Patents by Inventor Wenchao Qu
Wenchao Qu 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: 20240004412Abstract: A low dropout regulator includes a first transistor having a first drain/source terminal coupled to an input terminal of a regulator, and a second drain/source terminal coupled to an output terminal of the regulator, a second transistor having a first drain/source terminal coupled to the input terminal of the regulator, and a second drain/source terminal coupled to the output terminal of the regulator through a resistor, and an error amplifier having an inverting input configured to receive a reference, a non-inverting input configured to detect an output voltage of the regulator, and an output coupled to gates of the first transistor and the second transistor.Type: ApplicationFiled: June 29, 2022Publication date: January 4, 2024Inventors: Gangqiang Zhang, Zhao Fang, Wenchao Qu
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Publication number: 20240006869Abstract: In some examples, this description provides for an apparatus. The apparatus includes a power switch having a power switch source configured to receive an input voltage, a power switch drain, and a power switch gate. The apparatus also includes a current sense component coupled to the power switch. The apparatus also includes a current limiting circuit coupled to the power switch gate, the power switch drain, and the current sense component. The apparatus also includes an over-current protection (OCP) circuit coupled to the power switch source, the power switch drain, and the power switch gate. The apparatus also includes an output voltage (VOUT) clamp coupled to the power switch drain and the power switch gate.Type: ApplicationFiled: September 18, 2023Publication date: January 4, 2024Inventors: Eung Jung KIM, Wenchao QU
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Patent number: 11837866Abstract: An ESD protection apparatus includes a discharge resistor and a transistor connected in series between a first voltage rail and a second voltage rail, a first coupling capacitor, a diode and a first bias resistor connected in series between the first voltage rail and the second voltage rail, wherein a common node of the diode and the first bias resistor is connected to a gate of the transistor, and an ESD protection device connected between the first voltage rail and the second voltage rail.Type: GrantFiled: June 30, 2022Date of Patent: December 5, 2023Assignee: Halo Microelectronics InternationalInventors: Zhao Fang, Gangqiang Zhang, Wenchao Qu
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Patent number: 11799281Abstract: In some examples, this description provides for an apparatus. The apparatus includes a power switch having a power switch source configured to receive an input voltage, a power switch drain, and a power switch gate. The apparatus also includes a current sense component coupled to the power switch. The apparatus also includes a current limiting circuit coupled to the power switch gate, the power switch drain, and the current sense component. The apparatus also includes an over-current protection (OCP) circuit coupled to the power switch source, the power switch drain, and the power switch gate. The apparatus also includes an output voltage (VOUT) clamp coupled to the power switch drain and the power switch gate.Type: GrantFiled: October 29, 2021Date of Patent: October 24, 2023Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Eung Jung Kim, Wenchao Qu
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Patent number: 11762407Abstract: A signal processing apparatus includes a signal processing circuit configured to process a signal obtained from a voltage bus, a high voltage circuit configured to withstand a voltage stress when a high voltage is applied to the voltage bus, and a bypass circuit configured to bypass the high voltage circuit when a low voltage is applied to the voltage bus.Type: GrantFiled: July 22, 2022Date of Patent: September 19, 2023Assignee: Halo Microelectronics InternationalInventors: Gangqiang Zhang, Zhao Fang, Wenchao Qu
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Publication number: 20230236247Abstract: In an example, a system includes a first power stage including a first power field effect transistor (FET) and a first sense transistor coupled to the first power FET. The system also includes a second power stage including a second power FET and a second sense transistor coupled to the second power FET, where the second power stage is smaller than the first power stage. The system includes a first switch coupled to a gate and a drain of the first power FET and a second switch coupled to the first power stage and the second power stage. The system also includes a sense amplifier coupled to the second switch, where the first power stage, the second power stage, and the sense amplifier are coupled to a load terminal.Type: ApplicationFiled: October 27, 2022Publication date: July 27, 2023Inventors: MD Abidur RAHMAN, Eung Jung KIM, Wenchao QU
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Publication number: 20230216292Abstract: An apparatus includes a first diode and a second diode connected in series between a first voltage terminal and a second voltage terminal, a switch connected between the first voltage terminal and the second voltage terminal, and a clamping threshold circuit connected between a common node of the first diode and the second diode, and a gate of the switch, wherein the clamping threshold circuit is configured such that in response to a voltage surge applied to the common node of the first diode and the second diode, the switch is turned on once the voltage surge is greater than a predetermined threshold.Type: ApplicationFiled: December 30, 2021Publication date: July 6, 2023Inventors: Zhao Fang, Wenchao Qu, Gangqiang Zhang
