Patents by Inventor Eiki Imaizumi
Eiki Imaizumi 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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Publication number: 20230314521Abstract: A battery voltage monitoring device includes a clock generation circuit; a switch circuit including first and second N-type transistors and first and second P-type transistors of which sources and back gates are connected to each other, with a drain of one of the first N-type transistor and the first P-type transistor connected to the other source, one source connected to a signal input unit, and the other drain connected to a signal output unit, and a source of one of the second N-type transistor and the second P-type transistor connected to the other source, one source connected to a signal input unit, and the other drain connected to a signal output unit; a first generation circuit generating first and second control signals for the first and second P-type transistors, respectively; and a second generation circuit generating third and fourth control signals for the first and second N-type transistors, respectively.Type: ApplicationFiled: March 15, 2023Publication date: October 5, 2023Applicants: ABLIC Inc., Tianjin Lishen Battery Co., Ltd.Inventors: Eiki IMAIZUMI, Toshiyuki UCHIDA, Biao SHEN, Kazuhisa SUZUKI
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Patent number: 11016524Abstract: The analog switch includes: a clock generation circuit configured to generate a first clock and a second clock; a transfer circuit including an NMOS transistor having a source and a back gate connected to each other, and a PMOS transistor having a source and a back gate connected to each other, one of which has a drain connected to the source of the other, and a source connected to a signal input terminal, and the other of which has a drain connected to a signal output terminal; a first control signal generation circuit configured to generate a control signal for switching the PMOS transistor based on a voltage at the signal input terminal and the first clock; and a second control signal generation circuit configured to generate a control signal for switching the NMOS transistor based on the voltage at the signal input terminal and the second clock.Type: GrantFiled: October 2, 2020Date of Patent: May 25, 2021Assignee: ABLIC INC.Inventor: Eiki Imaizumi
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Publication number: 20210116957Abstract: The analog switch includes: a clock generation circuit configured to generate a first clock and a second clock; a transfer circuit including an NMOS transistor having a source and a back gate connected to each other, and a PMOS transistor having a source and a back gate connected to each other, one of which has a drain connected to the source of the other, and a source connected to a signal input terminal, and the other of which has a drain connected to a signal output terminal; a first control signal generation circuit configured to generate a control signal for switching the PMOS transistor based on a voltage at the signal input terminal and the first clock; and a second control signal generation circuit configured to generate a control signal for switching the NMOS transistor based on the voltage at the signal input terminal and the second clock.Type: ApplicationFiled: October 2, 2020Publication date: April 22, 2021Inventor: Eiki IMAIZUMI
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Patent number: 10573936Abstract: Provided is a low-cost battery pack capable of predicting a remaining battery life of a rechargeable battery with high accuracy. A remaining battery life prediction device includes: a voltage detection unit configured to measure a battery voltage and a battery temperature of the battery; a calculation unit configured to perform predictive calculation of a remaining battery life based on the battery voltage and the battery temperature; and a control unit configured to control operation of the remaining battery life prediction device and the calculation unit, the remaining battery life prediction device being configured to predict a remaining life of the battery with a calculation flow of for a predetermined time period, recursively calculating the remaining battery life based on the measured battery voltage and battery temperature and an internal impedance of the battery in a battery equivalent circuit.Type: GrantFiled: November 17, 2015Date of Patent: February 25, 2020Assignee: ABLIC INC.Inventor: Eiki Imaizumi
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Patent number: 10461769Abstract: A ?? modulator includes a first integrator which has first and second capacitors and integrates an analog input signal and a feedback analog signal, a second integrator which has third and fourth capacitors and integrates an output signal of the first integrator, a differential amplifier which has input and output terminals switched and connected via a switch circuit to either the first and second capacitors or the third and fourth capacitors, a chopper switch which switches the polarity of the input terminal and the polarity of the output terminal, to both of which the first capacitor and the second capacitor are connected, a quantizer which compares an added signal and a reference signal to output a digital value, and a digital/analog converter which outputs the feedback analog signal corresponding to the digital value.Type: GrantFiled: September 27, 2018Date of Patent: October 29, 2019Assignee: ABLIC INC.Inventor: Eiki Imaizumi
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Patent number: 10277175Abstract: In order to realize a circuit in a subsequent stage with a smaller circuit scale with respect to a single-ended input of a large signal, a double-sampling switched-capacitor input circuit includes a first switched-capacitor input circuit, which includes first capacitors for double sampling, and a second switched-capacitor input circuit, which includes second capacitors for double sampling, and which is configured to operate in opposite phase to the first switched-capacitor input circuit, the double-sampling switched-capacitor input circuit having a configuration in which the first capacitors and the second capacitors have different values, and in which the value of the second capacitors is adjusted so that a signal is attenuated.Type: GrantFiled: February 24, 2017Date of Patent: April 30, 2019Assignee: ABLIC INC.Inventor: Eiki Imaizumi
