Patents by Inventor Yoshihiro Motoichi
Yoshihiro Motoichi 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: 11462921Abstract: A secondary-battery protection circuit is configured to, in response to detecting that a first switching circuit is turned on and a second switching circuit is turned on, supply a first output voltage to a first load between a first terminal and a second terminal; and supply a third output voltage to a second load between the first terminal and a third terminal, the third output voltage indicating the sum of the first output voltage and a second output voltage, the second output voltage corresponding to a voltage across a second secondary battery. In response to detecting that the first switching circuit is turned off and the second switching circuit is turned on, the secondary-battery protection circuit is configured to stop supplying the first output voltage to the first load; and stop supplying the third output voltage via the first terminal and the third terminal.Type: GrantFiled: May 21, 2021Date of Patent: October 4, 2022Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Takeshi Yamaguchi, Yoshihiro Motoichi, Junji Takeshita
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Patent number: 11165261Abstract: A secondary battery protection circuit for protecting a secondary battery with multiple connected-in-parallel cells, includes a charging fault detection unit for each cell for prohibiting charging of the corresponding cell when overcharging and/or charging over-current for the corresponding cell is detected; a charging control element for each cell for cutting off a charging path for the corresponding cell when the charging of the corresponding cell is prohibited; a detection resistor for each cell inserted in series in the charging path; and a balance control unit for, in order to balance a first charging current flowing in a first charging path for a first cell with a second charging current flowing in a second charging path for a second cell, controlling a difference between the first and second charging currents in a saturation region of the charging control element based on a detection voltage generated by the detection resistor.Type: GrantFiled: June 25, 2018Date of Patent: November 2, 2021Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Yoshihiro Motoichi, Iwao Kitamura
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Publication number: 20210273463Abstract: A secondary-battery protection circuit is configured to, in response to detecting that a first switching circuit is turned on and a second switching circuit is turned on, supply a first output voltage to a first load between a first terminal and a second terminal; and supply a third output voltage to a second load between the first terminal and a third terminal, the third output voltage indicating the sum of the first output voltage and a second output voltage, the second output voltage corresponding to a voltage across a second secondary battery. In response to detecting that the first switching circuit is turned off and the second switching circuit is turned on, the secondary-battery protection circuit is configured to stop supplying the first output voltage to the first load; and stop supplying the third output voltage via the first terminal and the third terminal.Type: ApplicationFiled: May 21, 2021Publication date: September 2, 2021Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Takeshi YAMAGUCHI, Yoshihiro MOTOICHI, Junji TAKESHITA
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Patent number: 11056845Abstract: A plug with a cable includes a plug and a cable. The plug is connected to a receptacle to which a secondary cell is connected. The plug includes a housing and a substrate therein. The cable includes a power supply line and a grounding line. The cable has one end connected to the plug and the other end connected to a power supply unit. A switch is mounted on the substrate and provided in series in a power supply interconnection connected to the power supply line. A temperature sensor is mounted on the substrate and disposed near a power supply terminal or a grounding terminal of the plug. A control circuit is mounted on the substrate and configured to interrupt the power supply interconnection by turning off the switch when a temperature detected by the temperature sensor exceeds a predetermined value.Type: GrantFiled: November 28, 2018Date of Patent: July 6, 2021Assignee: MITSUMI ELECTRIC CO., LTD.Inventor: Yoshihiro Motoichi
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Patent number: 11018515Abstract: A secondary-battery protection circuit is configured to, in response to detecting that a first switching circuit is turned on and a second switching circuit is turned on, supply a first output voltage to a first load between a first terminal and a second terminal; and supply a third output voltage to a second load between the first terminal and a third terminal, the third output voltage indicating the sum of the first output voltage and a second output voltage, the second output voltage corresponding to a voltage across a second secondary battery. In response to detecting that the first switching circuit is turned off and the second switching circuit is turned on, the secondary-battery protection circuit is configured to stop supplying the first output voltage to the first load; and stop supplying the third output voltage via the first terminal and the third terminal.Type: GrantFiled: December 3, 2019Date of Patent: May 25, 2021Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Takeshi Yamaguchi, Yoshihiro Motoichi, Junji Takeshita
