on the pulse output of the step-up chopper circuit, thereby raising the output voltage of the pulse output of the step-up chopper circuit.Type: ApplicationFiled: November 8, 2019Publication date: March 24, 2022Applicant: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Publication number: 20220094269Abstract: A DC pulse power supply device (1) includes: a DC power supply (10); a pulsing unit (20A) that generates a pulse output using a step-up chopper circuit connected to the DC power supply; and a regeneration unit (30). The regeneration unit regenerates, to the DC power supply, the voltage component among a reactor voltage (VDCL) of a DC reactor (21A) in the step-up chopper circuit exceeding a set voltage. Thus, the voltage of the step-up chopper circuit is clamped to a prescribed voltage to suppress excessive voltage increases. Moreover, resistor energy consumption is eliminated and the efficiency of supplying power to a load is boosted by regeneration to the DC power supply.Type: ApplicationFiled: November 8, 2019Publication date: March 24, 2022Applicant: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Publication number: 20220094261Abstract: This DC pulse power supply device includes: a DC power supply unit (10); and a pulsing unit (20) that generates a pulse output using a step-up chopper circuit connected to the DC power supply unit. A clamp voltage unit (30) has an output end that is connected to a connection point (s) between a switching element (22) and a DC reactor (21), and applies a clamp voltage (VC) to one end of the switching element (22). During an off period (Toff) of the step-up chopper circuit, the voltage at both ends of the switching element is clamped so as to prevent damage to the switching element, suppress output voltage fluctuations resulting from load current fluctuations, and suppress power loss caused by a load current and a discharge current flowing through a resistor.Type: ApplicationFiled: November 8, 2019Publication date: March 24, 2022Applicant: KYOSAN ELECTRIC MFG. CO., LTD.Inventors: Itsuo Yuzurihara, Toshiyuki Adachi, Tomohiro Yoneyama, Koichi Miyazaki
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Patent number: 7206723Abstract: A method of assisting a wiring design of a wiring structure includes the steps of: regarding the wiring structure constituted by a plurality of pieces of line streak members as an elastic body which has a circular section and in which a plurality of beam elements a linearity of which is maintained are coupled with each other; applying information concerning a shape characteristic, a material characteristic and a constraining condition of the wiring structure as a predetermined condition to a finite element method; calculating a predicted shape of the forcibly displaced wiring structure such that the predetermined condition is satisfied; and outputting the calculated predicted shape.Type: GrantFiled: September 25, 2003Date of Patent: April 17, 2007Assignee: Yazaki CorporationInventors: Masayoshi Sawai, Tomohiro Yoneyama, Akiko Nakano
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Publication number: 20040130878Abstract: A method of assisting a wiring design of a wiring structure includes the steps of: regarding the wiring structure constituted by a plurality of pieces of line streak members as an elastic body which has a circular section and in which a plurality of beam elements a linearity of which is maintained are coupled with each other; applying information concerning a shape characteristic, a material characteristic and a constraining condition of the wiring structure as a predetermined condition to a finite element method; calculating a predicted shape of the forcibly displaced wiring structure such that the predetermined condition is satisfied; and outputting the calculated predicted shape.Type: ApplicationFiled: September 25, 2003Publication date: July 8, 2004Applicant: YAZAKI CORPORATIONInventors: Masayoshi Sawai, Tomohiro Yoneyama, Akiko Nakano