Patents by Inventor Qianwen Zhang

Qianwen Zhang 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: 11909388
    Abstract: A terminal resistance circuit, a chip and a chip communication device are provided. The terminal resistance circuit can be used for a high-speed differential I/O pair and includes two resistance circuits and a control circuit. An end of the two resistance circuits connected in series is connected to a first interface and another end is connected to a second interface. A conductor wire connected between the two resistance circuits has a target node thereon. The two resistance circuits are symmetrically arranged relative to the target node. The control circuit is connected to the two resistance circuits individually and used to control the two resistance circuits each to be in a turn-off state during powering-on of the chip. An abnormal operation caused by a short circuit between two interfaces of a I/O pair during the powering-on of the chip is avoided and the working stability of the chip is improved.
    Type: Grant
    Filed: April 29, 2022
    Date of Patent: February 20, 2024
    Assignee: SHENZHEN PANGO MICROSYSTEMS CO., LTD
    Inventors: Qianwen Zhang, Aimei Liang, Changqing Wen, Qiwei Wang
  • Publication number: 20230344435
    Abstract: Provided are a digital-to-analog conversion circuit and method. The digital-to-analog conversion circuit includes a conversion unit and a first regulating unit. The conversion unit includes a first code value receiving terminal used to receive a first code value, and the conversion unit is used to convert the first code value into an analog signal. The first regulating unit includes a second code value receiving terminal used to receive a second code value. A signal input terminal of the first regulating unit is connected to a signal output terminal of the conversion unit. The first regulating unit is used to acquire a first analog regulation signal according to the second code value, and regulate, by using the first analog regulation signal, an analog signal transmitted by the conversion unit.
    Type: Application
    Filed: June 29, 2023
    Publication date: October 26, 2023
    Inventors: LI YANG, QIANWEN ZHANG, CHANGQING WEN, AIMEI LIANG
  • Publication number: 20220286128
    Abstract: A terminal resistance circuit, a chip and a chip communication device are provided. The terminal resistance circuit can be used for a high-speed differential I/O pair and includes two resistance circuits and a control circuit. An end of the two resistance circuits connected in series is connected to a first interface and another end is connected to a second interface. A conductor wire connected between the two resistance circuits has a target node thereon. The two resistance circuits are symmetrically arranged relative to the target node. The control circuit is connected to the two resistance circuits individually and used to control the two resistance circuits each to be in a turn-off state during powering-on of the chip. An abnormal operation caused by a short circuit between two interfaces of a I/O pair during the powering-on of the chip is avoided and the working stability of the chip is improved.
    Type: Application
    Filed: April 29, 2022
    Publication date: September 8, 2022
    Inventors: QIANWEN ZHANG, AIMEI LIANG, CHANGQING WEN, QIWEI WANG
  • Patent number: 10685272
    Abstract: An oscillation maintenance circuit with comparator-based pulse generation is provided. By sampling an RF signal and controlling a pulse generation circuit to generate a pulse signal of the same frequency as the RF signal, a switch unit is controlled to be ON/OFF at a same frequency as the RF signal, achieving synchronization between change of the current injection and the RF signal. Thus, the oscillation frequency is not affected by current injection, ensuring the FSK communication performance. At the same time, two comparators are respectively compared with two reference voltage levels to obtain an output pulse signal, and the reference voltage levels can be adjusted according to practical requirements, so that the switch-on point of time and current injection time duration are adjustable, maximizing the efficiency of current injection, resulting in simple circuit structure, low power consumption, and increased communication distance of an HDX passive RFID transponder.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: June 16, 2020
    Assignee: EXCELIO TECHNOLOGY (SHENZHEN) CO., LTD.
    Inventors: Qianwen Zhang, Patrick Bian Wu, Fuqiang Han
  • Patent number: 10552723
    Abstract: A half-duplex RFID oscillation maintenance circuit with trigger-based pulse generation is provided, including: a resonance inductor and a resonance capacitor forming an L-C resonance circuit coupled to an external radio frequency field to generate alternating current for a rectifier circuit, which is connected to an energy-storage capacitor. A first antenna end is connected to a trigger circuit through a switch unit and a resistor connected in series; and an output end of the trigger circuit is connected to a control end of the switch unit. The trigger circuit is configured to sample an oscillation signal at the first antenna end to generate a rectangular wave signal, whose pulse width can be self-adaptively adjusted, to control OFF/ON of the switch unit and, when the switch unit is ON, to form a current injection loop from the energy-storage capacitor to the L-C resonance circuit.
