Patents by Inventor Liqiang Zhu

Liqiang 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).

  • Publication number: 20170214328
    Abstract: Systems and methods are provided for signal processing. An example error amplifier for processing a reference signal and an input signal associated with a current of a power conversion system includes a first operational amplifier, a second operational amplifier, a first transistor, a second transistor, a current mirror component, a switch, a first resistor and a second resistor. The first operational amplifier includes a first input terminal, a second input terminal and a first output terminal, the first input terminal being configured to receive a reference signal. The first transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal, the first transistor terminal being configured to receive a first amplified signal from the first output terminal, the third transistor terminal being coupled to the second input terminal.
    Type: Application
    Filed: February 9, 2017
    Publication date: July 27, 2017
    Inventors: Liqiang Zhu, JIQING YANG, YAOZHANG CHEN, ZHUOYAN LI, QIANG LUO, LIEYI FANG
  • Publication number: 20170214327
    Abstract: Systems and methods are provided for signal processing. An example error amplifier for processing a reference signal and an input signal associated with a current of a power conversion system includes a first operational amplifier, a second operational amplifier, a first transistor, a second transistor, a current mirror component, a switch, a first resistor and a second resistor. The first operational amplifier includes a first input terminal, a second input terminal and a first output terminal, the first input terminal being configured to receive a reference signal. The first transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal, the first transistor terminal being configured to receive a first amplified signal from the first output terminal, the third transistor terminal being coupled to the second input terminal.
    Type: Application
    Filed: February 9, 2017
    Publication date: July 27, 2017
    Inventors: Liqiang Zhu, JIQING YANG, YAOZHANG CHEN, ZHUOYAN LI, QIANG LUO, LIEYI FANG
  • Patent number: 9712065
    Abstract: System and method for regulating a power conversion system. An example system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first transistor terminal of a first transistor, the first transistor further including a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to a primary winding of a power conversion system, a second controller terminal associated with a second controller voltage and coupled to the third transistor terminal, and a third controller terminal associated with a third controller voltage. The first controller voltage is equal to a sum of the third controller voltage and a first voltage difference. The second controller voltage is equal to a sum of the third controller voltage and a second voltage difference.
    Type: Grant
    Filed: May 20, 2015
    Date of Patent: July 18, 2017
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Jiqing Yang, Jun Zhou, Liqiang Zhu, Qiang Luo, Lieyi Fang
  • Publication number: 20170196063
    Abstract: Systems and methods for dimming control using TRIAC dimmers are provided. An example apparatus for a power conversion system includes: a process-and-drive component configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system. The input signal includes a first pulse associated with a first input period and a second pulse associated with a second input period. The drive signal is associated with a first modulation period for the first input period and a second modulation period for the second input period. The process-and-drive component is further configured to: determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period.
    Type: Application
    Filed: January 11, 2017
    Publication date: July 6, 2017
    Inventors: LIQIANG ZHU, JIQING YANG, ZHUOYAN LI, LIEYI FANG
  • Publication number: 20170181235
    Abstract: System and method for dimming control. The system includes a system controller, a transistor, and a resistor. The system controller includes a first controller terminal and a second controller terminal. The transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal. The resistor including a first resistor terminal and a second resistor terminal. The first transistor terminal is coupled, directly or indirectly, to the second controller terminal. The first resistor terminal is coupled to the second transistor terminal. The second resistor terminal is coupled to the third transistor terminal. The system controller is configured to receive an input signal at the first controller terminal and to generate an output signal at the second controller terminal. The transistor is configured to receive the output signal at the first transistor terminal and to change between a first condition and a second condition.
    Type: Application
    Filed: December 7, 2016
    Publication date: June 22, 2017
    Inventors: Liqiang Zhu, Jun ZHOU, Lieyi FANG
  • Patent number: 9614445
    Abstract: Systems and methods are provided for signal processing. An example error amplifier for processing a reference signal and an input signal associated with a current of a power conversion system includes a first operational amplifier, a second operational amplifier, a first transistor, a second transistor, a current mirror component, a switch, a first resistor and a second resistor. The first operational amplifier includes a first input terminal, a second input terminal and a first output terminal, the first input terminal being configured to receive a reference signal. The first transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal, the first transistor terminal being configured to receive a first amplified signal from the first output terminal, the third transistor terminal being coupled to the second input terminal.
    Type: Grant
    Filed: August 16, 2013
    Date of Patent: April 4, 2017
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jiqing Yang, Yaozhang Chen, Zhuoyan Li, Qiang Luo, Lieyi Fang
  • Publication number: 20170079097
    Abstract: Systems and methods are provided herein for current regulation. An example system controller includes: a first controller terminal configured to receive an input voltage, the first controller terminal being further configured to allow a first current flowing into the system controller based at least in part on the input voltage in response to one or more switches being closed; a second controller terminal configured to allow the first current to flow out of the system controller through the second controller terminal in response to the one or more switches being closed; a fourth controller terminal coupled to the third controller terminal through a first capacitor, the first capacitor not being any part of the system controller; and an error amplifier configured to generate a compensation signal based at least in part on the current sensing signal, the error amplifier including a second capacitor.
