Patents by Inventor Alexandru Hartular
Alexandru Hartular 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: 9018917Abstract: A driving circuit for an N-channel Metal Oxide Semiconductor (NMOS) transistor can include a charge pump unit and a driver coupled to the charge pump. The charge pump can receive a source voltage and output an output voltage higher than the source voltage, where the source voltage is applied to a source terminal of the NMOS transistor. The driver receives the output voltage of the charge pump unit and converts the output voltage to a driving voltage operable for conducting the NMOS transistor.Type: GrantFiled: April 29, 2013Date of Patent: April 28, 2015Assignee: O2Micro, Inc.Inventors: Marian Niculae, Alexandru Hartular, Dan Simion, Guoying Yi
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Patent number: 8975875Abstract: A power management system includes a first switch, a second switch, and a controller coupled to the first and second switches. The first switch has a first transfer terminal. The second switch has a second transfer terminal. The controller controls power conversion by turning on a third switch periodically. The first and second transfer terminals and a third transfer terminal of the third switch are coupled to a common node. The resistance between the first transfer terminal and the common node, the resistance between the second transfer terminal and the common node, and the resistance between the third transfer terminal and the common node are substantially equal to zero.Type: GrantFiled: December 11, 2012Date of Patent: March 10, 2015Assignee: 02Micro, Inc.Inventors: Eftimie Caraghiorghiopol, Laszlo Lipcsei, Alexandru Hartular, Marian Niculae
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Patent number: 8450977Abstract: A driving circuit for an N-channel Metal Oxide Semiconductor (NMOS) transistor can include a charge pump unit and a driver coupled to the charge pump. The charge pump can receive a source voltage and output an output voltage higher than the source voltage, where the source voltage is applied to a source terminal of the NMOS transistor. The driver receives the output voltage of the charge pump unit and converts the output voltage to a driving voltage operable for conducting the NMOS transistor.Type: GrantFiled: December 17, 2008Date of Patent: May 28, 2013Assignee: O2Micro, Inc.Inventors: Marian Niculae, Alexandru Hartular, Dan Simion, Guoying Yi
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Patent number: 8350532Abstract: A power management system includes a first switch, a second switch, and a controller coupled to the first and second switches. The first switch has a first transfer terminal. The second switch has a second transfer terminal. The controller controls power conversion by turning on a third switch periodically. The first and second transfer terminals and a third transfer terminal of the third switch are coupled to a common node. The resistance between the first transfer terminal and the common node, the resistance between the second transfer terminal and the common node, and the resistance between the third transfer terminal and the common node are substantially equal to zero.Type: GrantFiled: March 7, 2011Date of Patent: January 8, 2013Assignee: O2Micro Inc.Inventors: Eftimie Caraghiorghiopol, Laszlo Lipcsei, Alexandru Hartular, Marian Niculae
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Patent number: 7999516Abstract: Circuits and methods for battery charging are disclosed. In one embodiment, the battery charging circuit comprises an AC to DC converter, a charging control switch, and a charger controller. The AC to DC converter provides a charging power to a battery pack. The charging control switch is coupled between the AC to DC converter and the battery pack. The charging control switch transfers the charging power to the battery pack. The charger controller detects a battery status of the battery pack and controls the charging control switch to charge the battery pack in a continuous charging mode or a pulse charging mode according to the battery status. The charger controller also controls the AC to DC converter to regulate the charging power according to the battery status.Type: GrantFiled: June 28, 2010Date of Patent: August 16, 2011Assignee: 02Micro International LimitedInventors: Alexandru Hartular, Eftimie Caraghiorghiopol, Dan Simon
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Patent number: 7994660Abstract: A supply topology comprising an AC to DC or DC to DC adapter and an electronic device with an active system, a battery, and an adapter controller implements closed-loop control of adapter output voltage to limit power consumption by the electronic device to a value related to maximum adapter power. The adapter adjusts its output voltage in response to the magnitude of an error signal representing an amount by which instantaneous power consumption exceeds adapter maximum power. An adapter controller in the electronic device sets a limit for allocating current to battery charging from the signal representing maximum adapter power, with battery charging current approaching zero as instantaneous power consumption approaches maximum adapter power.Type: GrantFiled: November 23, 2009Date of Patent: August 9, 2011Assignee: 02Micro International LimitedInventors: Doru Cioaca, Constantin Bucur, Alexandru Hartular, Marian Niculae
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Publication number: 20110156483Abstract: A power management system includes a first switch, a second switch, and a controller coupled to the first and second switches. The first switch has a first transfer terminal. The second switch has a second transfer terminal. The controller controls power conversion by turning on a third switch periodically. The first and second transfer terminals and a third transfer terminal of the third switch are coupled to a common node. The resistance between the first transfer terminal and the common node, the resistance between the second transfer terminal and the common node, and the resistance between the third transfer terminal and the common node are substantially equal to zero.Type: ApplicationFiled: March 7, 2011Publication date: June 30, 2011Inventors: Eftimie CARAGHIORGHIOPOL, Laszlo LIPCSEI, Alexandru HARTULAR, Marian NICULAE