    Type: Grant
    Filed: October 10, 2017
    Date of Patent: February 4, 2020
    Assignee: EXCELIO TECHNOLOGY (SHENZHEN) CO., LTD.
    Inventors: Qianwen Zhang, Patrick Bian Wu, Fuqiang Han
  • Publication number: 20190286966
    Abstract: A half-duplex RFID oscillation maintenance circuit with trigger-based pulse generation is provided, including: a resonance inductor and a resonance capacitor forming an L-C resonance circuit coupled to an external radio frequency field to generate alternating current for a rectifier circuit, which is connected to an energy-storage capacitor. A first antenna end is connected to a trigger circuit through a switch unit and a resistor connected in series; and an output end of the trigger circuit is connected to a control end of the switch unit. The trigger circuit is configured to sample an oscillation signal at the first antenna end to generate a rectangular wave signal, whose pulse width can be self-adaptively adjusted, to control OFF/ON of the switch unit and, when the switch unit is ON, to form a current injection loop from the energy-storage capacitor to the L-C resonance circuit.
    Type: Application
    Filed: October 10, 2017
    Publication date: September 19, 2019
    Inventors: Qianwen ZHANG, Patrick Bian WU, Fuqiang HAN
  • Publication number: 20190236426
    Abstract: An oscillation maintenance circuit with comparator-based pulse generation is provided. By sampling an RF signal and controlling a pulse generation circuit to generate a pulse signal of the same frequency as the RF signal, a switch unit is controlled to be ON/OFF at a same frequency as the RF signal, achieving synchronization between change of the current injection and the RF signal. Thus, the oscillation frequency is not affected by current injection, ensuring the FSK communication performance. At the same time, two comparators are respectively compared with two reference voltage levels to obtain an output pulse signal, and the reference voltage levels can be adjusted according to practical requirements, so that the switch-on point of time and current injection time duration are adjustable, maximizing the efficiency of current injection, resulting in simple circuit structure, low power consumption, and increased communication distance of an HDX passive RFID transponder.
    Type: Application
    Filed: October 10, 2017
    Publication date: August 1, 2019
    Inventors: Qianwen ZHANG, Patrick Bian WU, Fuqiang HAN
  • Publication number: 20110028307
    Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd- and/or Pt-based catalyst component and a USY-type zeolite. By using the catalyst, a hydrocarbon containing propane or butane as a main component, i.e. a liquefied petroleum gas, can be produced with high activity, high selectivity and high yield from at least one of methanol and dimethyl ether.
    Type: Application
    Filed: October 12, 2010
    Publication date: February 3, 2011
    Applicant: JAPAN GAS SYNTHESIZE, LTD.
    Inventors: Kaoru FUJIMOTO, Kenji ASAMI, Xiaohong LI, Qianwen ZHANG
  • Patent number: 7834230
    Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd- and/or Pt-based catalyst component and a USY-type zeolite. By using the catalyst, a hydrocarbon containing propane or butane as a main component, i.e. a liquefied petroleum gas, can be produced with high activity, high selectivity and high yield from at least one of methanol and dimethyl ether.
    Type: Grant
    Filed: August 18, 2006
    Date of Patent: November 16, 2010
    Assignee: Japan Gas Synthesized, Ltd.
    Inventors: Kaoru Fujimoto, Kenji Asami, Xiaohong Li, Qianwen Zhang
  • Publication number: 20090042717
    Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd-based methanol synthesis catalyst component and a ?-zeolite catalyst component. It can be used in a reaction of carbon monoxide and hydrogen to give a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas, with high activity, high selectivity and high yield. Furthermore, the catalyst has a longer catalyst life with less deterioration.
    Type: Application
    Filed: October 11, 2007
    Publication date: February 12, 2009
    Applicant: Japan Gas Synthesize, Ltd.
    Inventors: Kaoru Fujimoto, Kenji Asami, Sachio Asaoka, Xiaohong Li, Qianwen Zhang
  • Publication number: 20080319245
    Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a methanol synthesis catalyst component in which an olefin-hydrogenation catalyst component is supported on a Zn—Cr-based methanol synthesis catalyst, and a zeolite catalyst component. It can be used in a reaction of carbon monoxide and hydrogen to give a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas, with high activity, high selectivity and high yield. Furthermore, the catalyst has a longer catalyst life with less deterioration.
