Patents by Inventor Jaesoo Byoun
Jaesoo Byoun 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: 20240162811Abstract: The present disclosure relates to systems, non-transitory computer-readable media, and methods for applying controllable current to portions of an electrodeposition device via a series-in-parallel-out rectifier circuit. In particular, the rectifier circuit includes a front-end stage that includes an alternating current-to-direct current converter circuit to generate one or more direct current signals from an alternating current signal of an input terminal. Additionally, the rectifier circuit includes a back-end stage including a plurality of direct current-to-direct current converter circuits that convert the one or more direct current signals into a plurality of child direct current signals. Furthermore, the plurality of direct current-to-direct current converter circuits of the disclosed series-in-parallel-out rectifier circuit are in physical contact with an anode of the electrodeposition device at a plurality of different positions to apply separate currents to different portions of the anode.Type: ApplicationFiled: October 12, 2023Publication date: May 16, 2024Inventors: Patrick Chapman, Jaesoo Byoun, David Okawa, Anton Hunt, Isaac Thomas, Guillermo Urquiza, Roger Bishop
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Publication number: 20240162803Abstract: The present disclosure relates to systems, non-transitory computer-readable media, and methods for applying controllable current to portions of an electrodeposition device via a series-in-parallel-out rectifier circuit. In particular, the rectifier circuit includes a front-end stage that includes an alternating current-to-direct current converter circuit to generate one or more direct current signals from an alternating current signal of an input terminal. Additionally, the rectifier circuit includes a back-end stage including a plurality of direct current-to-direct current converter circuits that convert the one or more direct current signals into a plurality of child direct current signals. Furthermore, the plurality of direct current-to-direct current converter circuits of the disclosed series-in-parallel-out rectifier circuit are in physical contact with an anode of the electrodeposition device at a plurality of different positions to apply separate currents to different portions of the anode.Type: ApplicationFiled: October 12, 2023Publication date: May 16, 2024Inventors: Patrick Chapman, Jaesoo Byoun, Dan Chown, David Okawa, Anton Hunt, Isaac Thomas
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Publication number: 20240158946Abstract: The present disclosure relates to systems, non-transitory computer-readable media, and methods for applying controllable current to portions of an electrodeposition device via a series-in-parallel-out rectifier circuit. In particular, the rectifier circuit includes a front-end stage that includes an alternating current-to-direct current converter circuit to generate one or more direct current signals from an alternating current signal of an input terminal. Additionally, the rectifier circuit includes a back-end stage including a plurality of direct current-to-direct current converter circuits that convert the one or more direct current signals into a plurality of child direct current signals. Furthermore, the plurality of direct current-to-direct current converter circuits of the disclosed series-in-parallel-out rectifier circuit are in physical contact with an anode of the electrodeposition device at a plurality of different positions to apply separate currents to different portions of the anode.Type: ApplicationFiled: October 12, 2023Publication date: May 16, 2024Inventors: Patrick Chapman, Jaesoo Byoun, Dan Chown, David Okawa, Anton Hunt, Isaac Thomas
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Patent number: 11978482Abstract: A data storage device has a closed loop extended park mode during spin down operation. A data storage device comprises a spindle motor configured to rotate one or more disks, and one or more processing devices. The one or more processing devices are configured to determine a value of current that is discharged from the spindle motor over time during a spin down of the spindle motor, and control a braking duty cycle for braking the spindle motor during the spin down such that the value of current discharged from the spindle motor over time does not exceed a selected current limit.Type: GrantFiled: January 17, 2022Date of Patent: May 7, 2024Assignee: Western Digital Technologies, Inc.Inventors: Brian Johnson, Jaesoo Byoun, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami
