Patents by Inventor Sean Xiao
Sean Xiao 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: 20080315855Abstract: A voltage generator is used for generating a voltage reference with high power supply rejection. One embodiment of the circuit includes a voltage regulator and a bandgap voltage circuit and an amplifier. The voltage regulator including an input node is coupled to an external power supply for generating a regulated voltage source. A bandgap voltage circuit includes a first and a second resistor and a first and a second transistor to generate a voltage difference between the base-to-emitter voltages of the first and the second transistors. The second resistor is coupled to the first resistor and the first transistor for generating the first predetermined voltage in response to the voltage difference. An amplifier circuit is coupled to the first transistor of the bandgap voltage circuit for receiving a first amplifying signal and generating an amplified signal so as to regulate the regulated voltage source.Type: ApplicationFiled: June 19, 2007Publication date: December 25, 2008Inventors: Sean Xiao, Tom Tang, Guoxing Li
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Patent number: 7466104Abstract: A system and method for cell balancing with smart low-voltage control circuit. The cell balancing system comprises a plurality of battery cells, an external bypass path for each cell, an internal bypass path for each cell, an input terminal receiving an enable signal for each cell, an input terminal receiving a selection signal, and a cell balancing unit for generating a configuration signal to conduct the external bypass path or internal bypass path. The enable signal is configured to enable a bypass current of each cell, and the selection signal is configured to select the external bypass path or internal bypass path. The cell balancing unit is employed to receive signals from input terminals, and generate a configuration signal to control the conductance of external bypass paths or internal bypass paths.Type: GrantFiled: October 13, 2006Date of Patent: December 16, 2008Assignee: O2 Micro International LimitedInventors: Wei Wang, Guoxing Li, Sean Xiao
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Publication number: 20080150487Abstract: A battery pre-charging circuit. The pre-charging circuit comprises a pre-charging path, a pre-charging switch and a low-voltage pre-charging circuit. The pre-charging path is coupled between a charger and a battery for providing a pre-charging current from the charger to the battery. The pre-charging switch is coupled to the pre-charging path for conducting along the pre-charging path. The low-voltage pre-charging circuit coupled to the pre-charging switch for controlling the pre-charging switch. The low-voltage pre-charging circuit is configured to switch on the pre-charging switch when a battery voltage over the battery is below a first battery voltage level.Type: ApplicationFiled: December 21, 2006Publication date: June 26, 2008Inventors: Shiqiang Liu, Guoxing Li, Sean Xiao, Liusheng Liu
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Patent number: 7388200Abstract: A sensing method includes exposing a nano-transducer having a controlled surface to a sample including at least one species. Adsorption of the species on the nano-transducer is transduced to a measurable signal as a function of time. Desorption of the species from the nano-transducer is also transduced to a measurable signal as a function of time. A residence time of the at least one species adsorbed on the nano-transducer is extracted from the measurable signals. The adsorption and desorption each define an individual measurable event.Type: GrantFiled: October 19, 2006Date of Patent: June 17, 2008Assignee: Hewlett-Packard Development Company, L.P.Inventors: Duncan R. Stewart, William M. Tong, R. Stanley Williams, Philip J. Kuekes, Sean Xiao-an Zhang, Kevin F. Peters, Kenneth J. Ward
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Publication number: 20080116490Abstract: A sensing method includes exposing a nano-transducer having a controlled surface to a sample including at least one species. Adsorption of the species on the nano-transducer is transduced to a measurable signal as a function of time. Desorption of the species from the nano-transducer is also transduced to a measurable signal as a function of time. A residence time of the at least one species adsorbed on the nano-transducer is extracted from the measurable signals. The adsorption and desorption each define an individual measurable event.Type: ApplicationFiled: October 19, 2006Publication date: May 22, 2008Inventors: Duncan R. Stewart, William M. Tong, R. Stanley Williams, Philip J. Kuekes, Sean Xiao-an Zhang, Kevin F. Peters, Kenneth J. Ward
