Patents by Inventor Xue Lian Zhou
Xue Lian Zhou 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: 10101762Abstract: An electronic device includes a current comparator to generate an output current based upon a difference between a current flowing in an output branch and a current flowing in an input branch. A pair of transistors is coupled to an output of the current comparator. A first amplifier has inputs coupled to the pair of transistors and to a reference voltage, the first amplifier being configured to subtract the reference voltage from a voltage across the pair of transistors and output a difference voltage. A second amplifier has inputs coupled to the difference voltage and to the reference voltage, the second amplifier being configured to subtract the difference voltage from the reference voltage and output a pulse skipping mode reference signal.Type: GrantFiled: September 13, 2017Date of Patent: October 16, 2018Assignee: STMicroelectronics (Shenzhen) R&D Co. LtdInventors: Meng Wang, Xue Lian Zhou
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Publication number: 20180004241Abstract: An electronic device includes a current comparator to generate an output current based upon a difference between a current flowing in an output branch and a current flowing in an input branch. A pair of transistors is coupled to an output of the current comparator. A first amplifier has inputs coupled to the pair of transistors and to a reference voltage, the first amplifier being configured to subtract the reference voltage from a voltage across the pair of transistors and output a difference voltage. A second amplifier has inputs coupled to the difference voltage and to the reference voltage, the second amplifier being configured to subtract the difference voltage from the reference voltage and output a pulse skipping mode reference signal.Type: ApplicationFiled: September 13, 2017Publication date: January 4, 2018Applicant: STMicroelectronics (Shenzhen) R&D Co. LtdInventors: Meng Wang, Xue Lian Zhou
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Patent number: 9857395Abstract: Current flowing through an inductor in response to a pulse width modulation (PWM) control signal is sensed to generate a sensed current. The sensed current is processed over one or more PWM cycles of the PWM control signal to generate an output signal indicative of average inductor current. This processing may include charging and discharging a capacitor at different rates dependent on the sense current, with the detection of capacitor discharge triggering a sampling of a voltage dependent on the sensed current that is indicative of average inductor current. The processing may include using the sensed to current to generate a first charge voltage associated with minimum inductor current and a second charge voltage associated with maximum inductor current, and then averaging the first and second charge voltages to generate an output signal indicative of average inductor current.Type: GrantFiled: December 1, 2015Date of Patent: January 2, 2018Assignee: STMicroelectronics (Shenzhen) R&D Co. LtdInventors: Meng Wang, Xue Lian Zhou
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Patent number: 9791883Abstract: An electronic device disclosed herein includes a current comparator to generate an output current based upon a difference between a current flowing in an output branch and a current flowing in an input branch. A pair of transistors is coupled to an output of the current comparator. A first amplifier has inputs coupled to the pair of transistors and to a reference voltage, the first amplifier being configured to subtract the reference voltage from a voltage across the pair of transistors and output a difference voltage. A second amplifier has inputs coupled to the difference voltage and to the reference voltage, the second amplifier being configured to subtract the difference voltage from the reference voltage and output a pulse skipping mode reference signal.Type: GrantFiled: July 25, 2016Date of Patent: October 17, 2017Assignee: STMicroelectronics (Shenzhen) R&D Co. LtdInventors: Meng Wang, Xue Lian Zhou
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Publication number: 20170149328Abstract: A charge pump circuit is coupled between a positive supply node and a ground node. The charge pump circuit operates in response to clock signals output from a clock generator to produce a negative voltage at a negative voltage output node. A soft-start circuit for the charge pump circuit includes a comparison circuit configured to compare a varying intermediate voltage sensed between a rising supply voltage and the negative voltage to a ramp voltage during a start-up period of the charge pump circuit. The clock generator is selectively enabled to generate the clock signals in response to the comparison to provide for pulse-skipping.Type: ApplicationFiled: December 1, 2015Publication date: May 25, 2017Applicant: STMicroelectronics (Shenzhen) R&D Co. LtdInventors: Meng Wang, Xue Lian Zhou
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Publication number: 20170146571Abstract: Current flowing through an inductor in response to a pulse width modulation (PWM) control signal is sensed to generate a sensed current. The sensed current is processed over one or more PWM cycles of the PWM control signal to generate an output signal indicative of average inductor current. This processing may include charging and discharging a capacitor at different rates dependent on the sense current, with the detection of capacitor discharge triggering a sampling of a voltage dependent on the sensed current that is indicative of average inductor current. The processing may include using the sensed to current to generate a first charge voltage associated with minimum inductor current and a second charge voltage associated with maximum inductor current, and then averaging the first and second charge voltages to generate an output signal indicative of average inductor current.Type: ApplicationFiled: December 1, 2015Publication date: May 25, 2017Applicant: STMicroelectronics (Shenzhen) R&D Co. LtdInventors: Meng Wang, Xue Lian Zhou