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Patent number: 11948603Abstract: Various illustrative aspects are directed to a data storage device comprising one or more disks, an actuator arm assembly comprising a voice coil motor (VCM), the VCM configured to operate in a first mode and a second, different mode, wherein the first mode corresponds to at least a first and a second setting, and a control circuitry configured to cause the VCM to seek towards a target track in the first mode using the first setting for a first duration, control transition of the VCM from the first to the second setting in the first mode, cause the VCM to seek towards the target track using the second setting for a second duration, and control transition of the VCM from the first to a second mode, wherein controlling the transitioning comprises seeking the VCM toward the target track in the second mode for a third duration.Type: GrantFiled: September 15, 2022Date of Patent: April 2, 2024Assignee: Western Digital Technologies, Inc.Inventors: Brian Johnson, Jaesoo Byoun, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami, Yasunori Fukuyama
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Publication number: 20240096370Abstract: Various illustrative aspects are directed to a data storage device comprising one or more disks, an actuator arm assembly comprising a voice coil motor (VCM), the VCM configured to operate in a first mode and a second, different mode, wherein the first mode corresponds to at least a first and a second setting, and a control circuitry configured to cause the VCM to seek towards a target track in the first mode using the first setting for a first duration, control transition of the VCM from the first to the second setting in the first mode, cause the VCM to seek towards the target track using the second setting for a second duration, and control transition of the VCM from the first to a second mode, wherein controlling the transitioning comprises seeking the VCM toward the target track in the second mode for a third duration.Type: ApplicationFiled: September 15, 2022Publication date: March 21, 2024Inventors: Brian Johnson, Jaesoo Byoun, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami, Yasunori Fukuyama
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Publication number: 20240062785Abstract: Various illustrative aspects are directed to a data storage device comprising a first spindle motor configured to rotate one or more disks in a first stack of disks, a second spindle motor configured to rotate one or more disks in a second stack of disks, and one or more processing devices configured to detect back electromotive force (BEMF) voltages generated by the first spindle motor and the second spindle motor. In other aspects the one or more processing devices can control speeds of the first spindle motor and the second spindle motor based on the detected BEMF voltages.Type: ApplicationFiled: November 2, 2023Publication date: February 22, 2024Inventors: Jaesoo Byoun, Brian Johnson, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami
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Patent number: 11862202Abstract: Various illustrative aspects are directed to a data storage device comprising a disk and a spindle motor configured to rotate the disk wherein the spindle motor is powered by a drive voltage generated in response to a host voltage. The data storage device includes a head configured to be actuated over the disk by a head actuator and control circuitry comprising an isolation field effect transistor (ISOFET) configured to prevent a reverse current from flowing from the drive voltage to the host voltage when the host voltage falls below a threshold. The control circuitry sets a turnoff current level at which the ISOFET is directed to turn off to prevent the reverse current from flowing determines a drain-source on resistance Rdson of the ISOFET, and calculates a voltage turnoff threshold at which the ISOFET is turned off from the turnoff current level and the determined Rdson.Type: GrantFiled: May 9, 2022Date of Patent: January 2, 2024Inventors: Brian Johnson, Jaesoo Byoun, Hideaki Ito, Gaku Ikedo, Naoyuki Kagami
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Patent number: 11837264Abstract: A data storage device comprises a lead actuator that actuates a first read-write head over a first disk and a support actuator that actuates a second read-write head over a second disk. A spindle motor rotates the first and second disks. In response to an emergency power off (EPO) event, a processing device retracts and parks the actuators using an internal supply voltage generated from a back electromotive force (BEMF) voltage of the spindle motor, and egresses data from a volatile to a non-volatile semiconductor memory. Egress is throttled before the actuators are retracted and parked when the internal supply voltage falls to or below a first egress throttling threshold voltage. Egress is throttled after the actuators are retracted and parked when the internal supply voltage falls to or below a second egress throttling threshold voltage.Type: GrantFiled: April 8, 2022Date of Patent: December 5, 2023Assignee: Western Digital Technologies, Inc.Inventors: Brian Johnson, Jaesoo Byoun, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami, Hiroki Watanabe
