Patents by Inventor Yoshiyuki Tabata
Yoshiyuki Tabata 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: 10239144Abstract: The welding device of the present disclosure has a switching section, a setting section, an output detector, a controller, a frequency controller, and a driver. The switching section is formed of a switching element. The setting section determines setting output. The output detector detects welding output. The controller calculates an output-on period of the switching section according to the setting output and the welding output. The frequency controller determines an inverter frequency based on the output-on period. The driver controls on/off operation of a switching element of the switching section based on the inverter frequency and the output-on period. When the output-on period is calculated using a first ratio, the inverter frequency is determined to a first frequency, and when the output-on period is calculated using a second ratio smaller than the first ratio, the inverter frequency is determined to a second frequency higher than the first frequency.Type: GrantFiled: July 7, 2014Date of Patent: March 26, 2019Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Yoshiaki Tanaka, Yoshiyuki Tabata, Shinsuke Shimabayashi
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Publication number: 20160144442Abstract: The welding device of the present disclosure has a switching section, a setting section, an output detector, a controller, a frequency controller, and a driver. The switching section is formed of a switching element. The setting section determines setting output. The output detector detects welding output. The controller calculates an output-on period of the switching section according to the setting output and the welding output. The frequency controller determines an inverter frequency based on the output-on period. The driver controls on/off operation of a switching element of the switching section based on the inverter frequency and the output-on period. When the output-on period is calculated using a first ratio, the inverter frequency is determined to a first frequency, and when the output-on period is calculated using a second ratio smaller than the first ratio, the inverter frequency is determined to a second frequency higher than the first frequency.Type: ApplicationFiled: July 7, 2014Publication date: May 26, 2016Inventors: YOSHIAKI TANAKA, YOSHIYUKI TABATA, SHINSUKE SHIMABAYASHI
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Patent number: 9162307Abstract: If arc interruption occurs during AC arc welding, a first AC frequency predetermined for normal welding is switched to a second AC frequency higher than the first AC frequency. This allows the arc to be reignited without applying a high frequency high voltage, thereby preventing the damage of the surface of the weld bead or communication failure due to the high frequency high voltage.Type: GrantFiled: February 15, 2011Date of Patent: October 20, 2015Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Yoshiaki Tanaka, Masafumi Naruto, Yoshiyuki Tabata, Norikazu Oosaki
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Patent number: 8564972Abstract: An inverter control device drives one of the two switching circuits with a fixed conduction width and changes the control method of the other switching circuit between pulse-width modulation, phase control method, and drive signal width control method by phase control method according to an output state, to implement highly accurate control at low output while suppressing heat generation of a switching element.Type: GrantFiled: May 24, 2010Date of Patent: October 22, 2013Assignee: Panasonic CorporationInventors: Norikazu Ohsaki, Yoshiaki Tanaka, Yoshiyuki Tabata
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Publication number: 20120118866Abstract: If arc interruption occurs during AC arc welding, a first AC frequency predetermined for normal welding is switched to a second AC frequency higher than the first AC frequency. This allows the arc to be reignited without applying a high frequency high voltage, thereby preventing the damage of the surface of the weld bead or communication failure due to the high frequency high voltage.Type: ApplicationFiled: February 15, 2011Publication date: May 17, 2012Applicant: Panasonic CorporationInventors: Yoshiaki Tanaka, Masafumi Naruto, Yoshiyuki Tabata, Norikazu Oosaki
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Publication number: 20120120687Abstract: An inverter control device drives one of the two switching circuits with a fixed conduction width and changes the control method of the other switching circuit between pulse-width modulation, phase control method, and drive signal width control method by phase control method according to an output state, to implement highly accurate control at low output while suppressing heat generation of a switching element.Type: ApplicationFiled: May 24, 2010Publication date: May 17, 2012Applicant: Panasonic CorporationInventors: Norikazu Ohsaki, Yoshiaki Tanaka, Yoshiyuki Tabata
