Patents by Inventor Chutao Zhang
Chutao 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).
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Publication number: 20220173604Abstract: A method includes detecting a voltage of the battery, detecting a current of the battery, determining a depth of discharge of the battery based on the voltage and the current of the battery, and controlling terminating charging of the battery responsive to the determined depth of discharge of the battery reaching a depth of discharge threshold. A system includes a battery gauge circuit and a processor coupled to the battery gauge circuit. The battery gauge circuit has a voltage sense input and a current sense input and is configured to determine a depth of discharge of a battery based on a battery voltage at the voltage sense input and a battery current at the current sense input. The processor is configured to control terminating charging of the battery responsive to the determined depth of discharge reaching a depth of discharge threshold.Type: ApplicationFiled: May 27, 2021Publication date: June 2, 2022Applicant: Texas Instruments IncorporatedInventor: Chutao Zhang
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Patent number: 8957625Abstract: A method for balancing multiple battery cells which are grouped into multiple battery modules includes: obtaining cell parameters of the battery cells, respectively; calculating an average cell parameter for each of the battery modules according to the cell parameters; identifying a donator module and a receiver module from the battery modules based upon the average cell parameter; and transferring energy from the donator module to the receiver module to balance the battery cells.Type: GrantFiled: December 13, 2012Date of Patent: February 17, 2015Assignee: O2Micro, Inc.Inventors: Guoxing Li, Wei Zhang, Songtao Chen, Chutao Zhang
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Patent number: 8405358Abstract: A charging path includes a charging switch for transferring a charging current from an input terminal to an output terminal. The charging path further includes a first enable terminal coupled to the charging switch. The first enable terminal receives a first enable signal to control the charging switch to operate in either a first mode, a second mode, or a third mode, based on a status of the output terminal. More specifically, in the first mode, the charging switch is fully turned off. In the second mode, an equivalent resistance of the charging switch is determined by a control terminal of the charging switch. In the third mode, the charging switch is turned off.Type: GrantFiled: August 26, 2009Date of Patent: March 26, 2013Assignee: O2Micro Inc.Inventors: Guoxing Li, Ruichao Tang, Chutao Zhang
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Patent number: 8344694Abstract: A battery circuit including a first battery cell with a first parameter having a first value and a second battery cell with a second parameter having a second value. The second battery cell is coupled to the first battery cell in series. The battery circuit further includes a magnetic device operable for storing energy transferred from the first battery cell via a first winding coupled to the first battery cell and for releasing the stored energy to the second battery cell via a second winding coupled to the second battery cell if the first value of the first parameter is greater than the second value of the second parameter.Type: GrantFiled: April 12, 2012Date of Patent: January 1, 2013Assignee: O2Micro International, Ltd.Inventors: Chutao Zhang, Songtao Chen
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Patent number: 8339100Abstract: A method for balancing multiple battery cells which are grouped into multiple battery modules includes: obtaining cell parameters of the battery cells, respectively; calculating an average cell parameter for each of the battery modules according to the cell parameters; identifying a donator module and a receiver module from the battery modules based upon the average cell parameter; and transferring energy from the donator module to the receiver module to balance the battery cells.Type: GrantFiled: May 4, 2011Date of Patent: December 25, 2012Assignee: O2Micro IncInventors: Guoxing Li, Wei Zhang, Songtao Chen, Chutao Zhang
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Publication number: 20120196159Abstract: A battery circuit including a first battery cell with a first parameter having a first value and a second battery cell with a second parameter having a second value. The second battery cell is coupled to the first battery cell in series. The battery circuit further includes a magnetic device operable for storing energy transferred from the first battery cell via a first winding coupled to the first battery cell and for releasing the stored energy to the second battery cell via a second winding coupled to the second battery cell if the first value of the first parameter is greater than the second value of the second parameter.Type: ApplicationFiled: April 12, 2012Publication date: August 2, 2012Applicant: O2MICRO INC.Inventors: Chutao Zhang, Songtao Chen
