Patents by Inventor Hisashi Kameyama
Hisashi Kameyama 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: 11303141Abstract: A protection circuit for a battery includes a discharge FET, a control circuit, a first small-signal FET, and a second small-signal FET. The discharge FET connected in series to a battery interrupts an electric current. The control circuit switches on or off the discharge FET. The first small-signal FET connected in parallel between a gate (G) and a source (S) of the discharge FET is switched to an ON state, to set a gate voltage of the discharge FET to an OFF-state voltage. The second small-signal FET connected in parallel between G and S of the discharge FET detects a voltage between a drain (D) and S of the discharge FET. When the voltage between D and S of the discharge FET exceeds a preset voltage, the second small-signal FET is switched to an ON state to set the gate voltage of the discharge FET to the OFF-state voltage.Type: GrantFiled: July 12, 2018Date of Patent: April 12, 2022Assignee: SANYO Electric Co., Ltd.Inventors: Tetsuya Kawasaki, Hisashi Kameyama, Naoki Kawai, Takahiro Yamashita
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Patent number: 11043825Abstract: A power supply device includes a spike absorption circuit that suppresses an avalanche breakage of a current shutdown switch due to a kickback voltage that may appear in response to the cut-off of a load current. The current shutdown switch is connected to secondary batteries. The spike absorption circuit is a series circuit of a protection switch, formed of a semiconductor element, and a diode. The power supply device further includes: a small-signal switch that controls turn-on and turn-off of the protection switch; and a delay circuit that maintains the small-signal switch in an ON state over a setup time after a current shutdown timing of the current shutdown switch. The delay circuit maintains the small-signal switch in the ON state over the setup time (T), and the small-signal switch thereby causes the protection switch to the ON state. Then, the spike absorption circuit damps the kickback voltage.Type: GrantFiled: October 12, 2017Date of Patent: June 22, 2021Assignee: SANYO Electric Co., Ltd.Inventors: Motoji Takeuchi, Yusuke Omote, Takuya Hirota, Hisashi Kameyama, Jeewook Chang, Mitsuhiro Hamada
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Publication number: 20200235591Abstract: A protection circuit for a battery includes a discharge FET, a control circuit, a first small-signal FET, and a second small-signal FET. The discharge FET connected in series to a battery interrupts an electric current. The control circuit switches on or off the discharge FET. The first small-signal FET connected in parallel between a gate (G) and a source (S) of the discharge FET is switched to an ON state, to set a gate voltage of the discharge FET to an OFF-state voltage. The second small-signal FET connected in parallel between G and S of the discharge FET detects a voltage between a drain (D) and S of the discharge FET. When the voltage between D and S of the discharge FET exceeds a preset voltage, the second small-signal FET is switched to an ON state to set the gate voltage of the discharge FET to the OFF-state voltage.Type: ApplicationFiled: July 12, 2018Publication date: July 23, 2020Applicant: SANYO Electric Co., Ltd.Inventors: Tetsuya Kawasaki, Hisashi Kameyama, Naoki Kawai, Takahiro Yamashita
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Publication number: 20190245359Abstract: A power supply device includes a spike absorption circuit that suppresses an avalanche breakage of a current shutdown switch due to a kickback voltage that may appear in response to the cut-off of a load current. The current shutdown switch is connected to secondary batteries. The spike absorption circuit is a series circuit of a protection switch, formed of a semiconductor element, and a diode. The power supply device further includes: a small-signal switch that controls turn-on and turn-off of the protection switch; and a delay circuit that maintains the small-signal switch in an ON state over a setup time after a current shutdown timing of the current shutdown switch. The delay circuit maintains the small-signal switch in the ON state over the setup time (T), and the small-signal switch thereby causes the protection switch to the ON state. Then, the spike absorption circuit damps the kickback voltage.Type: ApplicationFiled: October 12, 2017Publication date: August 8, 2019Applicant: SANYO Electric Co., Ltd.Inventors: Motoji Takeuchi, Yusuke Omote, Takuya Hirota, Hisashi Kameyama, Jeewook Chang, Mitsuhiro Hamada
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Patent number: 10164452Abstract: The battery pack including a battery group in which a plurality of secondary batteries are connected in series; a detector that detects a charging and discharging current value flowing in the battery group and a voltage value of the battery group in a time-division manner by switching between the current value and the voltage value using an electronic circuit; and a controller/operator that performs operation and control using the current value and the voltage value detected by the detector. In the battery pack, the detector detects current values before and after the voltage value of the battery group is detected, and the controller/operator determines that the voltage value of the battery group is influenced by the peak discharge power when at least one of the current values exceeds a predetermined threshold.Type: GrantFiled: May 13, 2014Date of Patent: December 25, 2018Assignee: SANYO ELECTRIC CO., LTD.Inventors: Hisanori Amasaki, Naoto Matsuda, Hisashi Kameyama
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Publication number: 20160079788Abstract: The battery pack including a battery group in which a plurality of secondary batteries are connected in series; a detector that detects a charging and discharging current value flowing in the battery group and a voltage value of the battery group in a time-division manner by switching between the current value and the voltage value using an electronic circuit; and a controller/operator that performs operation and control using the current value and the voltage value detected by the detector. In the battery pack, the detector detects current values before and after the voltage value of the battery group is detected, and the controller/operator determines that the voltage value of the battery group is influenced by the peak discharge power when at least one of the current values exceeds a predetermined threshold.Type: ApplicationFiled: May 13, 2014Publication date: March 17, 2016Inventors: HISANORI AMASAKI, NAOTO MATSUDA, HISASHI KAMEYAMA
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Patent number: 8405356Abstract: A full charge capacity value correction circuit includes: a current detection portion which detects a current value in a secondary battery; a voltage detection portion which detects a terminal voltage value of the secondary battery; a capacity storage portion which stores a full charge capacity value of the secondary battery; a remaining quantity calculation portion which calculates a remaining charging quantity in the secondary battery a remaining quantity estimation portion which estimates a remaining quantity of the secondary battery and a full charge capacity value correction portion which, when an estimated remaining quantity becomes equal to a reference value set in advance, adds a difference electrical quantity, to the full charge capacity value stored in the capacity storage portion, or subtracts the difference electrical quantity from the full charge capacity value stored in the capacity storage portion based on an estimated remaining quantity and an accumulated remaining quantity.Type: GrantFiled: February 28, 2011Date of Patent: March 26, 2013Assignee: Panasonic CorporationInventors: Masato Nakayama, Toshiyuki Nakatsuji, Hisashi Kameyama
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Publication number: 20120105014Abstract: A full charge capacity value correction circuit, has: a current detection portion which detects a current value of current flowing in a secondary battery; a voltage detection portion which detects a terminal voltage value of the secondary battery; a capacity storage portion which stores a full charge capacity value indicating a full charge capacity of the secondary battery; a remaining quantity calculation portion which calculates, as a accumulated remaining quantity, a remaining charging quantity in the secondary battery from a total value obtained by cumulatively adding charged electrical quantities and subtracting discharged electrical quantities in the secondary battery, based on charge/discharge currents of the secondary battery detected by the current detection portion; a remaining quantity estimation portion which estimates, as an estimated remaining quantity, a remaining quantity of the secondary battery by using a terminal voltage value detected by the voltage detection portion; and a full charge capType: ApplicationFiled: February 28, 2011Publication date: May 3, 2012Applicant: PANASONIC CORPORATIONInventors: Masato Nakayama, Toshiyuki Nakatsuji, Hisashi Kameyama