Patents by Inventor Masaki Asari
Masaki Asari 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: 9941728Abstract: A battery charging device provided with: a bridge-type controlled rectifier circuit having three-phase thyristors for rectifying the output of a three-phase AC generator and supplying a charging current to a battery; and a controller for controlling the supplying of a trigger signal to the thyristors in accordance with the terminal voltage of the battery; the controller being configured so that the trigger signal is supplied to the thyristors simultaneously when it is detected that the terminal voltage of the battery is equal to or lower than a set voltage, and supplying of the trigger signal is stopped when a certain period has elapsed after the terminal voltage exceeds the set voltage, in order to prevent commutation failure of the thyristors when charging of the battery is stopped, and prevent overcharging of the battery.Type: GrantFiled: October 20, 2015Date of Patent: April 10, 2018Assignee: KOKUSAN DENKI CO., LTD.Inventors: Nozomu Katsumata, Shuichi Muramatsu, Masaki Asari, Tomoya Tamakawa, Akinari Ueki
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Publication number: 20160118831Abstract: A battery charging device provided with: a bridge-type controlled rectifier circuit having three-phase thyristors for rectifying the output of a three-phase AC generator and supplying a charging current to a battery; and a controller for controlling the supplying of a trigger signal to the thyristors in accordance with the terminal voltage of the battery; the controller being configured so that the trigger signal is supplied to the thyristors simultaneously when it is detected that the terminal voltage of the battery is equal to or lower than a set voltage, and supplying of the trigger signal is stopped when a certain period has elapsed after the terminal voltage exceeds the set voltage, in order to prevent commutation failure of the thyristors when charging of the battery is stopped, and prevent overcharging of the battery.Type: ApplicationFiled: October 20, 2015Publication date: April 28, 2016Inventors: NOZOMU KATSUMATA, SHUICHI MURAMATSU, MASAKI ASARI, TOMOYA TAMAKAWA, AKINARI UEKI
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Patent number: 8736233Abstract: A power source device for rectifying the output of an AC generator in which magneto coils are in a star-shaped connection in three phases. The device includes a control rectifier circuit configured from a first control rectifier circuit for performing full-wave rectification on three-phase AC voltages, and a second control rectifier circuit for performing full-wave rectification on AC voltages obtained between neutral and each of two-phase AC output terminals selected from the three-phase AC output terminals of the generator, as well as on AC voltage obtained between the selected two-phase AC output terminals; and a controller controlling the first and second circuits so that the output of the first circuit is supplied to the load when the rotational speed of the generator is equal/less than a set speed, and the output of the second circuit is supplied to the load when the rotational speed exceeds the set speed.Type: GrantFiled: August 24, 2012Date of Patent: May 27, 2014Assignee: Kokusan Denki Co., Ltd.Inventors: Shuichi Muramatsu, Ryosuke Tonooka, Shinji Komatsu, Nozomu Katsumata, Masaki Asari, Hirofumi Yamaguchi
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Publication number: 20130051097Abstract: A power source device for rectifying the output of an AC generator in which magneto coils are in a star-shaped connection in three phases. The device includes a control rectifier circuit configured from a first control rectifier circuit for performing full-wave rectification on three-phase AC voltages, and a second control rectifier circuit for performing full-wave rectification on AC voltages obtained between neutral and each of two-phase AC output terminals selected from the three-phase AC output terminals of the generator, as well as on AC voltage obtained between the selected two-phase AC output terminals; and a controller controlling the first and second circuits so that the output of the first circuit is supplied to the load when the rotational speed of the generator is equal/less than a set speed, and the output of the second circuit is supplied to the load when the rotational speed exceeds the set speed.Type: ApplicationFiled: August 24, 2012Publication date: February 28, 2013Applicant: Kokusan Denki Co., Ltd.Inventors: Nozomu Katsumata, Masaki Asari, Hirofumi Yamaguchi, Shuichi Muramatsu, Ryosuke Tonooka, Shinji Komatsu
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Patent number: 7741708Abstract: A semiconductor device having a plurality of semiconductor chips mounted on a lead frame (10) and required portions covered with seal portions in which: the plurality of semiconductor chips are divided into a first group of semiconductor chips (Dx to Dz) and a second group of semiconductor chips (Du to Dw and Thx to Thz); both groups of semiconductor chips are mounted on the lead frame (10) at a distance from each other; the seal portions are comprised of first and second resin-seal portions (41 and 42) which cover the first and second groups of semiconductor chips, respectively, along with required portions of the lead frame; both resin-seal portions are mechanically coupled with each other by coupling portions; and a group of read terminals respectively connected to circuits within the first resin-seal portion and circuits within the second resin-seal portion are led out through a gap between the first resin-seal portion (41) and the second resin-seal portion (42).Type: GrantFiled: December 9, 2005Date of Patent: June 22, 2010Assignee: Kokusan Denki Co., Ltd.Inventors: Shuichi Muramatsu, Hidetoshi Suzuki, Tomoyuki Sato, Kazuo Hara, Motoki Yamazaki, Masaki Asari, Hirofumi Yamaguchi
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Patent number: 7466108Abstract: A battery charging control device comprising a control circuit that performs control to keep a voltage across a battery charged by an output of an AC generator around a target value, comprising: a load driving switch inserted between the battery and a load; and a load driving switch control circuit that performs control to turn on the load driving switch when the AC generator generates the output and a voltage across the load is equal to or lower than a set value, and turn off the load driving switch when the voltage across the load exceeds the set value lower than the target value of the voltage across the battery.Type: GrantFiled: January 12, 2007Date of Patent: December 16, 2008Assignee: Kokusan Denki Co., Ltd.Inventors: Hidetoshi Suzuki, Hirofumi Yamaguchi, Shuichi Muramatsu, Masaki Asari
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Publication number: 20080290477Abstract: A semiconductor device having a plurality of semiconductor chips mounted on a lead frame (10) and required portions covered with seal portions in which: the plurality of semiconductor chips are divided into a first group of semiconductor chips (Dx to Dz) and a second group of semiconductor chips (Du to Dw and Thx to Thz); both groups of semiconductor chips are mounted on the lead frame (10) at a distance from each other; the seal portions are comprised of first and second resin-seal portions (41 and 42) which cover the first and second groups of semiconductor chips, respectively, along with required portions of the lead frame; both resin-seal portions are mechanically coupled with each other by coupling portions; and a group of read terminals respectively connected to circuits within the first resin-seal portion and circuits within the second resin-seal portion are led out through a gap between the first resin-seal portion (41) and the second resin-seal portion (42).Type: ApplicationFiled: December 9, 2005Publication date: November 27, 2008Applicant: Kokusan Denki Co., Ltd.Inventors: Shuichi Muramatsu, Hidetoshi Suzuki, Tomoyuki Sato, Kazuo Hara, Motoki Yamazaki, Masaki Asari, Hirofumi Yamaguchi
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Publication number: 20070164713Abstract: A battery charging control device comprising a control circuit that performs control to keep a voltage across a battery charged by an output of an AC generator around a target value, comprising: a load driving switch inserted between the battery and a load; and a load driving switch control circuit that performs control to turn on the load driving switch when the AC generator generates the output and a voltage across the load is equal to or lower than a set value, and turn off the load driving switch when the voltage across the load exceeds the set value lower than the target value of the voltage across the battery.Type: ApplicationFiled: January 12, 2007Publication date: July 19, 2007Applicant: Kokusan Denki Co., Ltd.Inventors: Hidetoshi Suzuki, Hirofumi Yamaguchi, Shuichi Muramatsu, Masaki Asari