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Publication number: 20110121653Abstract: A system may include an electronic device configured to consume a supply current; an AC to DC adapter configured to be coupled to the electronic device, wherein the AC to DC adapter has a maximum rated output current; a battery configured to be coupled to the electronic device; DC to DC converter configured to be coupled to the battery and the electronic device; and a controller configured to couple the AC to DC adapter to the electronic device, the controller further configured to couple the DC to DC converter to the battery and the electronic device when the supply current exceeds the maximum rated output current of the AC to DC adapter.Type: ApplicationFiled: May 18, 2010Publication date: May 26, 2011Applicant: O2MICRO INTERNATIONAL LIMITEDInventors: Alexandru Hartular, Laszlo Lipcsei, Marian Niculae, Constantin Spiridon
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Publication number: 20100264882Abstract: Circuits and methods for battery charging are disclosed. In one embodiment, the battery charging circuit comprises an AC to DC converter, a charging control switch, and a charger controller. The AC to DC converter provides a charging power to a battery pack. The charging control switch is coupled between the AC to DC converter and the battery pack. The charging control switch transfers the charging power to the battery pack. The charger controller detects a battery status of the battery pack and controls the charging control switch to charge the battery pack in a continuous charging mode or a pulse charging mode according to the battery status. The charger controller also controls the AC to DC converter to regulate the charging power according to the battery status.Type: ApplicationFiled: June 28, 2010Publication date: October 21, 2010Applicant: O2MICRO, INC.Inventors: Alexandru Hartular, Eftimie Caraghiorghiopol, Dan Simion
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Patent number: 7719236Abstract: A portable electrical device may include a DC to DC converter coupled to a common node, a load coupled to the common node, and a controller configured to control the DC to DC converter. The DC to DC converter may be configured to provide a charging current to a rechargeable battery from an adapter when the controller operates said DC to DC converter in a first adapter supply mode. The DC to DC converter may be configured to provide a battery supply current to the load via the common node when the controller operates the DC to DC converter in a second adapter supply mode. The adapter supply current and the battery supply current may add together at the common node to simultaneously provide a load supply current to the load in the second adapter supply mode.Type: GrantFiled: November 18, 2005Date of Patent: May 18, 2010Assignee: O2Micro International LimitedInventor: Alexandru Hartular
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Publication number: 20100066318Abstract: A supply topology comprising an AC to DC or DC to DC adapter and an electronic device with an active system, a battery, and an adapter controller implements closed-loop control of adapter output voltage to limit power consumption by the electronic device to a value related to maximum adapter power. The adapter couples a signal representing maximum adapter power to a control line connected to the electronic device and the electronic device couples an error signal representing the difference between instantaneous power consumption and adapter maximum power onto the same control line. The adapter adjusts its output voltage in response to the magnitude of the error signal. An adapter controller in the electronic device sets a limit for allocating current to battery charging from the signal representing maximum adapter power, with battery charging current approaching zero as instantaneous power consumption approaches maximum adapter power.Type: ApplicationFiled: November 23, 2009Publication date: March 18, 2010Inventors: Doru CIOACA, Constantin BUCUR, Alexandru HARTULAR, Marian NICULAE
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Patent number: 7622830Abstract: A supply topology comprising an AC to DC or DC to DC adapter and an electronic device with an active system, a battery, and an adapter controller implements closed-loop control of adapter output voltage to limit power consumption by the electronic device to a value related to maximum adapter power. The adapter couples a signal representing maximum adapter power to a control line connected to the electronic device and the electronic device couples an error signal representing the difference between instantaneous power consumption and adapter maximum power onto the same control line. The adapter adjusts its output voltage in response to the magnitude of the error signal. An adapter controller in the electronic device sets a limit for allocating current to battery charging from the signal representing maximum adapter power, with battery charging current approaching zero as instantaneous power consumption approaches maximum adapter power.Type: GrantFiled: September 13, 2006Date of Patent: November 24, 2009Assignee: O2Micro International LimitedInventors: Doru Cioaca, Constantin Bucur, Alexandru Hartular, Marian Niculae
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Patent number: 7592777Abstract: A current mode charger controller for controlling a DC to DC converter. The current mode charger may include a first error amplifier having an output coupled to a common node. The first error amplifier may be configured to compare a first signal representative of a charging current provided to a rechargeable battery with a maximum charging current and provide a current control signal in response to the comparison. The current mode charger controller may further include an internal compensation network coupled to the common node, and a comparator configured to compare an inductor current signal representative of an inductor current through an inductor of the DC to DC converter with a compensation signal. The need for any external compensation for the current mode charger controller may be eliminated.Type: GrantFiled: November 18, 2005Date of Patent: September 22, 2009Assignee: O2Micro International LimitedInventors: Chun Lu, You-Yuh Shyr, Alexandru Hartular, Constantin Bucur
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Publication number: 20090160500Abstract: A driving circuit for an N-channel Metal Oxide Semiconductor (NMOS) transistor can include a charge pump unit and a driver coupled to the charge pump. The charge pump can receive a source voltage and output an output voltage higher than the source voltage, where the source voltage is applied to a source terminal of the NMOS transistor. The driver receives the output voltage of the charge pump unit and converts the output voltage to a driving voltage operable for conducting the NMOS transistor.Type: ApplicationFiled: December 17, 2008Publication date: June 25, 2009Inventors: Marian Niculae, Alexandru Hartular, Dan Simion, Guoying Yi