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Publication number: 20080100564Abstract: An electronically addressable display comprises a substrate, at least one polarization-type, electrical field switchable molecular colorant associated with the substrate, and an addressing device mounted for selectively switching the at least one molecular colorant between at least two visually distinguishable states. Electronic devices including the electronically addressable displays and methods of manufacturing the electronically addressable display are also disclosed.Type: ApplicationFiled: October 26, 2006Publication date: May 1, 2008Inventors: Kent D. Vincent, Sean Xiao-An Zhang, Zhang-Lin Zhou
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Publication number: 20080088277Abstract: A system and method for cell balancing with smart low-voltage control circuit. The cell balancing system comprises a plurality of battery cells, an external bypass path for each cell, an internal bypass path for each cell, an input terminal receiving an enable signal for each cell, an input terminal receiving a selection signal, and a cell balancing unit for generating a configuration signal to conduct the external bypass path or internal bypass path. The enable signal is configured to enable a bypass current of each cell, and the selection signal is configured to select the external bypass path or internal bypass path. The cell balancing unit is employed to receive signals from input terminals, and generate a configuration signal to control the conductance of external bypass paths or internal bypass paths.Type: ApplicationFiled: October 13, 2006Publication date: April 17, 2008Inventors: Wei Wang, Guoxing Li, Sean Xiao
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Patent number: 7345302Abstract: The invention described herein includes a molecular switch, comprising: a donor subunit; an acceptor subunit; and an aromatic bridging subunit comprising one or more bridging groups for bonding the donor subunit to the aromatic bridging subunit and for bonding the acceptor subunit to the aromatic bridging subunit wherein the aromatic bridging subunit is conformable in a manner effective for polarizing and de-polarizing the molecular switch at a low electric field voltage.Type: GrantFiled: September 21, 2004Date of Patent: March 18, 2008Assignee: Hewlett-Packard Development Company, L.P.Inventors: Sean Xiao-An Zhang, Kent Vincent, Zhang-Lin Zhou, R. Stanley Williams
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Publication number: 20080022927Abstract: A microfluidic device for controllably moving a material of interest includes a holding cavity configured to hold the material of interest and at least one actuator configured to induce an activation material to expand or contract. Expansion of the activation material decreases the size of the holding cavity to cause the material of interest to be released from the holding cavity and contraction of the activation material increases the size of the holding cavity to cause the material of interest to be received into the holding cavity. The at least one actuator is operable at multiple levels between a zero induction level to a maximum induction level on the activation material to thereby controllably expand or contract the holding cavity to release or receive a specified volume of the material of interest.Type: ApplicationFiled: July 28, 2006Publication date: January 31, 2008Inventors: Sean Xiao-An Zhang, Patricia A. Beck, Janice H. Nickel
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Patent number: 7294526Abstract: An optical sensor is provided, comprising (a) a silicon nanowire of finite length having an electrical contact pad at each end thereof; and (b) a plurality of self-assembled molecules on a surface of the silicon nanowire, the molecules serving to modulate electrical conductivity of the silicon nanowire by either a reversible change in dipole moment of the molecules or by a reversible molecule-assisted electron/energy transfer from the molecules onto the silicon nanowire. Further, a method of making the optical sensor is provided. The concept of molecular self-assembly is applied in attaching functional molecules onto silicon nanowire surfaces, and the requirement of molecule modification (hydroxy group in molecules) is minimal from the point view of synthetic difficulty and compatibility. Self-assembly will produce well-ordered ultra-thin films with strong chemical bonding on a surface that cannot be easily achieved by other conventional methods.Type: GrantFiled: August 12, 2004Date of Patent: November 13, 2007Assignee: Hewlett-Packard Development Company, L.P.Inventors: Zhiyong Li, Yong Chen, Sean Xiao-An Zhang
