Patents by Inventor Retsu SUGAWARA
Retsu SUGAWARA 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: 11979182Abstract: A noise elimination device includes a noise elimination unit to generate a noise-eliminated spectrum by performing noise elimination on the basis of symmetry of noise superimposed on a reception signal spectrum.Type: GrantFiled: May 13, 2020Date of Patent: May 7, 2024Assignee: Mitsubishi Electric CorporationInventors: Retsu Sugawara, Jun Takahashi, Yuji Matsuda
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Patent number: 11749439Abstract: A common mode choke coil includes: a magnetic core; and a pair of coils wound on a winding portion of the magnetic core, wherein the pair of coils include a first pole coil and a second pole coil which are each wound on the winding portion in a spiral shape by N turns, and wherein the first pole coil and the second pole coil are arranged on the winding portion so that one or more turns of the N turns are adjacent to each other, and each include a parallel running portion and a non-parallel running portion, the first pole coil and the second pole coil overlapping each other in the parallel running portion, and separating from each other in the non-parallel running portion in at least one turn of the adjacent first pole coil and second pole coil as viewed from the length direction of the winding portion.Type: GrantFiled: July 17, 2019Date of Patent: September 5, 2023Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Retsu Sugawara, Kazutoshi Awane, Yudai Yoneoka
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Publication number: 20230126042Abstract: A noise elimination device includes a noise elimination unit to generate a noise-eliminated spectrum by performing noise elimination on the basis of symmetry of noise superimposed on a reception signal spectrum.Type: ApplicationFiled: May 13, 2020Publication date: April 27, 2023Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Retsu SUGAWARA, Jun TAKAHASHI, Yuji MATSUDA
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Publication number: 20220069701Abstract: A controller is provided for generating carrier signals for a PWM generator controlling an inverter driving an electric actuator to reduce the EMI level of the inverter. The controller includes an interface configured to connect to the inverter, a memory configured to store a measured electromagnetic-interference (EMI) spectrum, a desired EMI spectrum and an EMI suppression rate program, and a processor. The processor is, in connection with the memory, configured to computing EMI suppression rates for a frequency range, wherein the EMI suppression determined adaptively by the measured EMI spectrum and the desired EMI spectrum, computing sweep duration of discrete frequency, wherein the sweep duration is determined by the EMI suppression rate of the discrete frequency, and a modulator configured to modulate the carrier signals based on the sweep durations of carrier frequencies and to transmit the modulated carrier signals to the PWM generator to generate PWM signals for the inverter.Type: ApplicationFiled: September 29, 2020Publication date: March 3, 2022Applicants: Mitsubishi Electric CorporationInventors: Dehong Liu, Retsu Sugawara, Philip Orlik
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Patent number: 11258357Abstract: A controller is provided for generating carrier signals for a PWM generator controlling an inverter driving an electric actuator to reduce the EMI level of the inverter. The controller includes an interface configured to connect to the inverter, a memory configured to store a measured electromagnetic-interference (EMI) spectrum, a desired EMI spectrum and an EMI suppression rate program, and a processor. The processor is, in connection with the memory, configured to computing EMI suppression rates for a frequency range, wherein the EMI suppression determined adaptively by the measured EMI spectrum and the desired EMI spectrum, computing sweep duration of discrete frequency, wherein the sweep duration is determined by the EMI suppression rate of the discrete frequency, and a modulator configured to modulate the carrier signals based on the sweep durations of carrier frequencies and to transmit the modulated carrier signals to the PWM generator to generate PWM signals for the inverter.Type: GrantFiled: September 29, 2020Date of Patent: February 22, 2022Assignees: Mitsubishi Electric Research Laboratories, Inc., Mitsubishi Electric CorporationInventors: Dehong Liu, Retsu Sugawara, Philip Orlik
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Publication number: 20210327629Abstract: A common mode choke coil includes: a magnetic core; and a pair of coils wound on a winding portion of the magnetic core, wherein the pair of coils include a first pole coil and a second pole coil which are each wound on the winding portion in a spiral shape by N turns, and wherein the first pole coil and the second pole coil are arranged on the winding portion so that one or more turns of the N turns are adjacent to each other, and each include a parallel running portion and a non-parallel running portion, the first pole coil and the second pole coil overlapping each other in the parallel running portion, and separating from each other in the non-parallel running portion in at least one turn of the adjacent first pole coil and second pole coil as viewed from the length direction of the winding portion.Type: ApplicationFiled: January 17, 2019Publication date: October 21, 2021Applicant: Mitsubishi Electric CorporationInventors: Retsu SUGAWARA, Kazutoshi AWANE, Yudai YONEOKA
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Patent number: 10804814Abstract: A capacitor has a parasitic inductance component and is electrically connected between a positive line and a negative line. A converter includes a reactor provided in the positive line and performs voltage conversion of a DC voltage smoothed by a capacitor. An inverter performs DC-AC conversion between the converter and an AC motor by switching control. A path of the positive line which connects a DC power supply and the capacitor has an inductance smaller than an inductance of a path of the negative line which connects the DC power supply and the capacitor. A difference between the inductance of the path and the inductance of the path is less than twice the parasitic inductance component.Type: GrantFiled: February 16, 2018Date of Patent: October 13, 2020Assignee: MITSUBISHI ELECTRIC CORPORATIONInventors: Retsu Sugawara, Kazutoshi Awane
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Publication number: 20200099314Abstract: A capacitor has a parasitic inductance component and is electrically connected between a positive line and a negative line. A converter includes a reactor provided in the positive line and performs voltage conversion of a DC voltage smoothed by a capacitor. An inverter performs DC-AC conversion between the converter and an AC motor by switching control. A path of the positive line which connects a DC power supply and the capacitor has an inductance smaller than an inductance of a path of the negative line which connects the DC power supply and the capacitor. A difference between the inductance of the path and the inductance of the path is less than twice the parasitic inductance component.Type: ApplicationFiled: February 16, 2018Publication date: March 26, 2020Applicant: Mitsubishi Electric CorporationInventors: Retsu SUGAWARA, Kazutoshi AWANE