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Publication number: 20070034617Abstract: In the conventional arc welding control unit, since the air of the outside of the equipment is applied directly to the whole of the main semiconductor for cooling, there is found a problem that dust, welding fumes and the like can accumulate on or adhere to the conductive portions of the inside of the equipment, which takes time for maintenance of the equipment. To solve this, according to the invention, there is provided an arc welding control unit having a heat radiating unit built in the box body thereof for discharging the air heated by a heat generating first electrical element to the outside. The heat radiating unit has a tunnel-type shape including an outer peripheral portion for defining a cavity portion allowing the air to flow therethrough, whereby dust, welding fumes and the like can be prevented from accumulating on or adhering to the conductive portions of the inside of the equipment.Type: ApplicationFiled: June 21, 2005Publication date: February 15, 2007Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Hidetoshi Oyama, Yoshiyuki Tabata, Yasumichi Muto, Yasushi Mukai
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Patent number: 6555785Abstract: A welding condition inputting equipment capable of setting the welding conditions such as welding current and welding voltage easily and securely is disclosed. The welding condition inputting equipment comprises an operating section for inputting the welding conditions, a determining section for selecting items, and a display section for displaying selected items. When the welding conditions are input, the operating section outputs the conditions to the determining section. When the conditions are input in the determining section, the determining section selects items relating to welding corresponding to the conditions, and outputs the items to the display section. When the items are input in the display section, the display section displays the items. The operating section specifically includes a dial, a switch, and a push-in dial switch integrally combining a dial rotation detecting part.Type: GrantFiled: April 10, 2001Date of Patent: April 29, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Atsuhiro Kawamoto, Akihiko Kitajima, Norikazu Osaki, Kunio Kubo, Koji Hamamoto, Shigeki Yonemori, Yoshiyuki Tabata
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Publication number: 20020023721Abstract: A welding condition inputting equipment capable of setting the welding conditions such as welding current and welding voltage easily and securely is disclosed. The welding condition inputting equipment comprises an operating section for inputting the welding conditions, a determining section for selecting items, and a display section for displaying selected items. When the welding conditions are input, the operating section outputs the conditions to the determining section. When the conditions are input in the determining section, the determining section selects items relating to welding corresponding to the conditions, and outputs the items to the display section. When the items are input in the display section, the display section displays the items. The operating section specifically includes a dial, a switch, and a push-in dial switch integrally combining a dial rotation detecting part.Type: ApplicationFiled: April 10, 2001Publication date: February 28, 2002Inventors: Atsuhiro Kawamoto, Akihiko Kitajima, Norikazu Osaki, Kunio Kubo, Koji Hamamoto, Shigeki Yonemori, Yoshiyuki Tabata
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Patent number: 5963590Abstract: A framing and voice decoder part outputs an error information. An error ratio monitoring part monitors a bit error ratio based on the error information. A sampling rate changing part decides a sampling rate based on the bit error ratio and changes a number of bits of each shift register in the differential detector part to adapt the sampling rate. A sampling clock selector part selects one clock signal among four different frequency clock signals based on the decision of the sampling rate changing part and gives selected clock signal to the differential detector part as a sampling clock. The differential detector part makes demodulation in DQPSK (Differential Quadrilateral Phase Shift Keying). Since the error ratio is always maintained within a predetermined extent, a good voice quality is obtained. Since the sampling rate will not increase to unnecessarily high levels, power saving can be achieved and a consumption of batteries is reduced.Type: GrantFiled: November 28, 1994Date of Patent: October 5, 1999Assignee: Murata Mfg. Co., Ltd.Inventors: Kazuyoshi Nakaya, Yoshiyuki Tabata
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Patent number: 5956376Abstract: A framing and voice decoder part outputs an error information. An error ratio monitoring part monitors a bit error ratio based on the error information. A sampling rate changing part decides a sampling rate based on the bit error ratio and changes a number of bits of each shift register in the differential detector part to adapt the sampling rate. A sampling clock selector part selects one clock signal among four different frequency clock signals based on the decision of the sampling rate changing part and gives selected clock signal to the differential detector part as a sampling clock. The differential detector part makes demodulation in DQPSK (Differential Quadrilateral Phase Shift Keying). Since the error ratio is always maintained within a predetermined extent, a good voice quality is obtained. Since the sampling rate will not increase to unnecessarily high levels, power saving can be achieved and a consumption of batteries is reduced.Type: GrantFiled: December 30, 1996Date of Patent: September 21, 1999Assignee: Murata Mfg. Co., Ltd.Inventors: Kazuyoshi Nakaya, Yoshiyuki Tabata
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Patent number: D445812Type: GrantFiled: October 2, 2000Date of Patent: July 31, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masaki Shimizu, Akihiko Kitajima, Norikazu Osaki, Koji Hamamoto, Yoshiyuki Tabata, Tsutomu Naito