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Publication number: 20070257642Abstract: A monitoring circuit for monitoring a plurality of battery cells of a battery pack includes a plurality of temperature sensors, an analog to digital converter (ADC) and a processor. The plurality of temperature sensors is used for sensing temperatures of the plurality of battery cells and outputting a plurality of analog temperature voltage signals representative of the temperature of the plurality of battery cells. The analog to digital converter (ADC) is adapted to receive the plurality of analog temperature voltage signals and to convert each of the plurality of analog temperature voltage signals to a plurality of individual digital signals. The processor is adapted to generate an alert signal when an individual digital signal is not within a predetermined range.Type: ApplicationFiled: April 24, 2007Publication date: November 8, 2007Inventors: Sean Xiao, Kevin Sheng, Guoxing Li, Liusheng Liu
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Publication number: 20070188950Abstract: A protection device for non-common ground buses is disclosed. The protection circuit includes a controller, a level shifter, a first group of switches, and a second group of switches. The controller together with the level shifter controls the first group and second group of switches. The non-common ground buses will be isolated when at least one group of the switches are turned off in an abnormal condition.Type: ApplicationFiled: December 27, 2006Publication date: August 16, 2007Inventors: Liusheng Liu, Guoxing Li, Shiqiang Liu, Sean Xiao
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Publication number: 20070075684Abstract: A circuit is used for controlling charging and discharging a battery. The circuit comprises a first MOSFET for controlling discharging the battery, and a second MOSFET coupled in series to the battery and the first MOSFET for controlling charging the battery. The first and second MOSFETs have body diodes respectively, and the first body diode of the first MOSFET and the second body diode of the second MOSFET are coupled in opposite directions. A load is coupled to the battery and a common node between the first and second MOSFETs such that power in the battery is delivered to said load when the first MOSFET is turned on. The circuit further comprises a power source coupled to the second switch in series and power is delivered from the power source to the battery when the first and second MOSFETs are turned on.Type: ApplicationFiled: August 22, 2006Publication date: April 5, 2007Inventors: Shiqiang Liu, Sean Xiao, Guoxing Li, Liusheng Liu
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Publication number: 20060176019Abstract: A communication circuit is used for transmitting data between a plurality of devices which have non-common ground voltages. The communication circuit comprises a plurality of transmitting input nodes coupled to the devices, respectively, a transmitting current path, a plurality of receiving output nodes coupled to the devices, respectively, and a receiving current path. The transmitting current path is coupled to the transmitting input nodes. The current through the transmitting current path is varied according to the input signal of the transmitting input nodes. The receiving current path is coupled to the receiving output nodes. The current through the receiving current path is varied according to the current of the transmitting current path such that data is transmitted from the transmitting input nodes to the receiving output nodes.Type: ApplicationFiled: November 18, 2005Publication date: August 10, 2006Inventors: Sean Xiao, Oleksandr Kokorin
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Patent number: 6995312Abstract: A bistable molecular switch can have a highly conjugated first state and a less conjugated second state. The bistable molecular switch can be configured such that application of an electric field reversibly switches the molecular switch from the first state to the second state. Additionally, the bistable molecular switch can include a hydrophobic moiety and a hydrophilic moiety. Such molecular switches can be incorporated into a thin film as part of a molecular switch system which can include a layer of molecular switches between a first electrode layer and a second electrode layer. The layer of molecular switches can have substantially all of the molecular switches having their hydrophilic moiety oriented in the same direction. An electric potential can then be induced between the first and second electrode layers sufficient to switch the molecular switches from the first or second state to the second or first state, respectively.Type: GrantFiled: February 24, 2004Date of Patent: February 7, 2006Assignee: Hewlett-Packard Development Company, L.P.Inventors: Zhang-Lin Zhou, Sean Xiao-An Zhang