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Publication number: 20230386512Abstract: Various illustrative aspects are directed to a data storage device comprising one or more disks, an actuator arm assembly comprising one or more disk heads and a voice coil motor (VCM), the VCM configured to operate in a PWM mode and a linear mode, and one or more processing devices configured to: seek the VCM towards a target track in the PWM mode; transition the VCM from the PWM mode to the linear mode, wherein the transitioning comprises switching an offset compensation value from a first offset compensation value to a second compensation offset value to compensate for a transition offset induced while transitioning the VCM from the PWM to the linear mode, wherein the first and the second offset compensation values correspond to the PWM and linear modes, respectively, and seek the VCM towards the target track in the linear mode for a linear mode time.Type: ApplicationFiled: August 9, 2023Publication date: November 30, 2023Inventors: Jaesoo Byoun, Brian Johnson, Hideaki Ito, Gaku Ikedo, Naoyuki Kagami
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Publication number: 20230386513Abstract: A data storage device comprises a lead actuator that actuates a first read-write head over a first disk and a support actuator that actuates a second read-write head over a second disk. A spindle motor rotates the first and second disks. In response to an emergency power off (EPO) event, a processing device retracts and parks the actuators using an internal supply voltage generated from a back electromotive force (BEMF) voltage of the spindle motor, and brakes the spindle motor. The spindle motor is not braked until both the lead and support actuators have been retracted and parked.Type: ApplicationFiled: August 9, 2023Publication date: November 30, 2023Inventors: Brian Johnson, Jaesoo Byoun, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami, Hiroki Watanabe
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Patent number: 11823710Abstract: Various illustrative aspects are directed to a data storage device comprising a first spindle motor configured to rotate one or more disks in a first stack of disks, a second spindle motor configured to rotate one or more disks in a second stack of disks, and one or more processing devices configured to detect back electromotive force (BEMF) voltages generated by the first spindle motor and the second spindle motor. In other aspects the one or more processing devices can control speeds of the first spindle motor and the second spindle motor based on the detected BEMF voltages.Type: GrantFiled: February 24, 2022Date of Patent: November 21, 2023Assignee: Western Digital Technologies, Inc.Inventors: Jaesoo Byoun, Brian Johnson, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami
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Publication number: 20230360680Abstract: Various illustrative aspects are directed to a data storage device comprising a disk and a spindle motor configured to rotate the disk wherein the spindle motor is powered by a drive voltage generated in response to a host voltage. The data storage device includes a head configured to be actuated over the disk by a head actuator and control circuitry comprising an isolation field effect transistor (ISOFET) configured to prevent a reverse current from flowing from the drive voltage to the host voltage when the host voltage falls below a threshold. The control circuitry sets a turnoff current level at which the ISOFET is directed to turn off to prevent the reverse current from flowing determines a drain-source on resistance Rdson of the ISOFET, and calculates a voltage turnoff threshold at which the ISOFET is turned off from the turnoff current level and the determined Rdson.Type: ApplicationFiled: May 9, 2022Publication date: November 9, 2023Inventors: Brian Johnson, Jaesoo Byoun, Hideaki Ito, Gaku Ikedo, Naoyuki Kagami
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Publication number: 20230326484Abstract: A data storage device comprises a lead actuator that actuates a first read-write head over a first disk and a support actuator that actuates a second read-write head over a second disk. A spindle motor rotates the first and second disks. In response to an emergency power off (EPO) event, a processing device retracts and parks the actuators using an internal supply voltage generated from a back electromotive force (BEMF) voltage of the spindle motor, and egresses data from a volatile to a non-volatile semiconductor memory. Egress is throttled before the actuators are retracted and parked when the internal supply voltage falls to or below a first egress throttling threshold voltage. Egress is throttled after the actuators are retracted and parked when the internal supply voltage falls to or below a second egress throttling threshold voltage.Type: ApplicationFiled: April 8, 2022Publication date: October 12, 2023Inventors: Brian Johnson, Jaesoo Byoun, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami, Hiroki Watanabe
