Patents by Inventor Jye Sheng Hong
Jye Sheng Hong 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: 9197124Abstract: A power supply apparatus includes an inductor to store and discharge energy and a circuit to charge the inductor using a plurality of charging pulses. The circuit skips a charging pulse of the plurality of charging pulses to reduce overcurrent associated with the inductor.Type: GrantFiled: October 21, 2013Date of Patent: November 24, 2015Assignee: MARVELL WORLD TRADE LTD.Inventors: Biing Long Shu, Jinho Choi, Jye Sheng Hong, Ravishanker Krishnamoorthy
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Patent number: 8797012Abstract: In one embodiment, an apparatus includes output voltage comparison circuitry that compares an output voltage of a regulator and a reference voltage and outputs an output voltage comparison signal based on the comparison. Slope detection circuitry detects a slope of the output voltage and outputs a slope comparison signal based on the slope detected. Duty cycle determination circuitry receives the output voltage comparison signal and the slope comparison signal and outputs a pre-driver signal having a duty cycle based on the output voltage comparison signal and the slope comparison signal. The pre-driver signal is used to regulate the output voltage of the voltage regulator.Type: GrantFiled: January 18, 2013Date of Patent: August 5, 2014Assignee: Marvell International Ltd.Inventors: Siew Yong Chui, Rudy Kurniawan, Jye Sheng Hong
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Patent number: 8724255Abstract: The present disclosure includes systems and techniques relating to control of storage device, such as disk drives. A described technique includes controlling a motor to actuate a head within a storage device, the motor being associated with first and second states of electric current, where a duration of the first state is longer than a duration of the second state. Controlling the motor can include using both a first mode and a second mode to control current to the motor. The technique further includes detecting an instance of the first state, and initiating, when the instance of the first state is detected, a switch from the first mode to the second mode to control the motor. The switch can be based on a condition of operation with respect to the storage device. A start-up time of the second mode is shorter than the duration of the first state.Type: GrantFiled: December 21, 2012Date of Patent: May 13, 2014Assignee: Marvell International Ltd.Inventors: Jye Sheng Hong, Siew Yong Chui
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Publication number: 20140112035Abstract: A power supply apparatus includes an inductor to store and discharge energy and a circuit to charge the inductor using a plurality of charging pulses. The circuit skips a charging pulse of the plurality of charging pulses to reduce overcurrent associated with the inductor.Type: ApplicationFiled: October 21, 2013Publication date: April 24, 2014Applicant: Marvell World Trade Ltd.Inventors: Biing Long SHU, Jinho CHOI, Jye Sheng HONG, Ravishanker KRISHNAMOORTHY
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Patent number: 8593096Abstract: Analog control of the pulse width used to control the speed of a voice coil motor may be implemented using a “constant-current-charging-capacitor” configuration where the time needed to charge the capacitor is directly related to how far the actual motor speed is from the target speed. The BEMF voltage, indicative of motor speed, is sampled, and then stored in a storage capacitor, which is allowed to charge/discharge to a target voltage level. The time required to charge/discharge the capacitor to the target voltage is directly proportional to the difference between the BEMF voltage and the target voltage, and may be used directly as the pulse width (i.e., the charging time) in the PWM velocity control system. To avoid larger capacitors, a pulse multiplier circuit can be added, allowing charging/discharging the sampled voltage to the target voltage to be repeated by a number, N, of times.Type: GrantFiled: September 10, 2012Date of Patent: November 26, 2013Assignee: Marvell International Ltd.Inventors: Jye Sheng Hong, Siew Yong Chui
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Patent number: 8358117Abstract: In one embodiment, an apparatus includes output voltage comparison circuitry that compares an output voltage of a regulator and a reference voltage and outputs an output voltage comparison signal based on the comparison. Slope detection circuitry detects a slope of the output voltage and outputs a slope comparison signal based on the slope detected. Duty cycle determination circuitry receives the output comparison signal and the slope comparison signal and outputs a pre-driver signal having a duty cycle based on the output comparison signal and the slope comparison signal. The pre-driver signal is used to regulate the output voltage of the voltage regulator.Type: GrantFiled: May 13, 2010Date of Patent: January 22, 2013Assignee: Marvell International Ltd.Inventors: Siew Yong Chui, Rudy Kurniawan, Jye Sheng Hong