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Patent number: 11695272Abstract: An apparatus includes a first diode and a second diode connected in series between a first voltage terminal and a second voltage terminal, a switch connected between the first voltage terminal and the second voltage terminal, and a clamping threshold circuit connected between a common node of the first diode and the second diode, and a gate of the switch, wherein the clamping threshold circuit is configured such that in response to a voltage surge applied to the common node of the first diode and the second diode, the switch is turned on once the voltage surge is greater than a predetermined threshold.Type: GrantFiled: December 30, 2021Date of Patent: July 4, 2023Assignee: Halo Microelectronics InternationalInventors: Zhao Fang, Wenchao Qu, Gangqiang Zhang
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Patent number: 11595034Abstract: A load switch includes a switch input, a switch output, a first field-effect transistor (FET), and a second FET. The switch input is adapted to be coupled to a controller output of a controller. The switch output is adapted to be coupled to a controller input of the controller. The first FET has a gate and a source. The gate of the first FET is coupled to the switch input. The second FET has a gate and a source. The gate of the second FET is coupled to the source of the first FET. The source of the second FET is coupled to the switch output.Type: GrantFiled: November 30, 2021Date of Patent: February 28, 2023Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Cameron Wayne Phillips, Wenchao Qu, Tianhong Yang, Md Abidur Rahman
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Publication number: 20220385282Abstract: A load switch includes a switch input, a switch output, a first field-effect transistor (FET), and a second FET. The switch input is adapted to be coupled to a controller output of a controller. The switch output is adapted to be coupled to a controller input of the controller. The first FET has a gate and a source. The gate of the first FET is coupled to the switch input. The second FET has a gate and a source. The gate of the second FET is coupled to the source of the first FET. The source of the second FET is coupled to the switch output.Type: ApplicationFiled: November 30, 2021Publication date: December 1, 2022Inventors: Cameron Wayne PHILLIPS, Wenchao QU, Tianhong YANG, Md Abidur RAHMAN
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Publication number: 20220360068Abstract: In some examples, this description provides for an apparatus. The apparatus includes a power switch having a power switch source configured to receive an input voltage, a power switch drain, and a power switch gate. The apparatus also includes a current sense component coupled to the power switch. The apparatus also includes a current limiting circuit coupled to the power switch gate, the power switch drain, and the current sense component. The apparatus also includes an over-current protection (OCP) circuit coupled to the power switch source, the power switch drain, and the power switch gate. The apparatus also includes an output voltage (VOUT) clamp coupled to the power switch drain and the power switch gate.Type: ApplicationFiled: October 29, 2021Publication date: November 10, 2022Inventors: Eung Jung KIM, Wenchao QU
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Patent number: 9397597Abstract: Stepper motor winding current regulation methods and apparatus adapt a maximum blanking period to generate an adapted blanking period that is proportional to a currently-selected current regulation set-point. Sensed winding current feedback is ignored at a current regulation controller during the adapted blanking period or during a minimum blanking period, whichever longer, to avoid attempting to track noise imposed upon a sensed winding current feedback signal at an initiation of rapid current changes di/dt. Doing so may decrease ripple in the motor winding current waveform and reduce zero-crossing distortion by decreasing overshoot of the current regulation set-point by the sensed winding current.Type: GrantFiled: April 21, 2014Date of Patent: July 19, 2016Assignee: Texas Instruments IncorporatedInventors: Wenchao Qu, Anuj Jain, Ryan Paul Kehr
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Patent number: 9246424Abstract: Stepper motor winding current regulation methods and apparatus continuously and bi-directionally sense winding current to determine both the magnitude of the winding current and the slope of a waveform representing the winding current. The magnitude and slope information is used to more precisely control periods of current rise and characteristics of fast and slow current decay during pulse-width modulation (“PWM”) regulation cycles. Winding current rise and decay shaping is based upon the sensed magnitude of the winding current, the magnitude of the winding current regulation set-point ITRIP, whether the sensed winding current is greater than or less than ITRIP at a selected sampling time, whether the sensed winding current is increasing or decreasing when a waveform of the sensed winding current crosses over ITRIP, and whether or not the magnitude of ITRIP changes during a PWM cycle in response to a receipt of a subsequent DAC code.Type: GrantFiled: March 24, 2014Date of Patent: January 26, 2016Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Anuj Jain, Mario Marascutti, Wenchao Qu, Michael Edwin Butenhoff
