Patents by Inventor Zhijie Zhu

Zhijie Zhu 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).

  • Patent number: 10811185
    Abstract: The subject disclosure provides for utilizing pulse width modulation (PWM) signaling to influence a closed loop of a shunt boost controller and reduce an imbalance of a load. The imbalance reduction helps reduce remanence of a current transformer (CT) and thereby prevent saturation of the CT. A shunt boost controller provides the control signal to control flow of current to the load. A feedback network provides a feedback signal to the shunt boost controller based on a direct current (DC) voltage and causes a power switch circuit to turn on when a magnitude of the feedback signal exceeds a threshold magnitude. The PWM generator supplies a PWM signal to cause the control signal to be provided more symmetrical to the power switch circuit and causes the power switch circuit to turn on more frequently with the control signal to reduce the imbalance of the load.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: October 20, 2020
    Assignee: Analog Devices Global Unlimited Company
    Inventors: Liuqing Yang, Jian Ye, Zhijie Zhu
  • Publication number: 20200090861
    Abstract: The subject disclosure provides for utilizing pulse width modulation (PWM) signaling to influence a closed loop of a shunt boost controller and reduce an imbalance of a load. The imbalance reduction helps reduce remanence of a current transformer (CT) and thereby prevent saturation of the CT. A shunt boost controller provides the control signal to control flow of current to the load. A feedback network provides a feedback signal to the shunt boost controller based on a direct current (DC) voltage and causes a power switch circuit to turn on when a magnitude of the feedback signal exceeds a threshold magnitude. The PWM generator supplies a PWM signal to cause the control signal to be provided more symmetrical to the power switch circuit and causes the power switch circuit to turn on more frequently with the control signal to reduce the imbalance of the load.
    Type: Application
    Filed: September 13, 2018
    Publication date: March 19, 2020
    Inventors: Liuqing YANG, Jian YE, Zhijie ZHU
  • Publication number: 20200001540
    Abstract: Systems and techniques are described for additive manufacturing, e.g., 3D printing, a component on an unconstrained freeform build surface. The systems and techniques may allow determining a 3D trajectory and/or deformation of a target deposition region on the build surface by determining a relative location of at least one registration feature on the build surface. Control circuitry may control, based on the 3D trajectory and/or deformation and based on a build model of the component, at least one dispenser to cause dispensing of at least one composition from the at least one dispenser in a predetermined pattern on or adjacent to the target deposition region. The predetermined pattern of the composition defines at least one portion of the component.
    Type: Application
    Filed: July 2, 2019
    Publication date: January 2, 2020
    Inventors: Michael C. McAlpine, Zhijie Zhu
  • Patent number: 9866136
    Abstract: A power converter can include an electrical isolation circuit between input and output nodes. An input signal monitor node can be provided, such as on a converter output side of the isolation circuit. In an example, a peak detection circuit can be coupled to the input signal monitor node. The output node of the power converter can be configured to supply an output power signal that is a function of an input signal at the input node. The power converter can include multiple, independently-switchable switches at one or more of the input and output sides of the isolation circuit. In an example, the power converter with the input signal monitor node can be configured as a bias supply to provide power, at the output node, to a controller circuit for a main stage power converter circuit.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: January 9, 2018
    Assignee: Analog Devices Global
    Inventors: Jun Duan, Liuqing Yang, Xudong Huang, Zhijie Zhu, Renjian Xie
  • Patent number: 9577509
    Abstract: An apparatus comprises a switching circuit, an error amplifier circuit, a current threshold circuit, and an over-current detection circuit. The switching circuit provides a switching duty cycle that includes a charge portion and a discharge portion. The error amplifier circuit generates an error signal representative of a difference between a target voltage value and a voltage at an output of the voltage regulator circuit. The switching circuit adjusts the switching duty cycle to regulate the voltage at the output using the error signal and a reference waveform signal. The current threshold circuit generates an adaptive peak current limit threshold. The over-current detection circuit generates an over-current signal when the reference waveform signal satisfies the adaptive peak current limit threshold during the charging portion of the switching cycle. The switching circuit interrupts one or more switching cycles when the reference waveform signal satisfies the adaptive peak current limit threshold.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: February 21, 2017
    Assignee: Analog Devices Global
    Inventors: Basa Wang, Zhijie Zhu
  • Publication number: 20150280544
    Abstract: An apparatus comprises a switching circuit, an error amplifier circuit, a current threshold circuit, and an over-current detection circuit. The switching circuit provides a switching duty cycle that includes a charge portion and a discharge portion. The error amplifier circuit generates an error signal representative of a difference between a target voltage value and a voltage at an output of the voltage regulator circuit. The switching circuit adjusts the switching duty cycle to regulate the voltage at the output using the error signal and a reference waveform signal. The current threshold circuit generates an adaptive peak current limit threshold. The over-current detection circuit generates an over-current signal when the reference waveform signal satisfies the adaptive peak current limit threshold during the charging portion of the switching cycle. The switching circuit interrupts one or more switching cycles when the reference waveform signal satisfies the adaptive peak current limit threshold.
    Type: Application
    Filed: April 24, 2014
    Publication date: October 1, 2015
    Inventors: Basa Wang, Zhijie Zhu
  • Publication number: 20150162837
    Abstract: A power converter can include an electrical isolation circuit between input and output nodes. An input signal monitor node can be provided, such as on a converter output side of the isolation circuit. In an example, a peak detection circuit can be coupled to the input signal monitor node. The output node of the power converter can be configured to supply an output power signal that is a function of an input signal at the input node. The power converter can include multiple, independently-switchable switches at one or more of the input and output sides of the isolation circuit. In an example, the power converter with the input signal monitor node can be configured as a bias supply to provide power, at the output node, to a controller circuit for a main stage power converter circuit.
    Type: Application
    Filed: December 9, 2013
    Publication date: June 11, 2015
    Applicant: Analog Devices Technology
    Inventors: Jun Duan, Liuqing Yang, Xudong Huang, Zhijie Zhu, Renjian Xie
  • Patent number: 8928303
    Abstract: Apparatus and methods for generating a drive signal of a switching signal are disclosed. A first circuit receives an oscillating reference signal, a first compensation signal, a second compensation signal, and a third compensation signal. The first compensation signal is indicative of an error between an output voltage of a power converter and a reference voltage. The second compensation signal is indicative of the error relative to a threshold. The third compensation signal is indicative of an output current of the power converter. The first circuit generates a comparison signal having a waveform including pulses having durations based at least partly on a combination of the periodic reference signal, the first compensation signal, the second compensation signal, and the third compensation signal. A second circuit receives a clock signal and the comparison signal and generates a drive signal for activation and deactivation of a driver transistor.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 6, 2015
    Assignee: Analog Devices Technology
    Inventors: Zhijie Zhu, Junxiao Chen, Bin Shao
  • Publication number: 20140266122
    Abstract: Apparatus and methods for generating a drive signal of a switching signal are disclosed. A first circuit receives an oscillating reference signal, a first compensation signal, a second compensation signal, and a third compensation signal. The first compensation signal is indicative of an error between an output voltage of a power converter and a reference voltage. The second compensation signal is indicative of the error relative to a threshold. The third compensation signal is indicative of an output current of the power converter. The first circuit generates a comparison signal having a waveform including pulses having durations based at least partly on a combination of the periodic reference signal, the first compensation signal, the second compensation signal, and the third compensation signal. A second circuit receives a clock signal and the comparison signal and generates a drive signal for activation and deactivation of a driver transistor.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: Analog Devices Technology
    Inventors: Zhijie Zhu, Junxiao Chen, Bin Shao