Patents by Inventor Keita Ikai
Keita Ikai 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: 11329586Abstract: In one embodiment, a motor control circuit may be configured as a current circuit that forms a sense current that is representative of at least a BEMF voltage from a motor, and to use the sense current to detect a substantially zero-crossing of the BEMF voltage.Type: GrantFiled: October 29, 2020Date of Patent: May 10, 2022Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventor: Keita Ikai
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Publication number: 20220140761Abstract: In one embodiment, a motor control circuit may be configured as a current circuit that forms a sense current that is representative of at least a BEMF voltage from a motor, and to use the sense current to detect a substantially zero-crossing of the BEMF voltage.Type: ApplicationFiled: October 29, 2020Publication date: May 5, 2022Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventor: Keita IKAI
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Patent number: 10860042Abstract: In one embodiment, a control circuit for a high side driver forms alternate signals to control a store mode and a maintain mode. An embodiment of the control circuit stores a voltage that is greater than an input voltage which results in storing a large charge for at least a portion of one of the cycles. The charge is used to supply operating voltage to the driver for at least a portion of another of the cycles.Type: GrantFiled: October 15, 2019Date of Patent: December 8, 2020Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Atsuhiro Ichikawa, Keita Ikai
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Patent number: 10775816Abstract: In one embodiment, a control circuit for a high side driver controls a store mode and a maintain mode. An embodiment of the control circuit stores a voltage that is greater than an input voltage which results in storing a large charge for at least a portion of one of the cycles. The charge is used to supply operating voltage to the driver for at least a portion of another of the cycles.Type: GrantFiled: October 15, 2019Date of Patent: September 15, 2020Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Atsuhiro Ichikawa, Keita Ikai
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Publication number: 20200225687Abstract: In one embodiment, a control circuit for a high side driver forms alternate signals to control a store mode and a maintain mode. An embodiment of the control circuit stores a voltage that is greater than an input voltage which results in storing a large charge for at least a portion of one of the cycles. The charge is used to supply operating voltage to the driver for at least a portion of another of the cycles.Type: ApplicationFiled: October 15, 2019Publication date: July 16, 2020Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Atsuhiro ICHIKAWA, Keita IKAI
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Publication number: 20200228111Abstract: In one embodiment, a control circuit for a high side driver controls a store mode and a maintain mode. An embodiment of the control circuit stores a voltage that is greater than an input voltage which results in storing a large charge for at least a portion of one of the cycles. The charge is used to supply operating voltage to the driver for at least a portion of another of the cycles.Type: ApplicationFiled: October 15, 2019Publication date: July 16, 2020Applicant: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLCInventors: Atsuhiro ICHIKAWA, Keita IKAI
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Patent number: 9973152Abstract: One example includes an amplifier system. The system includes a gain stage configured to conduct a gain current in response to an input voltage. The system also includes a current limit stage coupled to the gain stage and being configured to one of source and sink the gain current and to define a limit amplitude of the gain current during a current limit condition. The system further includes an output stage coupled to the gain stage and configured to conduct an output current through an output node in response to the gain current, the output current having a maximum amplitude during the current limit condition that is proportional to the limit amplitude.Type: GrantFiled: November 14, 2016Date of Patent: May 15, 2018Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Daijiro Otani, Keita Ikai
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Patent number: 9641066Abstract: A current driver is coupled to an inductor; a digital control for regulation of the current driver turns the current driver on or off coupled to the current driver; a comparator output coupled to the input of the digital control for regulation of the driver with inputs to compare a voltage of the inductor to a target voltage, a digital control for selection of one of a set of peaks and valleys of allowable current levels of the current driver, the digital control for selection of one of a set of peaks and valleys coupled to the output of the comparator and an input of the current driver, the digital control for the peak/valley current to monitor the duration of each high and low output state of the comparator output to determine the selection of one of the set of peak and valley of allowable current levels for the current driver.Type: GrantFiled: July 30, 2013Date of Patent: May 2, 2017Assignee: Texas Instruments IncorporatedInventors: Naoyuki Tsuruoka, Daijiro Otani, Keita Ikai, Masaki Yamashita
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Publication number: 20170063313Abstract: One example includes an amplifier system. The system includes a gain stage configured to conduct a gain current in response to an input voltage. The system also includes a current limit stage coupled to the gain stage and being configured to one of source and sink the gain current and to define a limit amplitude of the gain current during a current limit condition. The system further includes an output stage coupled to the gain stage and configured to conduct an output current through an output node in response to the gain current, the output current having a maximum amplitude during the current limit condition that is proportional to the limit amplitude.Type: ApplicationFiled: November 14, 2016Publication date: March 2, 2017Inventors: Daijiro Otani, Keita Ikai
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Patent number: 9495982Abstract: One example includes an amplifier system. The system includes a gain stage configured to conduct a gain current in response to an input voltage. The system also includes a current limit stage coupled to the gain stage and being configured to one of source and sink the gain current and to define a limit amplitude of the gain current during a current limit condition. The system further includes an output stage coupled to the gain stage and configured to conduct an output current through an output node in response to the gain current, the output current having a maximum amplitude during the current limit condition that is proportional to the limit amplitude.Type: GrantFiled: May 1, 2014Date of Patent: November 15, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Daijiro Otani, Keita Ikai
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Publication number: 20150318831Abstract: One example includes an amplifier system. The system includes a gain stage configured to conduct a gain current in response to an input voltage. The system also includes a current limit stage coupled to the gain stage and being configured to one of source and sink the gain current and to define a limit amplitude of the gain current during a current limit condition. The system further includes an output stage coupled to the gain stage and configured to conduct an output current through an output node in response to the gain current, the output current having a maximum amplitude during the current limit condition that is proportional to the limit amplitude.Type: ApplicationFiled: May 1, 2014Publication date: November 5, 2015Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: DAIJIRO OTANI, KEITA IKAI
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Publication number: 20140055107Abstract: A current driver is coupled to an inductor; a digital control for regulation of the current driver turns the current driver on or off coupled to the current driver; a comparator output coupled to the input of the digital control for regulation of the driver with inputs to compare a voltage of the inductor to a target voltage, a digital control for selection of one of a set of peaks and valleys of allowable current levels of the current driver, the digital control for selection of one of a set of peaks and valleys coupled to the output of the comparator and an input of the current driver, the digital control for the peak/valley current to monitor the duration of each high and low output state of the comparator output to determine the selection of one of the set of peak and valley of allowable current levels for the current driver.Type: ApplicationFiled: July 30, 2013Publication date: February 27, 2014Inventors: Naoyuki Tsuruoka, Daijiro Otani, Keita Ikai, Masaki Yamashita