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Publication number: 20190097647Abstract: A ?? modulator includes a first integrator which has first and second capacitors and integrates an analog input signal and a feedback analog signal, a second integrator which has third and fourth capacitors and integrates an output signal of the first integrator, a differential amplifier which has input and output terminals switched and connected via a switch circuit to either the first and second capacitors or the third and fourth capacitors, a chopper switch which switches the polarity of the input terminal and the polarity of the output terminal, to both of which the first capacitor and the second capacitor are connected, a quantizer which compares an added signal and a reference signal to output a digital value, and a digital/analog converter which outputs the feedback analog signal corresponding to the digital value.Type: ApplicationFiled: September 27, 2018Publication date: March 28, 2019Inventor: Eiki Imaizumi
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Patent number: 10191117Abstract: To provide a battery pack capable of performing a highly accurate prediction of a remaining power of a battery while being low in cost. A battery remaining power predicting device includes a voltage detection portion which measures a voltage and a temperature of a battery, a computing portion which predicts and calculates a remaining power of the battery, and a controller which controls the computing portion, and has a battery remaining power predicting flow for regressively calculating the battery remaining power, and a secular change estimating flow for estimating a secular change in battery characteristics, using a case where a battery current is in a constant current state.Type: GrantFiled: March 15, 2016Date of Patent: January 29, 2019Assignee: ABLIC INC.Inventor: Eiki Imaizumi
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Patent number: 10060986Abstract: A battery remaining power predicting device predicts a remaining power of a battery by a first computing flow for regressively calculating a battery open circuit voltage and the battery remaining power, based on a battery voltage and a battery temperature both measured, and a current value and a battery internal resistance calculated from a change in the battery remaining power. Further, the battery remaining power predicting device predicts the remaining power of the battery by a second computing flow for calculating a battery capacity and a battery internal resistance, based on a battery remaining power before the start of a constant current discharge, a battery voltage immediately before the stop of the constant current discharge, and a settled battery voltage after the stop of the constant current discharge, after the constant current discharge is performed for a predetermined period as a battery load.Type: GrantFiled: March 3, 2016Date of Patent: August 28, 2018Assignee: ABLIC INC.Inventor: Eiki Imaizumi
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Patent number: 10024924Abstract: Provided is a low-cost battery pack capable of predicting a remaining battery life of a rechargeable battery with more accuracy while being capable of dealing with a variation in battery characteristics. In a remaining battery life prediction device, a constant current source configured to cause a constant current to flow through a battery as a load current is provided, battery voltages before and after the constant current as the load current is caused to flow through the battery are measured at a plurality of time points, and a battery internal resistance is calculated based on a change over time of the battery voltage.Type: GrantFiled: March 3, 2016Date of Patent: July 17, 2018Assignee: ABLIC INC.Inventor: Eiki Imaizumi
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Publication number: 20170250661Abstract: In order to realize a circuit in a subsequent stage with a smaller circuit scale with respect to a single-ended input of a large signal, a double-sampling switched-capacitor input circuit includes a first switched-capacitor input circuit, which includes first capacitors for double sampling, and a second switched-capacitor input circuit, which includes second capacitors for double sampling, and which is configured to operate in opposite phase to the first switched-capacitor input circuit, the double-sampling switched-capacitor input circuit having a configuration in which the first capacitors and the second capacitors have different values, and in which the value of the second capacitors is adjusted so that a signal is attenuated.Type: ApplicationFiled: February 24, 2017Publication date: August 31, 2017Inventor: Eiki IMAIZUMI
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Patent number: 9651594Abstract: A battery remaining power predicting device is provided which is equipped with a first voltage detection portion which detects the voltage of a battery, a second voltage detection portion which detects a voltage across a current sense resistor for detecting a load current, a controller which predicts the remaining power of the battery, based on the values of the voltages detected by the first and second voltage detection portions, and a constant current source which allows a constant current to flow through the current sense resistor. The controller is configured to calculate a resistance value of the current sense resistor, based on the detected voltage of the second voltage detection portion when the load current flows, and the detected voltage of the second voltage detection portion when the load current and the constant current flow.Type: GrantFiled: May 14, 2015Date of Patent: May 16, 2017Assignee: SII SEMICONDUCTOR CORPORATIONInventor: Eiki Imaizumi
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Patent number: 9467163Abstract: A high-order delta-sigma modulator is realized with amplifying/integrating circuits each having a small circuit scale, to thereby provide a small-size and low-power consumption delta-sigma modulator having a high precision. The delta-sigma modulator including the amplifying/integrating circuits connected in series in a plurality of stages has a delta-sigma modulator configuration in which one of adjacent amplifying/integrating circuits includes a delay integrating circuit and another thereof includes a non-delay integrating circuit. In an actual circuit, one amplifying circuit is operated in a time division manner to be shared between the adjacent amplifying/integrating circuits. The circuit scale is reduced in this way.Type: GrantFiled: March 24, 2016Date of Patent: October 11, 2016Assignee: SII Semiconductor CorporationInventor: Eiki Imaizumi