    Type: Application
    Filed: October 29, 2015
    Publication date: March 16, 2017
    Inventors: Meng Li, Mingli Kang, Liqiang Zhu, Lieyi Fang
  • Publication number: 20170079104
    Abstract: Systems and methods are provided herein for current regulation. An example system controller includes: a first controller terminal configured to receive an input voltage, the first controller terminal being further configured to allow a first current flowing into the system controller based at least in part on the input voltage in response to one or more switches being closed; a second controller terminal configured to allow the first current to flow out of the system controller through the second controller terminal in response to the one or more switches being closed; a fourth controller terminal coupled to the third controller terminal through a first capacitor, the first capacitor not being any part of the system controller; and an error amplifier configured to generate a compensation signal based at least in part on the current sensing signal, the error amplifier including a second capacitor.
    Type: Application
    Filed: February 11, 2016
    Publication date: March 16, 2017
    Inventors: Meng Li, MingIi Kang, Liqiang Zhu, Lieyi Fang
  • Patent number: 9585222
    Abstract: Systems and methods for dimming control using TRIAC dimmers are provided. An example apparatus for a power conversion system includes: a process-and-drive component configured to receive an input signal and output a drive signal to a switch to affect a current that flows through a primary winding of a power conversion system. The input signal includes a first pulse associated with a first input period and a second pulse associated with a second input period. The drive signal is associated with a first modulation period for the first input period and a second modulation period for the second input period. The process-and-drive component is further configured to: determine the first modulation period for the first input period; change the drive signal between a first logic level and a second logic level at a modulation frequency during the first modulation period; determine the second modulation period for the second input period.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: February 28, 2017
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jiqing Yang, Zhuoyan Li, Lieyi Fang
  • Patent number: 9554432
    Abstract: System and method for dimming control. The system includes a system controller, a transistor, and a resistor. The system controller includes a first controller terminal and a second controller terminal. The transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal. The resistor including a first resistor terminal and a second resistor terminal. The first transistor terminal is coupled, directly or indirectly, to the second controller terminal. The first resistor terminal is coupled to the second transistor terminal. The second resistor terminal is coupled to the third transistor terminal. The system controller is configured to receive an input signal at the first controller terminal and to generate an output signal at the second controller terminal. The transistor is configured to receive the output signal at the first transistor terminal and to change between a first condition and a second condition.
    Type: Grant
    Filed: August 5, 2015
    Date of Patent: January 24, 2017
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jun Zhou, Lieyi Fang
  • Patent number: 9501635
    Abstract: This disclosure describes methods, systems, and application programming interfaces for creating a credential managed account. This disclosure describes creating a new password managed account, defining the password managed account, wherein the password managed account is to access a service on a managed computing device, identifying the password managed account for a lifecycle, and automatically managing the password managed account by updating and changing a password for the password managed account on a periodic basis.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: November 22, 2016
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Ramesh Chinta, Scott A. Field, Liqiang Zhu, Umit Akkus, Siddharth Bhai, Gopinathan Kannan, James J Simmons, Qi Cao, Paul Miller, Ryan Fairfax, Alexandru Hanganu
  • Publication number: 20160338165
    Abstract: Systems and methods are provided for regulating one or more currents. An example system controller includes: a thermal detector configured to detect a temperature associated with the system controller and generate a thermal detection signal based at least in part on the detected temperature; and a modulation-and-driver component configured to receive the thermal detection signal and generate a drive signal based at least in part on the thermal detection signal to close or open a switch to affect a drive current associated with one or more light emitting diodes. The modulation-and-driver component is further configured to, in response to the detected temperature increasing from a first temperature threshold but remaining smaller than a second temperature threshold, generate the drive signal to keep the drive current at a first current magnitude, the second temperature threshold being higher than the first temperature threshold.
    Type: Application
    Filed: June 18, 2015
    Publication date: November 17, 2016
    Inventors: Xiangkun Zhai, Liqiang Zhu, Qiang Luo
  • Publication number: 20160338163
    Abstract: System and method for dimming control of one or more light emitting diodes. An example system includes one or more signal processing components configured to receive a first signal associated with a TRIAC dimmer, process information associated with the first signal, determine whether the TRIAC dimmer is in a first condition or a second condition, generate a second signal based on at least information associated with the first signal, and send the second signal to a switch. The one or more signal processing components are further configured to, if the TRIAC dimmer is determined to be in the first condition, generate the second signal to cause the switch to be opened and closed corresponding to a modulation frequency.
    Type: Application
    Filed: May 18, 2016
    Publication date: November 17, 2016
    Inventors: Liqiang Zhu, Jun Zhou, Yongsheng Su, Lieyi Fang
  • Publication number: 20160277411
    Abstract: Tenant approval for operator access to tenant data is provided. In order to grant service personnel operators access to a tenant's data for performing a requested action, a lockbox determines a security group role to which an operator needs to be elevated to perform a requested action, computes a set of internal administrators and tenant administrators authorized to grant a temporary role elevation, and sends an access control request to the administrators. Upon receiving approval of the access control request from an internal administrator and a tenant administrator, the lockbox elevates the operator to the security group role, granting the operator a set of permissions needed in order to allow the operator to perform the requested action. Accordingly, tenants are enabled to control access to their data and scrutinize access requests per their company procedures and compliance needs.