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Publication number: 20230326485Abstract: A data storage device comprises a lead actuator that actuates a first read-write head over a first disk and a support actuator that actuates a second read-write head over a second disk. A spindle motor rotates the first and second disks. In response to an emergency power off (EPO) event, a processing device retracts and parks the actuators using an internal supply voltage generated from a back electromotive force (BEMF) voltage of the spindle motor, and brakes the spindle motor. The spindle motor is not braked until both the lead and support actuators have been retracted and parked.Type: ApplicationFiled: April 8, 2022Publication date: October 12, 2023Inventors: Brian Johnson, Jaesoo Byoun, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami, Hiroki Watanabe
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Patent number: 11763844Abstract: A data storage device comprises a lead actuator that actuates a first read-write head over a first disk and a support actuator that actuates a second read-write head over a second disk. A spindle motor rotates the first and second disks. In response to an emergency power off (EPO) event, a processing device retracts and parks the actuators using an internal supply voltage generated from a back electromotive force (BEMF) voltage of the spindle motor, and brakes the spindle motor. The spindle motor is not braked until both the lead and support actuators have been retracted and parked.Type: GrantFiled: April 8, 2022Date of Patent: September 19, 2023Assignee: Western Digital Technologies, Inc.Inventors: Brian Johnson, Jaesoo Byoun, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami, Hiroki Watanabe
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Patent number: 11763843Abstract: Various illustrative aspects are directed to a data storage device comprising one or more disks, an actuator arm assembly comprising one or more disk heads and a voice coil motor (VCM), the VCM configured to operate in a PWM mode and a linear mode, and one or more processing devices configured to: seek the VCM towards a target track in the PWM mode; transition the VCM from the PWM mode to the linear mode, wherein the transitioning comprises switching an offset compensation value from a first offset compensation value to a second compensation offset value to compensate for a transition offset induced while transitioning the VCM from the PWM to the linear mode, wherein the first and the second offset compensation values correspond to the PWM and linear modes, respectively, and seek the VCM towards the target track in the linear mode for a linear mode time.Type: GrantFiled: May 11, 2022Date of Patent: September 19, 2023Assignee: Western Digital Technologies, Inc.Inventors: Jaesoo Byoun, Brian Johnson, Hideaki Ito, Gaku Ikedo, Naoyuki Kagami
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Patent number: 11749303Abstract: Various illustrative aspects are directed to a data storage device comprising one or more disks; an actuator arm assembly comprising one or more actuator arms, and configured to position the one or more actuator arms over disk surfaces of the one or more disks; one or more fine actuators, disposed on the one or more actuator arms; and one or more processing devices. The one or more processing devices are configured to: output a driver current to the one or more fine actuators, wherein the one or more processing devices are configured to rate limit a rise of the driver current over time during an activation of the driver current to within a selected rate limit of current rise over time.Type: GrantFiled: December 14, 2021Date of Patent: September 5, 2023Assignee: Western Digital Technologies, Inc.Inventors: Jaesoo Byoun, Brian Johnson, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami
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Publication number: 20230267960Abstract: Various illustrative aspects are directed to a data storage device comprising a first spindle motor configured to rotate one or more disks in a first stack of disks, a second spindle motor configured to rotate one or more disks in a second stack of disks, and one or more processing devices configured to detect back electromotive force (BEMF) voltages generated by the first spindle motor and the second spindle motor. In other aspects the one or more processing devices can control speeds of the first spindle motor and the second spindle motor based on the detected BEMF voltages.Type: ApplicationFiled: February 24, 2022Publication date: August 24, 2023Inventors: Jaesoo Byoun, Brian Johnson, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami
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Publication number: 20230230616Abstract: A data storage device has a closed loop extended park mode during spin down operation. A data storage device comprises a spindle motor configured to rotate one or more disks, and one or more processing devices. The one or more processing devices are configured to determine a value of current that is discharged from the spindle motor over time during a spin down of the spindle motor, and control a braking duty cycle for braking the spindle motor during the spin down such that the value of current discharged from the spindle motor over time does not exceed a selected current limit.Type: ApplicationFiled: January 17, 2022Publication date: July 20, 2023Inventors: Brian Johnson, Jaesoo Byoun, Gaku Ikedo, Hideaki Ito, Naoyuki Kagami