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Patent number: 9112527Abstract: Input codes are sequenced at a lower-resolution linear DAC and the output is converted to a linear current waveform. A first of two interconnected analog current multipliers multiplies the linear current by itself and by the inverse of a first constant current source to create a quadratic current output. A second current multiplier multiplies the quadratic output current by the linear current and by the inverse of a second constant current source to generate a cubic current output. The quadratic and cubic currents are subtracted from the linear current to generate an approximation of the first 180 degrees of a sine wave current. Alternate (pi to 2*pi) positive-going one-half sine waves may be polarity reversed to create a complete positive-going and negative-going sine-shaped electrical current of higher resolution than is available from a sine DAC of resolution equivalent to that of the lower-resolution linear DAC.Type: GrantFiled: December 19, 2013Date of Patent: August 18, 2015Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Sudhir Nagaraj, Anuj Jain, Wenchao Qu
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Publication number: 20150028790Abstract: Stepper motor winding current regulation methods and apparatus adapt a maximum blanking period to generate an adapted blanking period that is proportional to a currently-selected current regulation set-point. Sensed winding current feedback is ignored at a current regulation controller during the adapted blanking period or during a minimum blanking period, whichever longer, to avoid attempting to track noise imposed upon a sensed winding current feedback signal at an initiation of rapid current changes di/dt. Doing so may decrease ripple in the motor winding current waveform and reduce zero-crossing distortion by decreasing overshoot of the current regulation set-point by the sensed winding current.Type: ApplicationFiled: April 21, 2014Publication date: January 29, 2015Inventors: Wenchao Qu, Anuj Jain, Ryan Paul Kehr
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Publication number: 20150015176Abstract: Input codes are sequenced at a lower-resolution linear DAC and the output is converted to a linear current waveform. A first of two interconnected analog current multipliers multiplies the linear current by itself and by the inverse of a first constant current source to create a quadratic current output. A second current multiplier multiplies the quadratic output current by the linear current and by the inverse of a second constant current source to generate a cubic current output. The quadratic and cubic currents are subtracted from the linear current to generate an approximation of the first 180 degrees of a sine wave current. Alternate (pi to 2*pi) positive-going one-half sine waves may be polarity reversed to create a complete positive-going and negative-going sine-shaped electrical current of higher resolution than is available from a sine DAC of resolution equivalent to that of the lower-resolution linear DAC.Type: ApplicationFiled: December 19, 2013Publication date: January 15, 2015Inventors: Sudhir Nagaraj, Anuj Jain, Wenchao Qu
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Publication number: 20150015177Abstract: Stepper motor winding current regulation methods and apparatus continuously and bi-directionally sense winding current to determine both the magnitude of the winding current and the slope of a waveform representing the winding current. The magnitude and slope information is used to more precisely control periods of current rise and characteristics of fast and slow current decay during pulse-width modulation (“PWM”) regulation cycles. Winding current rise and decay shaping is based upon the sensed magnitude of the winding current, the magnitude of the winding current regulation set-point ITRIP, whether the sensed winding current is greater than or less than ITRIP at a selected sampling time, whether the sensed winding current is increasing or decreasing when a waveform of the sensed winding current crosses over ITRIP, and whether or not the magnitude of ITRIP changes during a PWM cycle in response to a receipt of a subsequent DAC code.Type: ApplicationFiled: March 24, 2014Publication date: January 15, 2015Inventors: Anuj Jain, Mario Marascutti, Wenchao Qu, Michael Edwin Butenhoff
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Patent number: 8747809Abstract: The present invention is directed single diasteromers of 4-fluoroglutamine having a diastereomeric excess of at least 80%. Methods of preparing the single diastereomers are also described, as well as methods of using the single diastereomers of radiolabeled 4-fluoroglutamine as imaging agent is also described.Type: GrantFiled: August 13, 2010Date of Patent: June 10, 2014Assignee: The Trustees Of The University Of PennsylvaniaInventors: Hank F. Kung, Craig B. Thompson, Wenchao Qu, Karl Ploessl
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Publication number: 20120288444Abstract: The present invention is directed single diasteromers of 4-fluoroglutamine having a diastereomeric excess of at least 80%. Methods of preparing the single diastereomers are also described, as well as methods of using the single diastereomers of radiolabeled 4-fluoroglutamine as imaging agent is also described.Type: ApplicationFiled: August 13, 2010Publication date: November 15, 2012Applicant: THE TRUSTEES OF THE UNIVERSITY OF PENNSYLVANIAInventors: Hank F. Kung, Craig B. Thompson, Wenchao Qu, Karl Ploessl
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Publication number: 20110158907Abstract: This invention relates to a method of imaging amyloid deposits and to diphenyl-heteroaryl compounds, and methods of making radiolabeled diphenyl-heteroaryl compounds useful in imaging amyloid deposits. This invention also relates to compounds, and methods of making compounds for inhibiting the aggregation of amyloid proteins to form amyloid deposits, and a method of delivering a therapeutic agent to amyloid deposits.Type: ApplicationFiled: April 18, 2008Publication date: June 30, 2011Applicant: The Trustees of the Univeristy of PennsylvaniaInventors: Hank F. Kung, Mei-Ping Kung, Wenchao Qu