    Type: Application
    Filed: March 19, 2015
    Publication date: September 22, 2016
    Applicant: Microsoft Technology Licensing, LLC.
    Inventors: Rajalakshmi Dani, Anand Madhava Menon, Paul H. Rich, Naveen Madan, Vikas Ahuja, Siddhartha Mathur, Liqiang Zhu
  • Patent number: 9426850
    Abstract: System and method are provided for generating a plurality of channel currents. The system includes a channel reference generator configured to receive a first reference current and generate at least a first channel driving current and a second channel driving current, a first channel current divider configured to receive the first channel driving current and generate a first input current, a second input current, and a third input current, a second channel current divider configured to receive the second channel driving current and generate a fourth input current, a fifth input current, and a sixth input current, a first channel driver configured to receive the first input current, the second input current, and the third input current and generate a first channel current, and a second channel driver configured to receive the fourth input current, the fifth input current, and the sixth input current and generate a second channel current.
    Type: Grant
    Filed: February 26, 2015
    Date of Patent: August 23, 2016
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Jiqing Yang, Meng Li, Liqiang Zhu, Lieyi Fang
  • Patent number: 9408269
    Abstract: System and method for dimming control of one or more light emitting diodes. An example system includes one or more signal processing components configured to receive a first signal associated with a TRIAC dimmer, process information associated with the first signal, determine whether the TRIAC dimmer is in a first condition or a second condition, generate a second signal based on at least information associated with the first signal, and send the second signal to a switch. The one or more signal processing components are further configured to, if the TRIAC dimmer is determined to be in the first condition, generate the second signal to cause the switch to be opened and closed corresponding to a modulation frequency.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: August 2, 2016
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jun Zhou, Yongsheng Su, Lieyi Fang
  • Publication number: 20160182487
    Abstract: When a user inputs an action request, such as a requested command, to be performed on a target machine, a management system receives the request and verifies it with a separate authentication and permission system. The authentication and permission system verifies signatures on the request and signs it and generates an approved workflow package. The approved workflow package is sent to the target machine.
    Type: Application
    Filed: December 16, 2015
    Publication date: June 23, 2016
    Inventors: Liqiang Zhu, Rajalakshmi Dani
  • Publication number: 20160182525
    Abstract: When a user inputs an action request, such as a requested command, to be performed on a target machine, a management system receives the request and verifies it with a separate authentication and permission system. The verified command request is sent to the target machine. An authentication worker on the target machine accesses a set of policies, local to the target machine, to identify a least privileged execution environment in which the requested command can be performed. The authentication worker on the target machine launches the requested command within the identified least privileged execution environment on the target machine.
    Type: Application
    Filed: May 18, 2015
    Publication date: June 23, 2016
    Inventors: Liqiang Zhu, Anand Menon, Guanghui He, Jiahui Wang, Neil Shipp, Nick Voicu, Yi Zeng, Yu (Kyle) Huang, Rajalakshmi Dani, David Hetherington, Zhaoan Liu, Gavin Ackroyd
  • Patent number: 9301349
    Abstract: System and method for dimming control. The system includes a system controller, a transistor, and a resistor. The system controller includes a first controller terminal and a second controller terminal. The transistor includes a first transistor terminal, a second transistor terminal and a third transistor terminal. The resistor including a first resistor terminal and a second resistor terminal. The first transistor terminal is coupled, directly or indirectly, to the second controller terminal. The first resistor terminal is coupled to the second transistor terminal. The second resistor terminal is coupled to the third transistor terminal. The system controller is configured to receive an input signal at the first controller terminal and to generate an output signal at the second controller terminal. The transistor is configured to receive the output signal at the first transistor terminal and to change between a first condition and a second condition.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: March 29, 2016
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Jun Zhou, Lieyi Fang
  • Patent number: 9257964
    Abstract: Oscillator system and method thereof. The oscillator system includes a first voltage-to-current converter configured to receive a first voltage and generate a first current based on at least information associated with the first voltage, and a second voltage-to-current converter configured to receive a second voltage and generate a second current based on at least information associated with the second voltage. Additionally, the oscillator system further includes a current-mode N-bit digital-to-analog converter configured to receive at least the second current and a first clock signal and to generate a third current based on at least information associated with the second current and the first clock signal. N is a first integer. The first clock signal is associated with a first clock frequency corresponding to a first clock period. Moreover, the oscillator system further includes a current comparator coupled to the first voltage-to-current converter and the current-mode N-bit digital-to-analog converter.
    Type: Grant
    Filed: November 20, 2013
    Date of Patent: February 9, 2016
    Assignee: On-Bright Electronics (Shanghai) Co., Ltd.
    Inventors: Liqiang Zhu, Lieyi Fang