Patents by Inventor Liusheng Liu
Liusheng Liu 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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Patent number: 10757774Abstract: The present disclosure provides a current adjustment circuit. The current adjustment circuit includes a lighting sub-circuit, a dimming switch disposed in the lighting sub-circuit, a switch control sub-circuit connected to the dimming switch and the lighting sub-circuit, and a time control sub-circuit connected to the switch control sub-circuit. Time of switch-off period in a switching cycle of the current adjustment circuit is adjusted under control of the time control sub-circuit and the switch control sub-circuit. Brightness of the current adjustment circuit is adjusted based on the output current of the current adjustment circuit. The present disclosure may reduce or even eliminate influence of factors such as circuit parasitic parameters on an LED light source, ensure consistency of each light source, and optimize display effect of the LED light source.Type: GrantFiled: November 25, 2019Date of Patent: August 25, 2020Assignee: MAXIC TECHNOLOGY CORPORATIONInventors: Zaixin Mu, Pan Zhang, Baohong Cheng, Liusheng Liu
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Patent number: 8836290Abstract: A monitoring circuit for accurately monitoring a voltage level from each of a plurality of battery cells of a battery pack includes an analog to digital converter (ADC) and a processor. The ADC is configured to accept an analog voltage signal from each of the plurality of battery cells and convert each analog voltage signal to a digital signal representative of an accurate voltage level of each battery cell. The processor receives such signals and provides a safety alert signal based on at least one of the signals. The ADC resolution may be adjustable. A balancing circuit provides a balancing signal if at least two of the digital signals indicate a voltage difference between two cells is greater than a battery cell balance threshold. An electronic device including such monitoring and balancing circuits is also provided. Various methods are also provided.Type: GrantFiled: August 22, 2011Date of Patent: September 16, 2014Assignee: O2MIcro International LimitedInventors: Liusheng Liu, Guoxing Li
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Patent number: 8330608Abstract: A method and apparatus are provided to indicate battery capacity status. Different blinking frequencies of an LED correspond to different battery states of charge. Furthermore, the present invention provides a smooth visual brightness change of the LED by providing the appropriate LED current according to human eye characteristics.Type: GrantFiled: October 19, 2011Date of Patent: December 11, 2012Assignee: O2Micro, Inc.Inventors: Sterling Du, Liusheng Liu, Oleksandr Kokorin
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Patent number: 8237411Abstract: A monitoring circuit for accurately monitoring a voltage level from each of a plurality of battery cells of a battery pack includes an analog to digital converter (ADC) and a processor. The ADC is configured to accept an analog voltage signal from each of the plurality of battery cells and convert each analog voltage signal to a digital signal representative of an accurate voltage level of each battery cell. The processor receives such signals and provides a safety alert signal based on at least one of the signals. The ADC resolution may be adjustable. A balancing circuit provides a balancing signal if at least two of the digital signals indicate a voltage difference between two cells is greater than a battery cell balance threshold. An electronic device including such monitoring and balancing circuits is also provided. Various methods are also provided.Type: GrantFiled: April 13, 2010Date of Patent: August 7, 2012Assignee: O2Micro International LimitedInventors: Liusheng Liu, Guoxing Li
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Patent number: 8232773Abstract: An over voltage transient controller to protect a rechargeable battery from an over voltage transient condition. The over voltage transient controller may comprise a comparator to compare a first signal with a second signal representative of a reference voltage level and to provide an output signal representative of an over voltage transient condition to a switch if the first signal is greater than or equal to the second signal. The switch is responsive to the output signal to protect the rechargeable battery from the over voltage transient condition. The over voltage transient controller may further comprise a DAC, wherein the second signal is based, at least in part, on an output of the DAC. An apparatus comprising a charge switch and such an over voltage transient controller is also provided.Type: GrantFiled: September 15, 2009Date of Patent: July 31, 2012Assignee: O2Micro, Inc.Inventors: Bruce Denning, Guoxing Li, Liusheng Liu
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Patent number: 8227944Abstract: A vertical bus circuit includes multiple devices for transmitting signals between the bus devices. The multiple devices share multiple common voltage levels. Each of the devices includes a bus block and two input/output (I/O) devices powered by a first voltage level and a second voltage level of the common voltage levels, respectively. The bus block enables signal transmission between the two I/O devices, and the common voltage levels enable the signal transmission between the devices.Type: GrantFiled: December 23, 2009Date of Patent: July 24, 2012Assignee: O2Micro IncInventors: Guoxing Li, Liusheng Liu