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Patent number: 10790679Abstract: A battery protection circuit that protects a rechargeable battery including cells connected in parallel includes an overcharging detection part provided for each of the cells and configured to prevent the corresponding cell from being charged in response to detecting overcharging of the corresponding cell, an overdischarge detection part provided for each of the cells and configured to prevent the corresponding cell from being discharged in response to detecting overdischarge of the corresponding cell, a charging current limiting part provided for each of the cells and configured to prevent a charging current from exceeding a predetermined charging current value during a period for which the charging current flows through the corresponding cell, and a discharge current limiting part provided for each of the cells and configured to prevent a discharge current from exceeding a predetermined discharge current value during a period for which the discharge current flows through the corresponding cell.Type: GrantFiled: September 26, 2014Date of Patent: September 29, 2020Assignee: MITSUMI ELECTRIC CO., LTD.Inventor: Yoshihiro Motoichi
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Publication number: 20200185937Abstract: A secondary-battery protection circuit is configured to, in response to detecting that a first switching circuit is turned on and a second switching circuit is turned on, supply a first output voltage to a first load between a first terminal and a second terminal; and supply a third output voltage to a second load between the first terminal and a third terminal, the third output voltage indicating the sum of the first output voltage and a second output voltage, the second output voltage corresponding to a voltage across a second secondary battery. In response to detecting that the first switching circuit is turned off and the second switching circuit is turned on, the secondary-battery protection circuit is configured to stop supplying the first output voltage to the first load; and stop supplying the third output voltage via the first terminal and the third terminal.Type: ApplicationFiled: December 3, 2019Publication date: June 11, 2020Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Takeshi YAMAGUCHI, Yoshihiro MOTOICHI, Junji TAKESHITA
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Patent number: 10439338Abstract: A plug with a cable includes a plug and a cable. The plug is connected to a receptacle to which a secondary cell is connected. The plug includes a hosing and a substrate therein. The cable includes a power supply line and a grounding line. The cable has one end connected to the plug and the other end connected to a power supply unit. A switch is mounted on the substrate and provided in series in a power supply interconnection connected to the power supply line. A temperature sensor is mounted on the substrate and disposed near a power supply terminal or a grounding terminal of the plug. A control circuit is mounted on the substrate and configured to interrupt the power supply interconnection by turning off the switch when a temperature detected by the temperature sensor exceeds a predetermined value.Type: GrantFiled: July 21, 2015Date of Patent: October 8, 2019Assignee: MITSUMI ELECTRIC CO., LTD.Inventor: Yoshihiro Motoichi
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Publication number: 20190148894Abstract: A plug with a cable includes a plug and a cable. The plug is connected to a receptacle to which a secondary cell is connected. The plug includes a housing and a substrate therein. The cable includes a power supply line and a grounding line. The cable has one end connected to the plug and the other end connected to a power supply unit. A switch is mounted on the substrate and provided in series in a power supply interconnection connected to the power supply line. A temperature sensor is mounted on the substrate and disposed near a power supply terminal or a grounding terminal of the plug. A control circuit is mounted on the substrate and configured to interrupt the power supply interconnection by turning off the switch when a temperature detected by the temperature sensor exceeds a predetermined value.Type: ApplicationFiled: November 28, 2018Publication date: May 16, 2019Applicant: MITSUMI ELECTRIC CO., LTD.Inventor: Yoshihiro MOTOICHI
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Publication number: 20190020074Abstract: A secondary battery protection circuit for protecting a secondary battery with multiple connected-in-parallel cells, includes a charging fault detection unit for each cell for prohibiting charging of the corresponding cell when overcharging and/or charging over-current for the corresponding cell is detected; a charging control element for each cell for cutting off a charging path for the corresponding cell when the charging of the corresponding cell is prohibited; a detection resistor for each cell inserted in series in the charging path; and a balance control unit for, in order to balance a first charging current flowing in a first charging path for a first cell with a second charging current flowing in a second charging path for a second cell, controlling a difference between the first and second charging currents in a saturation region of the charging control element based on a detection voltage generated by the detection resistor.Type: ApplicationFiled: June 25, 2018Publication date: January 17, 2019Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Yoshihiro MOTOICHI, Iwao KITAMURA
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Publication number: 20160094065Abstract: A battery protection circuit that protects a rechargeable battery including cells connected in parallel includes an overcharging detection part provided for each of the cells and configured to prevent the corresponding cell from being charged in response to detecting overcharging of the corresponding cell, an overdischarge detection part provided for each of the cells and configured to prevent the corresponding cell from being discharged in response to detecting overdischarge of the corresponding cell, a charging current limiting part provided for each of the cells and configured to prevent a charging current from exceeding a predetermined charging current value during a period for which the charging current flows through the corresponding cell, and a discharge current limiting part provided for each of the cells and configured to prevent a discharge current from exceeding a predetermined discharge current value during a period for which the discharge current flows through the corresponding cell.Type: ApplicationFiled: September 26, 2014Publication date: March 31, 2016Applicant: MITSUMI ELECTRIC CO., LTD.Inventor: Yoshihiro MOTOICHI