    Type: Application
    Filed: May 30, 2005
    Publication date: December 25, 2008
    Inventors: Kaoru Fujimoto, Kenji Asami, Xiaohong Li, Sachio Asaoka, Qianwen Zhang
  • Publication number: 20070277552
    Abstract: A hydrocarbon gas containing propane or butane as a main component, i.e., a liquefied petroleum gas is produced by passing a raw material gas comprising at least one selected from the group consisting of methanol and dimethyl ether, and a synthesis gas through a catalyst layer comprising a catalyst for producing a liquefied petroleum gas.
    Type: Application
    Filed: February 9, 2007
    Publication date: December 6, 2007
    Inventors: Kaoru FUJIMOTO, Kenji ASAMI, Xiaohong LI, Qianwen ZHANG
  • Publication number: 20070282019
    Abstract: Crude methanol or crude dimethyl ether containing carbon monoxide and/or carbon dioxide is produced from the synthesis gas, which is produced from a carbon-containing starting material such as a natural gas, and then a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas is produced from the crude methanol or the crude dimethyl ether.
    Type: Application
    Filed: February 9, 2007
    Publication date: December 6, 2007
    Inventors: Kaoru FUJIMOTO, Kenji ASAMI, Xiaohong LI, Qianwen ZHANG
  • Patent number: 7297825
    Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd-based methanol synthesis catalyst component and a ?-zeolite catalyst component. It can be used in a reaction of carbon monoxide and hydrogen to give a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas, with high activity, high selectivity and high yield. Furthermore, the catalyst has a longer catalyst life with less deterioration.
    Type: Grant
    Filed: August 30, 2004
    Date of Patent: November 20, 2007
    Assignee: Japan Gas Synthesize, Ltd.
    Inventors: Kaoru Fujimoto, Kenji Asami, Sachio Asaoka, Xiaohong Li, Qianwen Zhang
  • Publication number: 20070106106
    Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd— and/or Pt-based catalyst component and a USY-type zeolite. By using the catalyst, a hydrocarbon containing propane or butane as a main component, i.e. a liquefied petroleum gas, can be produced with high activity, high selectivity and high yield from at least one of methanol and dimethyl ether.
    Type: Application
    Filed: August 18, 2006
    Publication date: May 10, 2007
    Inventors: Kaoru FUJIMOTO, Kenji ASAMI, Xiaohong LI, Qianwen ZHANG
  • Publication number: 20060009349
    Abstract: A catalyst for producing a liquefied petroleum gas according to the present invention comprises a Pd-based methanol synthesis catalyst component and a ?-zeolite catalyst component. It can be used in a reaction of carbon monoxide and hydrogen to give a hydrocarbon containing propane or butane as a main component, i.e., a liquefied petroleum gas, with high activity, high selectivity and high yield. Furthermore, the catalyst has a longer catalyst life with less deterioration.
    Type: Application
    Filed: August 30, 2004
    Publication date: January 12, 2006
    Inventors: Kaoru Fujimoto, Kenji Asami, Sachio Asaoka, Xiaohong Li, Qianwen Zhang
  • Patent number: 6797669
    Abstract: A catalyst for selective hydrogenation of alkynes and dienes, its preparation process and application. The catalyst has an inorganic oxide support, a major active component palladium, and a Group IB metal promoter. The active components are uniformly distributed in the catalyst body within the thickness between the support surface and the depth of more than 300 &mgr;m. The catalyst of the present invention has high activity, high selectivity, ability to resist sulfur and arsenic poisoning. The catalyst is particularly applicable to C2-C3 fraction with any concentrations of hydrogen and CO.
    Type: Grant
    Filed: December 27, 2001
    Date of Patent: September 28, 2004
    Assignees: China Petroleum & Chemical Corporation, Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation
    Inventors: Qianwen Zhang, Han Zhang
  • Publication number: 20020165092
    Abstract: The present invention relates to a catalyst for selective hydrogenation of alkynes and dienes, its preparation process and application. The catalyst has an inorganic oxide support, a major active component palladium, and a Group IB metal promoter. The active components are uniformly distributed in the catalyst body within the thickness between the support surface and the depth of more than 300 &mgr;m. The catalyst of the present invention has high activity, high selectivity, ability to resist sulfur and arsenic poisoning. The catalyst is particularly applicable to C2-C3 fraction with any concentrations of hydrogen and CO.
    Type: Application
    Filed: December 27, 2001
    Publication date: November 7, 2002
    Inventors: Qianwen Zhang, Han Zhang
  • Patent number: D768944
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: October 11, 2016
    Assignees: JIANGSU MIDEA CLEANING APPLIANCES CO., LTD., MIDEA GROUP CO., LTD.
    Inventor: Qianwen Zhang