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Publication number: 20120038483Abstract: A method and apparatus are provided to indicate battery capacity status. Different blinking frequencies of an LED correspond to different battery states of charge. Furthermore, the present invention provides a smooth visual brightness change of the LED by providing the appropriate LED current according to human eye characteristics.Type: ApplicationFiled: October 19, 2011Publication date: February 16, 2012Applicant: O2MICRO, INC.Inventors: Sterling DU, Liusheng LIU, Oleksandr KOKORIN
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Publication number: 20110298425Abstract: A monitoring circuit for accurately monitoring a voltage level from each of a plurality of battery cells of a battery pack includes an analog to digital converter (ADC) and a processor. The ADC is configured to accept an analog voltage signal from each of the plurality of battery cells and convert each analog voltage signal to a digital signal representative of an accurate voltage level of each battery cell. The processor receives such signals and provides a safety alert signal based on at least one of the signals. The ADC resolution may be adjustable. A balancing circuit provides a balancing signal if at least two of the digital signals indicate a voltage difference between two cells is greater than a battery cell balance threshold. An electronic device including such monitoring and balancing circuits is also provided. Various methods are also provided.Type: ApplicationFiled: August 22, 2011Publication date: December 8, 2011Applicant: O2Micro International LimitedInventors: Liusheng Liu, Guoxing Li
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Patent number: 8044815Abstract: A method and apparatus are provided to indicate battery capacity status. Different blinking frequencies of an LED correspond to different battery states of charge. Furthermore, the present invention provides a smooth visual brightness change of the LED by providing the appropriate LED current according to human eye characteristics.Type: GrantFiled: March 1, 2007Date of Patent: October 25, 2011Assignee: O2Micro IncInventors: Sterling Du, Liusheng Liu, Oleksandr Kokorin
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Patent number: 8004246Abstract: A monitoring circuit for accurately monitoring a voltage level from each of a plurality of battery cells of a battery pack includes an analog to digital converter (ADC) and a processor. The ADC is configured to accept an analog voltage signal from each of the plurality of battery cells and convert each analog voltage signal to a digital signal representative of an accurate voltage level of each battery cell. The processor receives such signals and provides a safety alert signal based on at least one of the signals. The ADC resolution may be adjustable. A balancing circuit provides a balancing signal if at least two of the digital signals indicate a voltage difference between two cells is greater than a battery cell balance threshold. An electronic device including such monitoring and balancing circuits is also provided. Various methods are also provided.Type: GrantFiled: April 13, 2010Date of Patent: August 23, 2011Assignee: O2Micro International LimitedInventors: Liusheng Liu, Guoxing Li
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Patent number: 7973515Abstract: A power management system includes a battery pack having a battery controller and includes an adapter operable for charging the battery pack and powering a system load. The adapter generates a power recognition signal indicative of a maximum adapter power and receives a control signal. The battery controller in the battery pack receives the power recognition signal and generates the control signal to adjust an output power of the adapter according to a status of the battery pack and a status of the system load.Type: GrantFiled: June 12, 2008Date of Patent: July 5, 2011Assignee: O2Micro, IncInventors: William Densham, Han-Jung Kao, Liusheng Liu
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Publication number: 20110001357Abstract: A vertical bus circuit includes multiple devices for transmitting signals between the bus devices. The multiple devices share multiple common voltage levels. Each of the devices includes a bus block and two input/output (I/O) devices powered by a first voltage level and a second voltage level of the common voltage levels, respectively. The bus block enables signal transmission between the two I/O devices, and the common voltage levels enable the signal transmission between the devices.Type: ApplicationFiled: December 23, 2009Publication date: January 6, 2011Inventors: Guoxing LI, Liusheng LIU
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Patent number: 7808548Abstract: A method according to one embodiment includes coupling at least one power supply to a power bus comprised in a digital camera. The method of this embodiment may also include allocating power to at least one component of the digital camera by coupling at least one component to the power bus based on at least one power management priority rule. Of course, many alternatives, variations, and modifications are possible without departing from this embodiment.Type: GrantFiled: December 30, 2004Date of Patent: October 5, 2010Assignee: O2Micro International LimitedInventors: Vlad Popescu-Stanseti, Liusheng Liu, James Lam, Bruce S. Denning, Sterling Du