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Patent number: 6951672Abstract: Ceramic pigment-based, chemically-modified porous coatings can be used for enhancing image permanence of ink-jet image printing. Specifically, a porous coated media sheet, comprising a media substrate, having a porous coating coated thereon comprising a modified ceramic pigment including a fixer group and a stabilizer group, each covalently attached to the ceramic pigment is disclosed. Additionally, a method and system for preparing permanent ink-jet images is also provided.Type: GrantFiled: July 30, 2003Date of Patent: October 4, 2005Assignee: Hewlett-Packard Development Company, L.P.Inventors: Kent D. Vincent, Sivapackia Ganapathiappan, Sean Xiao-An Zhang, Palitha Wickramanayake
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Patent number: 6867427Abstract: Molecular systems are provided for electric field activated switches, such as optical switches. The molecular system has an electric field induced band gap change that occurs via one of the following mechanisms: (1) molecular conformation change; (2) change of extended conjugation via chemical bonding change to change the band gap; or (3) molecular folding or stretching. Nanometer-scale reversible optical switches are thus provided that can be assembled easily to make a variety of optical devices, including optical displays.Type: GrantFiled: July 10, 2003Date of Patent: March 15, 2005Assignee: Hewlett-Packard Development Company, LP.Inventors: Sean Xiao-An Zhang, R. Stanley Williams, Kent D. Vincent
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Patent number: 6815706Abstract: An optical sensor is provided, comprising (a) a silicon nanowire of finite length having an electrical contact pad at each end thereof; and (b) a plurality of self-assembled molecules on a surface of the silicon nanowire, the molecules serving to modulate electrical conductivity of the silicon nanowire by either a reversible change in dipole moment of the molecules or by a reversible molecule-assisted electron/energy transfer from the molecules onto the silicon nanowire. Further, a method of making the optical sensor is provided. The concept of molecular self-assembly is applied in attaching functional molecules onto silicon nanowire surfaces, and the requirement of molecule modification (hydroxy group in molecules) is minimal from the point view of synthetic difficulty and compatibility. Self-assembly will produce well-ordered ultra-thin films with strong chemical bonding on a surface that cannot be easily achieved by other conventional methods.Type: GrantFiled: December 17, 2002Date of Patent: November 9, 2004Assignee: Hewlett-Packard Development Company, L.P.Inventors: Zhiyong Li, Yong Chen, Sean Xiao-An Zhang
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Publication number: 20040165806Abstract: A bistable molecular switch can have a highly conjugated first state and a less conjugated second state. The bistable molecular switch can be configured such that application of an electric field reversibly switches the molecular switch from the first state to the second state. Additionally, the bistable molecular switch can include a hydrophobic moiety and a hydrophilic moiety. Such molecular switches can be incorporated into a thin film as part of a molecular switch system which can include a layer of molecular switches between a first electrode layer and a second electrode layer. The layer of molecular switches can have substantially all of the molecular switches having their hydrophilic moiety oriented in the same direction. An electric potential can then be induced between the first and second electrode layers sufficient to switch the molecular switches from the first or second state to the second or first state, respectively.Type: ApplicationFiled: February 24, 2004Publication date: August 26, 2004Inventors: Zhang-Lin Zhou, Sean Xiao-An Zhang
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Publication number: 20040113165Abstract: An optical sensor is provided, comprising (a) a silicon nanowire of finite length having an electrical contact pad at each end thereof; and (b) a plurality of self-assembled molecules on a surface of the silicon nanowire, the molecules serving to modulate electrical conductivity of the silicon nanowire by either a reversible change in dipole moment of the molecules or by a reversible molecule-assisted electron/energy transfer from the molecules onto the silicon nanowire. Further, a method of making the optical sensor is provided. The concept of molecular self-assembly is applied in attaching functional molecules onto silicon nanowire surfaces, and the requirement of molecule modification (hydroxy group in molecules) is minimal from the point view of synthetic difficulty and compatibility. Self-assembly will produce well-ordered ultra-thin films with strong chemical bonding on a surface that cannot be easily achieved by other conventional methods.Type: ApplicationFiled: December 17, 2002Publication date: June 17, 2004Inventors: Zhiyong Li, Yong Chen, Sean Xiao-An Zhang