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Publication number: 20120161717Abstract: A circuit for charging a battery pack includes a transformer and a charger controller. The transformer is operable for receiving an input power and for providing a charging power according to a driving signal to charge the battery pack. The charger controller is operable for monitoring a status of the battery pack, for selecting a charging mode from multiple charging modes according to the status, and for generating the driving signal according to the charging mode to adjust the charging power. The charger controller further executes a state machine that stores data indicating predetermined battery statuses that cause saturation of the transformer, and that selects a protection mode in which said charging power is restricted if the status of the battery pack matches to one of the predetermined battery statuses.Type: ApplicationFiled: March 6, 2012Publication date: June 28, 2012Inventors: Guo Xing LI, Jiankui GUO, Xin DONG, Songtao CHEN, Ruichao TANG, Chutao ZHANG, Celin HE
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Patent number: 8164305Abstract: The present invention provides a battery circuit including a first battery cell with a first parameter having a first value and a second battery cell with a second parameter having a second value. The second battery cell is coupled to the first battery cell in series. The battery circuit further includes a magnetic device operable for storing energy transferred from the first battery cell via a first winding coupled to the first battery cell and for releasing the stored energy to the second battery cell via a second winding coupled to the second battery cell if the first value of the first parameter is greater than the second value of the second parameter.Type: GrantFiled: September 27, 2010Date of Patent: April 24, 2012Assignee: O2Micro International, Ltd.Inventors: Chutao Zhang, Songtao Chen
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Publication number: 20110241622Abstract: A method for balancing multiple battery cells which are grouped into multiple battery modules includes: obtaining cell parameters of the battery cells, respectively; calculating an average cell parameter for each of the battery modules according to the cell parameters; identifying a donator module and a receiver module from the battery modules based upon the average cell parameter; and transferring energy from the donator module to the receiver module to balance the battery cells.Type: ApplicationFiled: May 4, 2011Publication date: October 6, 2011Applicant: O2MICRO, INC.Inventors: Guoxing LI, Wei ZHANG, Songtao CHEN, Chutao ZHANG
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Publication number: 20110076525Abstract: The present invention provides a battery circuit including a first battery cell with a first parameter having a first value and a second battery cell with a second parameter having a second value. The second battery cell is coupled to the first battery cell in series. The battery circuit further includes a magnetic device operable for storing energy transferred from the first battery cell via a first winding coupled to the first battery cell and for releasing the stored energy to the second battery cell via a second winding coupled to the second battery cell if the first value of the first parameter is greater than the second value of the second parameter.Type: ApplicationFiled: September 27, 2010Publication date: March 31, 2011Applicant: O2MICRO INC.Inventors: Chutao ZHANG, Songtao CHEN
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Publication number: 20100231174Abstract: A circuit for charging a battery pack includes a power converter and a charger controller. The power converter is operable for receiving an input power, and for providing a charging power for charging the battery pack. The power converter provides galvanic isolation between input circuitry and output circuitry of the circuit. The input circuitry shares a first ground potential with the input power, and the output circuitry shares a second ground potential with the charging power. The charger controller in the input circuitry includes a modulator for generating a driving signal to drive the power converter and control the charging power.Type: ApplicationFiled: March 12, 2009Publication date: September 16, 2010Inventors: Guo Xing LI, Jiankui GUO, Xin DONG, Songtao CHEN, Ruichao TANG, Chutao ZHANG, Celin HE
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Publication number: 20100052624Abstract: A charging path includes a charging switch for transferring a charging current from an input terminal to an output terminal. The charging path further includes a first enable terminal coupled to the charging switch. The first enable terminal receives a first enable signal to control the charging switch to operate in either a first mode, a second mode, or a third mode, based on a status of the output terminal. More specifically, in the first mode, the charging switch is fully turned off. In the second mode, an equivalent resistance of the charging switch is determined by a control terminal of the charging switch. In the third mode, the charging switch is turned off.Type: ApplicationFiled: August 26, 2009Publication date: March 4, 2010Inventors: Guoxing LI, Ruichao TANG, Chutao ZHANG