Patents Assigned to Tokyo Rectifier Co., Ltd.
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Patent number: 8975870Abstract: A charging device supplies charge current to a battery group having plural secondary batteries connected in series to perform charging. In the charging device, a discharge route circuit for discharging charge current to be supplied to the secondary battery when the battery voltage of the secondary battery exceeds a predetermined voltage while charging is provided to every secondary battery. Also provided is a cut-off circuit for cutting off the discharge route circuit from each secondary battery after charging is completed. Discharge at a discharge route circuit is suppressed and energy efficiency is increased.Type: GrantFiled: March 31, 2009Date of Patent: March 10, 2015Assignees: Iwasaki Electric Co., Ltd., Tokyo Rectifier Co., Ltd., JPS Co., Ltd.Inventors: Tomomi Maruyama, Eiji Saiki, Akitoshi Kato, Yoshihiro Honda
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Patent number: 8810193Abstract: A charging apparatus for charging a cell group, in which a plurality of secondary cells are connected in series, by supplying a charging current Ic to the secondary cells is provided with an overcharge protection circuit including discharge route circuits 34 provided to each of the secondary cells and adapted to cause the secondary cells to discharge during charging by connecting the secondary cells to the discharge route circuits based on cell voltages Vb of the secondary cells or to stop discharging by cutting off the secondary cells from the discharge route circuits; and a charger controller for continuing charging while reducing the charging current Ic until the discharge of the secondary cell having started discharging to the discharge route circuit is stopped when the discharge of any one of the secondary cells to the discharge route circuit is started by the overcharge protection circuit.Type: GrantFiled: August 6, 2013Date of Patent: August 19, 2014Assignees: Iwasaki Electric Co., Ltd., Tokyo Rectifier Co., Ltd., JPS Co., Ltd.Inventors: Tomomi Maruyama, Eiji Saiki, Akitoshi Kato, Yoshihiro Honda
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Publication number: 20130314033Abstract: A charging apparatus for charging a cell group, in which a plurality of secondary cells are connected in series, by supplying a charging current Ic to the secondary cells is provided with an overcharge protection circuit including discharge route circuits 34 provided to each of the secondary cells and adapted to cause the secondary cells to discharge during charging by connecting the secondary cells to the discharge route circuits based on cell voltages Vb of the secondary cells or to stop discharging by cutting off the secondary cells from the discharge route circuits; and a charger controller for continuing charging while reducing the charging current Ic until the discharge of the secondary cell having started discharging to the discharge route circuit is stopped when the discharge of any one of the secondary cells to the discharge route circuit is started by the overcharge protection circuit.Type: ApplicationFiled: August 6, 2013Publication date: November 28, 2013Applicants: IWASAKI ELECTRIC CO., LTD., JPS CO., LTD., TOKYO RECTIFIER CO., LTD.Inventors: Tomomi Maruyama, Eiji Saiki, Akitoshi Kato, Yoshihiro Honda
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Patent number: 8531157Abstract: The present invention aims to suppress waste of charging power during charging and improve charging efficiency.Type: GrantFiled: February 16, 2009Date of Patent: September 10, 2013Assignees: Iwasaki Electric Co., Ltd., Tokyo Rectifier Co., Ltd., JPS Co., Ltd.Inventors: Tomomi Maruyama, Eiji Saiki, Akitoshi Kato, Yoshihiro Honda
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Patent number: 8305038Abstract: The present invention aims to reliably prevent overcharge by carrying out charging in just proportion during charging periods. A charging apparatus 1 for charging a secondary cell 22 by supplying a charging current Ic thereto is provided with a discharge amount detector 62 for detecting an amount of power discharged from the secondary cell in a non-charging state, a charge amount detector 60 for detecting an amount of power charged into the secondary cell in a charging state, and a charger controller 10 for stopping charging when the amount of charged power (charge amount Wc) becomes equal to the amount of discharged power (discharge amount Wc) during a charging period.Type: GrantFiled: February 16, 2009Date of Patent: November 6, 2012Assignees: Iwasaki Electric Co., Ltd., Tokyo Rectifier Co., Ltd., JPS Co. Ltd.Inventors: Tomomi Maruyama, Eiji Saiki, Akitoshi Kato, Yoshihiro Honda
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Publication number: 20120001595Abstract: A charging device supplies charge current to a battery group having plural secondary batteries connected in series to perform charging. In the charging device, a discharge route circuit for discharging charge current to be supplied to the secondary battery when the battery voltage of the secondary battery exceeds a predetermined voltage while charging is provided to every secondary battery. Also provided is a cut-off circuit for cutting off the discharge route circuit from each secondary battery after charging is completed. Discharge at a discharge route circuit is suppressed and energy efficiency is increased.Type: ApplicationFiled: March 31, 2009Publication date: January 5, 2012Applicants: Iwasaki Electric Co., Ltd., JPS Co., Ltd., Tokyo Rectifier Co., Ltd.Inventors: Tomomi Maruyama, Eiji Saiki, Akitoshi Kato, Yoshihiro Honda
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Publication number: 20110169454Abstract: The present invention aims to suppress waste of charging power during charging and improve charging efficiency.Type: ApplicationFiled: February 16, 2009Publication date: July 14, 2011Applicants: Iwasaki Electric Co., Ltd., Tokyo Rectifier Co., Ltd., JPS Co., Ltd.Inventors: Tomomi Maruyama, Eiji Saiki, Akitoshi Kato, Yoshihiro Honda
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Publication number: 20110169453Abstract: The present invention aims to reliably prevent overcharge by carrying out charging in just proportion during charging periods. A charging apparatus 1 for charging a secondary cell 22 by supplying a charging current Ic thereto is provided with a discharge amount detector 62 for detecting an amount of power discharged from the secondary cell in a non-charging state, a charge amount detector 60 for detecting an amount of power charged into the secondary cell in a charging state, and a charger controller 10 for stopping charging when the amount of charged power (charge amount Wc) becomes equal to the amount of discharged power (discharge amount Wc) during a charging period.Type: ApplicationFiled: February 16, 2009Publication date: July 14, 2011Applicants: Iwasaki Electric Co., Ltd., Tokyo Rectifier Co., Ltd., JPS Co., Ltd.Inventors: Tomomi Maruyama, Eiji Saiki, Akitoshi Kato, Yoshihiro Honda