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Patent number: 9653990Abstract: A charge pump circuit is coupled between a positive supply node and a ground node. The charge pump circuit operates in response to clock signals output from a clock generator to produce a negative voltage at a negative voltage output node. A soft-start circuit for the charge pump circuit includes a comparison circuit configured to compare a varying intermediate voltage sensed between a rising supply voltage and the negative voltage to a ramp voltage during a start-up period of the charge pump circuit. The clock generator is selectively enabled to generate the clock signals in response to the comparison to provide for pulse-skipping.Type: GrantFiled: December 1, 2015Date of Patent: May 16, 2017Assignee: STMicroelectronics (Shenzhen) R&D Co. LtdInventors: Meng Wang, Xue Lian Zhou
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Publication number: 20160334828Abstract: An electronic device disclosed herein includes a current comparator to generate an output current based upon a difference between a current flowing in an output branch and a current flowing in an input branch. A pair of transistors is coupled to an output of the current comparator. A first amplifier has inputs coupled to the pair of transistors and to a reference voltage, the first amplifier being configured to subtract the reference voltage from a voltage across the pair of transistors and output a difference voltage. A second amplifier has inputs coupled to the difference voltage and to the reference voltage, the second amplifier being configured to subtract the difference voltage from the reference voltage and output a pulse skipping mode reference signal.Type: ApplicationFiled: July 25, 2016Publication date: November 17, 2016Applicant: STMicroelectronics (Shenzhen) R&D Co. LtdInventors: Meng Wang, Xue Lian Zhou
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Patent number: 9423816Abstract: An electronic device may include a switching converter configured to convert an input voltage to an output voltage, and being selectively operable in a pulse skipping mode based upon a control signal. The switching converter may include a comparator having a first input configured to receive an error signal, a second input configured to receive a skipping mode reference signal, and an output configured to generate the control signal. A reference generator may be configured to generate the skipping mode reference signal as a function of a difference between the output voltage and the input voltage.Type: GrantFiled: November 3, 2014Date of Patent: August 23, 2016Assignee: STMICROELECTRONICS (SHENZHEN) R&D CO. LTDInventors: Meng Wang, Xue Lian Zhou
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Patent number: 9323273Abstract: A current source circuit is configured to receive a reference current at the input circuit path of a current mirror circuit. The current mirror circuit mirrors the reference current and generates mirror currents at a number of output circuit paths. A corresponding number of control transistors are connected in series with the output circuit paths. Each control transistor is selectively actuated in response to a control signal. A decoder circuit is configured to receive a variable control signal and generate actuation signals in response thereto to selective actuate the control transistors to pass the mirror current to an output node. At the output node, the passed mirror currents are summed to generate a variable output current. The variable current is monotonically modulated in response to the variable control signal.Type: GrantFiled: October 2, 2014Date of Patent: April 26, 2016Assignee: STMICROELECTRONICS (SHENZHEN) R&D CO. LTDInventors: Meng Wang, Xue Lian Zhou
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Publication number: 20160103463Abstract: An electronic device may include a switching converter configured to convert an input voltage to an output voltage, and being selectively operable in a pulse skipping mode based upon a control signal. The switching converter may include a comparator having a first input configured to receive an error signal, a second input configured to receive a skipping mode reference signal, and an output configured to generate the control signal. A reference generator may be configured to generate the skipping mode reference signal as a function of a difference between the output voltage and the input voltage.Type: ApplicationFiled: November 3, 2014Publication date: April 14, 2016Applicant: STMICROELECTRONICS (SHENZHEN) R&D CO. LTDInventors: Meng Wang, Xue Lian Zhou
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Publication number: 20160062384Abstract: A current source circuit is configured to receive a reference current at the input circuit path of a current mirror circuit. The current mirror circuit mirrors the reference current and generates mirror currents at a number of output circuit paths. A corresponding number of control transistors are connected in series with the output circuit paths. Each control transistor is selectively actuated in response to a control signal. A decoder circuit is configured to receive a variable control signal and generate actuation signals in response thereto to selective actuate the control transistors to pass the mirror current to an output node. At the output node, the passed mirror currents are summed to generate a variable output current. The variable current is monotonically modulated in response to the variable control signal.Type: ApplicationFiled: October 2, 2014Publication date: March 3, 2016Applicant: STMICROELECTRONICS (SHENZHEN) R&D CO. LTDInventors: Meng Wang, Xue Lian Zhou