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Patent number: 8339727Abstract: The present disclosure includes systems and techniques relating to control of recording devices, such as disk drives. A described technique includes controlling a motor to actuate a head about a surface of a rotating recording medium, the motor being associated with first and second states of electric current, where a duration of the first state is longer than a duration of the second state; detecting an instance of the first state; and initiating, when the instance of the first state is detected, a switch from a first mode to a second mode to control the motor. The switch can be based on a condition of operation with respect to the rotating recording medium.Type: GrantFiled: January 12, 2012Date of Patent: December 25, 2012Assignee: Marvell International Ltd.Inventors: Jye Sheng Hong, Siew Yong Chui
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Patent number: 8283882Abstract: Analog control of the pulse width used to control the speed of a voice coil motor may be implemented using a “constant-current-charging-capacitor” configuration where the time needed to charge the capacitor is directly related to how far the actual motor speed is from the target speed. The BEMF voltage, indicative of motor speed, is sampled, and then stored in a storage capacitor, which is allowed to charge/discharge to a target voltage level. The time required to charge/discharge the capacitor to the target voltage is directly proportional to the difference between the BEMF voltage and the target voltage, and may be used directly as the pulse width (i.e., the charging time) in the PWM velocity control system. To avoid larger capacitors, a pulse multiplier circuit can be added, allowing charging/discharging the sampled voltage to the target voltage to be repeated by a number, N, of times.Type: GrantFiled: November 30, 2010Date of Patent: October 9, 2012Assignee: Marvell International Ltd.Inventors: Jye Sheng Hong, Siew Yong Chui
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Patent number: 8154889Abstract: Particular embodiments generally relate to detecting an operating mode of a flyback converter. In one embodiment, a voltage of a flyback converter is measured. A waveform for the voltage includes a first rate of change when the flyback converter is in a first mode of operation and a second rate of change when the flyback converter is in a second mode of operation. The presence of the first rate of change or the second rate of change is detected based on the waveform. The first mode of operation or the second mode of operation is determined depending on whether the first rate of change or the second rate of change is detected.Type: GrantFiled: March 23, 2010Date of Patent: April 10, 2012Assignee: Marvell International Ltd.Inventor: Jye Sheng Hong
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Patent number: 8107187Abstract: The present disclosure includes systems and techniques relating to control of recording devices, such as disk drives. Systems and techniques can include controlling a motor to actuate a head about a surface of a rotating recording medium, switching from a first mode to a second mode to control the motor based on a condition of operation with respect to the rotating recording medium, and synchronizing the switch from the first mode to the second mode based on a state of electric current associated with the motor.Type: GrantFiled: February 11, 2010Date of Patent: January 31, 2012Assignee: Marvell International Ltd.Inventors: Jye Sheng Hong, Siew Yong Chui
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Patent number: 7923954Abstract: A circuit for controlling a voice-coil motor (VCM) may incorporate a pulse-width modulation driver to drive the VCM, a zero-current detector to determine whether the current across the VCM is zero, and a Back-EMF voltage detector to measure the voltage across the VCM when the current across the VCM is determined to be zero. The circuit may determine the current velocity of the VCM and use this information to control the velocity of the VCM.Type: GrantFiled: October 1, 2009Date of Patent: April 12, 2011Assignee: Marvell International Ltd.Inventors: Siew Yong Chui, Jye Sheng Hong
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Patent number: 7924526Abstract: A method and apparatus for controlling the parking of a transducer head in a disk drive. A drive current is provided to a motor which controls movement of the head in a direction to move the head to a parking position. The arrival of the head at the parking position is detected. Upon this detection, a drive stop sequence is initiated to stop providing the drive current a short time after the head reaches the parking position. In one embodiment, it is determined whether the head has reached the parking position by monitoring the back emf (bemf) of the motor controlling the head, typically a voice coil motor (VCM). The detection of a sharp decline in the bemf indicates the head has stopped.Type: GrantFiled: November 18, 2009Date of Patent: April 12, 2011Assignee: Marvell International Ltd.Inventors: Siew Yong Chui, Edy Susanto, Jye Sheng Hong