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Publication number: 20160056588Abstract: A plug with a cable includes a plug and a cable. The plug is connected to a receptacle to which a secondary cell is connected. The plug includes a hosing and a substrate therein. The cable includes a power supply line and a grounding line. The cable has one end connected to the plug and the other end connected to a power supply unit. A switch is mounted on the substrate and provided in series in a power supply interconnection connected to the power supply line. A temperature sensor is mounted on the substrate and disposed near a power supply terminal or a grounding terminal of the plug. A control circuit is mounted on the substrate and configured to interrupt the power supply interconnection by turning off the switch when a temperature detected by the temperature sensor exceeds a predetermined value.Type: ApplicationFiled: July 21, 2015Publication date: February 25, 2016Applicant: MITSUMI ELECTRIC CO., LTD.Inventor: Yoshihiro MOTOICHI
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Patent number: 8558516Abstract: A charge-controlling semiconductor integrated circuit includes a current- controlling MOS transistor which is connected between a voltage input terminal and an output terminal and controls flowing current, a substratum voltage switching circuit connected between the voltage input/output terminal and a substratum to which an input/output voltage is applied, and a voltage comparison circuit to compare the input/output voltage. The charge-controlling semiconductor integrated circuit controls the substratum voltage switching circuit based on an output of the voltage comparison circuit, and the voltage comparison circuit includes an intentional offset in a first potential direction. A level shift circuit to shift the output voltage to a potential direction opposite to the first potential direction is provided in a preceding stage of a first input terminal of the voltage comparison circuit, and the input voltage is input to a second input terminal of the voltage comparison circuit.Type: GrantFiled: May 18, 2009Date of Patent: October 15, 2013Assignee: Mitsumi Electric Co., Ltd.Inventors: Yoshihiro Takahashi, Daisuke Suzuki, Yoshihiro Motoichi, Gentaro Kurokawa
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Patent number: 8035355Abstract: Disclosed is a charge-controlling semiconductor integrated circuit including: a current-controlling MOS transistor; a current detection circuit including a 1/N size current-detecting MOS transistor; and a gate voltage control circuit, wherein the current detection circuit includes an operational amplifier circuit, a bias condition of the current-detecting MOS transistor becomes same as the current-controlling MOS transistor based on an operational amplifier circuit output, voltage drops in lines from drain electrode to a corresponding input point of the operational amplifier circuit become the same by a parasitic resistance, and when the output of the operational amplifier circuit is applied to a control terminal of the bias condition controlling transistor, the drain voltages become the same potential, and the line from the drain electrode of the current-detecting MOS transistor to the input point is formed to be redundantly arranged inside the chip so that a parasitic resistance becomes a predetermined valuType: GrantFiled: June 4, 2009Date of Patent: October 11, 2011Assignee: Mitsumi Electric Co., Ltd.Inventors: Yoshihiro Motoichi, Daisuke Suzuki, Yoshihiro Takahashi, Gentaro Kurokawa
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Publication number: 20090302805Abstract: Disclosed is a charge-controlling semiconductor integrated circuit including: a current-controlling MOS transistor; a current detection circuit including a 1/N size current-detecting MOS transistor; and a gate voltage control circuit, wherein the current detection circuit includes an operational amplifier circuit, a bias condition of the current-detecting MOS transistor becomes same as the current-controlling MOS transistor based on an operational amplifier circuit output, voltage drops in lines from drain electrode to a corresponding input point of the operational amplifier circuit become the same by a parasitic resistance, and when the output of the operational amplifier circuit is applied to a control terminal of the bias condition controlling transistor, the drain voltages become the same potential, and the line from the drain electrode of the current-detecting MOS transistor to the input point is formed to be redundantly arranged inside the chip so that a parasitic resistance becomes a predetermined valuType: ApplicationFiled: June 4, 2009Publication date: December 10, 2009Applicant: Mitsumi Electric Co. Ltd.Inventors: Yoshihiro MOTOICHI, Daisuke Suzuki, Yoshihiro Takahashi, Gentaro Kurokawa
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Publication number: 20090289605Abstract: Disclosed a charge-controlling semiconductor integrated circuit comprising: a current-controlling MOS transistor connected between a voltage input terminal and an output terminal and controls flowing current; a substratum voltage switching circuit connected between the voltage input/output terminal and a substratum to which an input/output voltage is applied; and a voltage comparison circuit to compare the input/output voltage, wherein the charge-controlling semiconductor integrated circuit controls the substratum voltage switching circuit based on an output of the voltage comparison circuit, the voltage comparison circuit includes an intentional offset in a first potential direction, and in a preceding stage of a first input terminal of the voltage comparison circuit, a level shift circuit to shift the output voltage to an opposite potential direction is provided, and to a second input terminal of the voltage comparison circuit, the input voltage is input.Type: ApplicationFiled: May 18, 2009Publication date: November 26, 2009Applicant: Mitsumi Electric Co. Ltd.Inventors: Yoshihiro TAKAHASHI, Daisuke Suzuki, Yoshihiro Motoichi, Gentaro Kurokawa