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Publication number: 20160285471Abstract: A high-order delta-sigma modulator is realized with amplifying/integrating circuits each having a small circuit scale, to thereby provide a small-size and low-power consumption delta-sigma modulator having a high precision. The delta-sigma modulator including the amplifying/integrating circuits connected in series in a plurality of stages has a delta-sigma modulator configuration in which one of adjacent amplifying/integrating circuits includes a delay integrating circuit and another thereof includes a non-delay integrating circuit. In an actual circuit, one amplifying circuit is operated in a time division manner to be shared between the adjacent amplifying/integrating circuits. The circuit scale is reduced in this way.Type: ApplicationFiled: March 24, 2016Publication date: September 29, 2016Inventor: Eiki IMAIZUMI
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Publication number: 20160274193Abstract: To provide a battery pack capable of performing a highly accurate prediction of a remaining power of a battery while being low in cost. A battery remaining power predicting device includes a voltage detection portion which measures a voltage and a temperature of a battery, a computing portion which predicts and calculates a remaining power of the battery, and a controller which controls the computing portion, and has a battery remaining power predicting flow for regressively calculating the battery remaining power, and a secular change estimating flow for estimating a secular change in battery characteristics, using a case where a battery current is in a constant current state.Type: ApplicationFiled: March 15, 2016Publication date: September 22, 2016Inventor: Eiki IMAIZUMI
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Publication number: 20160266211Abstract: Provided is a low-cost battery pack capable of predicting a remaining battery life of a rechargeable battery with more accuracy while being capable of dealing with a variation in battery characteristics. In a remaining battery life prediction device, a constant current source configured to cause a constant current to flow through a battery as a load current is provided, battery voltages before and after the constant current as the load current is caused to flow through the battery are measured at a plurality of time points, and a battery internal resistance is calculated based on a change over time of the battery voltage.Type: ApplicationFiled: March 3, 2016Publication date: September 15, 2016Inventor: Eiki IMAIZUMI
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Publication number: 20160266209Abstract: A battery remaining power predicting device predicts a remaining power of a battery by a first computing flow for regressively calculating a battery open circuit voltage and the battery remaining power, based on a battery voltage and a battery temperature both measured, and a current value and a battery internal resistance calculated from a change in the battery remaining power. Further, the battery remaining power predicting device predicts the remaining power of the battery by a second computing flow for calculating a battery capacity and a battery internal resistance, based on a battery remaining power before the start of a constant current discharge, a battery voltage immediately before the stop of the constant current discharge, and a settled battery voltage after the stop of the constant current discharge, after the constant current discharge is performed for a predetermined period as a battery load.Type: ApplicationFiled: March 3, 2016Publication date: September 15, 2016Inventor: Eiki IMAIZUMI
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Publication number: 20160149272Abstract: Provided is a low-cost battery pack capable of predicting a remaining battery life of a rechargeable battery with high accuracy. A remaining battery life prediction device includes: a voltage detection unit configured to measure a battery voltage and a battery temperature of the battery; a calculation unit configured to perform predictive calculation of a remaining battery life based on the battery voltage and the battery temperature; and a control unit configured to control operation of the remaining battery life prediction device and the calculation unit, the remaining battery life prediction device being configured to predict a remaining life of the battery with a calculation flow of for a predetermined time period, recursively calculating the remaining battery life based on the measured battery voltage and battery temperature and an internal impedance of the battery in a battery equivalent circuit.Type: ApplicationFiled: November 17, 2015Publication date: May 26, 2016Inventor: Eiki IMAIZUMI
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Publication number: 20150331057Abstract: A battery remaining power predicting device is provided which is equipped with a first voltage detection portion which detects the voltage of a battery, a second voltage detection portion which detects a voltage across a current sense resistor for detecting a load current, a controller which predicts the remaining power of the battery, based on the values of the voltages detected by the first and second voltage detection portions, and a constant current source which allows a constant current to flow through the current sense resistor. The controller is configured to calculate a resistance value of the current sense resistor, based on the detected voltage of the second voltage detection portion when the load current flows, and the detected voltage of the second voltage detection portion when the load current and the constant current flow.Type: ApplicationFiled: May 14, 2015Publication date: November 19, 2015Inventor: Eiki IMAIZUMI
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Patent number: 7561095Abstract: A semiconductor integrated circuit device provided with a pipeline A-D conversion circuit in which the enhancement of accuracy and the reduction of power consumption are accomplished is provided. The pipeline A-D conversion circuit is connected in series with an input terminal to which an analog signal to be converted is inputted and has a plurality of stages. The stages other than the first stage connected with the input terminal through at least one stage, including the first stage that receives input signals from the input terminal are constructed as follows: each of the other stages is comprised of two or more sample and hold circuits and an amplifier connected in common with the two or more sample and hold circuits. The two or more sample and hold circuits are caused to perform interleave operation.Type: GrantFiled: August 15, 2007Date of Patent: July 14, 2009Assignee: Renesas Technology Corp.Inventors: Fumiyasu Sasaki, Eiki Imaizumi, Takanobu Anbo