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Patent number: 7852028Abstract: Analog control of the pulse width used to control the speed of a voice coil motor may be implemented using a “constant-current-charging-capacitor” configuration where the time needed to charge the capacitor is directly related to how far the actual motor speed is from the target speed. The BEMF voltage, indicative of motor speed, is sampled, and then stored in a storage capacitor, which is allowed to charge/discharge to a target voltage level. The time required to charge/discharge the capacitor to the target voltage is directly proportional to the difference between the BEMF voltage and the target voltage, and may be used directly as the pulse width (i.e., the charging time) in the PWM velocity control system. To avoid larger capacitors, a pulse multiplier circuit can be added, allowing charging/discharging the sampled voltage to the target voltage to be repeated by a number, N, of times.Type: GrantFiled: June 2, 2008Date of Patent: December 14, 2010Assignee: Marvell International Ltd.Inventors: Jye Sheng Hong, Siew Yong Chui
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Patent number: 7729141Abstract: A voltage tripler circuit includes a plurality of switches and first, second, and third capacitors each having first and second terminals that are selectively interconnected via the plurality of switches. The first capacitor charges to a supply voltage during a first phase. The second capacitor charges to two times the supply voltage during a second phase that follows the first phase. The third capacitor charges to three times the supply voltage during a third phase that follows the second phase. The voltage tripler circuit draws the same peak current from a source of the supply voltage at a beginning of each of the first, second, third phases.Type: GrantFiled: December 16, 2008Date of Patent: June 1, 2010Assignee: Marvell International Ltd.Inventors: Siew Yong Chui, Jye Sheng Hong
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Patent number: 7636220Abstract: A method and apparatus for controlling the parking of a transducer head in a disk drive. A drive current is provided to a motor which controls movement of the head in a direction to move the head to a parking position. The arrival of the head at the parking position is detected. Upon this detection, a drive stop sequence is initiated to stop providing the drive current a short time after the head reaches the parking position. In one embodiment, it is determined whether the head has reached the parking position by monitoring the back emf (bemf) of the motor controlling the head, typically a voice coil motor (VCM). The detection of a sharp decline in the bemf indicates the head has stopped.Type: GrantFiled: November 10, 2006Date of Patent: December 22, 2009Assignee: Marvell International Ltd.Inventors: Siew Yong Chui, Edy Susanto, Jye Sheng Hong
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Patent number: 7622880Abstract: A circuit for controlling a voice-coil motor (VCM) may incorporate a pulse-width modulation driver to drive the VCM, a zero-current detector to determine whether the current across the VCM is zero, and a Back-EMF voltage detector to measure the voltage across the VCM when the current across the VCM is determined to be zero. The circuit may determine the current velocity of the VCM and use this information to control the velocity of the VCM.Type: GrantFiled: October 11, 2007Date of Patent: November 24, 2009Assignee: Marvell International Ltd.Inventors: Siew Yong Chui, Jye Sheng Hong
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Patent number: 7466572Abstract: A three-phase voltage tripler includes first, second, and third capacitive elements and a switching module. The switching module selectively switches connections among the capacitive elements and between the capacitive elements and a reference voltage during first, second, and third periods. The switching module charges the first capacitive element to a first voltage level during the first period, the second capacitive element to a second voltage level during the second period, and the third capacitive element to a third voltage level during the third period. The third voltage level is greater than the second voltage level and the second voltage level is greater than the first voltage level.Type: GrantFiled: October 24, 2006Date of Patent: December 16, 2008Assignee: Marvell International Ltd.Inventors: Siew Yong Chui, Jye Sheng Hong