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Publication number: 20100188046Abstract: A monitoring circuit for accurately monitoring a voltage level from each of a plurality of battery cells of a battery pack includes an analog to digital converter (ADC) and a processor. The ADC is configured to accept an analog voltage signal from each of the plurality of battery cells and convert each analog voltage signal to a digital signal representative of an accurate voltage level of each battery cell. The processor receives such signals and provides a safety alert signal based on at least one of the signals. The ADC resolution may be adjustable. A balancing circuit provides a balancing signal if at least two of the digital signals indicate a voltage difference between two cells is greater than a battery cell balance threshold. An electronic device including such monitoring and balancing circuits is also provided. Various methods are also provided.Type: ApplicationFiled: April 13, 2010Publication date: July 29, 2010Inventors: Liusheng Liu, Guoxing Li
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Publication number: 20100188047Abstract: A monitoring circuit for accurately monitoring a voltage level from each of a plurality of battery cells of a battery pack includes an analog to digital converter (ADC) and a processor. The ADC is configured to accept an analog voltage signal from each of the plurality of battery cells and convert each analog voltage signal to a digital signal representative of an accurate voltage level of each battery cell. The processor receives such signals and provides a safety alert signal based on at least one of the signals. The ADC resolution may be adjustable. A balancing circuit provides a balancing signal if at least two of the digital signals indicate a voltage difference between two cells is greater than a battery cell balance threshold. An electronic device including such monitoring and balancing circuits is also provided. Various methods are also provided.Type: ApplicationFiled: April 13, 2010Publication date: July 29, 2010Inventors: Liusheng Liu, Guoxing Li
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Patent number: 7701177Abstract: A battery pre-charging circuit includes 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 is 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 the battery voltage is below a first battery voltage level.Type: GrantFiled: December 21, 2006Date of Patent: April 20, 2010Assignee: O2Micro International LimitedInventors: Shiqiang Liu, Guoxing Li, Sean Xiao, Liusheng Liu
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Patent number: 7696725Abstract: A monitoring circuit for accurately monitoring a voltage level from each of a plurality of battery cells of a battery pack includes an analog to digital converter (ADC) and a processor. The ADC is configured to accept an analog voltage signal from each of the plurality of battery cells and convert each analog voltage signal to a digital signal representative of an accurate voltage level of each battery cell. The processor receives such signals and provides a safety alert signal based on at least one of the signals. The ADC resolution may be adjustable. A balancing circuit provides a balancing signal if at least two of the digital signals indicate a voltage difference between two cells is greater than a battery cell balance threshold. An electronic device including such monitoring and balancing circuits is also provided. Various methods are also provided.Type: GrantFiled: July 24, 2006Date of Patent: April 13, 2010Assignee: O2Micro International LimitedInventors: Liusheng Liu, Guoxing Li
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Publication number: 20100007350Abstract: An over voltage transient controller to protect a rechargeable battery from an over voltage transient condition. The over voltage transient controller may comprise a comparator to compare a first signal with a second signal representative of a reference voltage level and to provide an output signal representative of an over voltage transient condition to a switch if the first signal is greater than or equal to the second signal. The switch is responsive to the output signal to protect the rechargeable battery from the over voltage transient condition. The over voltage transient controller may further comprise a DAC, wherein the second signal is based, at least in part, on an output of the DAC. An apparatus comprising a charge switch and such an over voltage transient controller is also provided.Type: ApplicationFiled: September 15, 2009Publication date: January 14, 2010Applicant: O2MICRO INTERNATIONAL LIMITEDInventors: Bruce S. Denning, Guoxing Li, Liusheng Liu
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Patent number: 7646169Abstract: Battery protection circuitry and method are disclosed. A battery is protected from a large current overdrawn condition by setting a discharge switch into a controllable conduction state. After the discharge switch is in the controllable conduction state, a tickle discharge current is gradually generated under control of a switch control signal. The trickle discharge current can be used to determine whether the large current overdrawn condition still exists. When the large current overdrawn condition is removed, the discharge switch is turned back on.Type: GrantFiled: September 29, 2006Date of Patent: January 12, 2010Assignee: O2Micro International Ltd.Inventors: Liusheng Liu, Bruce Denning
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Patent number: 7642750Abstract: 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: GrantFiled: August 22, 2006Date of Patent: January 5, 2010Assignee: O2Micro International LimitedInventors: Shiqiang Liu, Sean Xiao, Guoxing Li, Liusheng Liu