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Patent number: 7508176Abstract: A controller for a DC to DC converter. The controller may comprise linear mode circuitry and switch mode control circuitry. The linear mode control circuitry may be capable of providing a first control signal to a controlled device of the DC to DC converter. The controlled device may operate as a variable resistor in response to the first control signal to control an output voltage of the DC to DC converter. The switch mode control circuitry may be capable of providing a second control signal to the controlled device of the DC to DC converter. The controlled device may turn ON and OFF in response to the second control signal to control the output voltage of the DC to DC converter. One of the linear mode control circuitry and the switch mode control circuitry may be enabled. The controller may also include protection circuitry.Type: GrantFiled: October 13, 2005Date of Patent: March 24, 2009Assignee: O2Micro International LimitedInventors: Alexandru Hartular, Chun Lu, You-Yuh Shyr, Constantin Bucur, Vlad Mihail Popescu-Stanesti, Jiwei Chen, Oleg Kobildjanov
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Publication number: 20070007822Abstract: A supply topology comprising an AC to DC or DC to DC adapter and an electronic device with an active system, a battery, and an adapter controller implements closed-loop control of adapter output voltage to limit power consumption by the electronic device to a value related to maximum adapter power. The adapter couples a signal representing maximum adapter power to a control line connected to the electronic device and the electronic device couples an error signal representing the difference between instantaneous power consumption and adapter maximum power onto the same control line. The adapter adjusts its output voltage in response to the magnitude of the error signal. An adapter controller in the electronic device sets a limit for allocating current to battery charging from the signal representing maximum adapter power, with battery charging current approaching zero as instantaneous power consumption approaches maximum adapter power.Type: ApplicationFiled: September 13, 2006Publication date: January 11, 2007Inventors: Doru Cioaca, Constantin Bucur, Alexandru Hartular, Marian Niculae
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Publication number: 20060232241Abstract: A current mode charger controller for controlling a DC to DC converter. The current mode charger may include a first error amplifier having an output coupled to a common node. The first error amplifier may be configured to compare a first signal representative of a charging current provided to a rechargeable battery with a maximum charging current and provide a current control signal in response to the comparison. The current mode charger controller may further include an internal compensation network coupled to the common node, and a comparator configured to compare an inductor current signal representative of an inductor current through an inductor of the DC to DC converter with a compensation signal. The need for any external compensation for the current mode charger controller may be eliminated.Type: ApplicationFiled: November 18, 2005Publication date: October 19, 2006Inventors: Chun Lu, You-Yuh Shyr, Alexandru Hartular, Constantin Bucur
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Publication number: 20060187689Abstract: A portable electrical device may include a DC to DC converter coupled to a common node, a load coupled to the common node, and a controller configured to control the DC to DC converter. The DC to DC converter may be configured to provide a charging current to a rechargeable battery from an adapter when the controller operates said DC to DC converter in a first adapter supply mode. The DC to DC converter may be configured to provide a battery supply current to the load via the common node when the controller operates the DC to DC converter in a second adapter supply mode. The adapter supply current and the battery supply current may add together at the common node to simultaneously provide a load supply current to the load in the second adapter supply mode.Type: ApplicationFiled: November 18, 2005Publication date: August 24, 2006Inventor: Alexandru Hartular
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Publication number: 20060087303Abstract: A controller for a DC to DC converter. The controller may comprise linear mode circuitry and switch mode control circuitry. The linear mode control circuitry may be capable of providing a first control signal to a transistor of the DC to DC converter. The transistor may operate in a linear region in response to the first control signal to control an output voltage of the DC to DC converter. The switch mode control circuitry may be capable of providing a second control signal to the transistor of the DC to DC converter. The transistor may turn ON and OFF in response to the second control signal to control the output voltage of the DC to DC converter. One of the linear mode control circuitry and the switch mode control circuitry may be enabled to control the transistor in response to a state of an enable signal received at the controller.Type: ApplicationFiled: February 15, 2005Publication date: April 27, 2006Inventors: Alexandru Hartular, Chun Lu, You-Yuh Shyr, Constantin Bucur
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Publication number: 20060028188Abstract: A controller for a DC to DC converter. The controller may comprise linear mode circuitry and switch mode control circuitry. The linear mode control circuitry may be capable of providing a first control signal to a controlled device of the DC to DC converter. The controlled device may operate as a variable resistor in response to the first control signal to control an output voltage of the DC to DC converter. The switch mode control circuitry may be capable of providing a second control signal to the controlled device of the DC to DC converter. The controlled device may turn ON and OFF in response to the second control signal to control the output voltage of the DC to DC converter. One of the linear mode control circuitry and the switch mode control circuitry may be enabled. The controller may also include protection circuitry.Type: ApplicationFiled: October 13, 2005Publication date: February 9, 2006Inventors: Alexandru Hartular, Chun Lu, You-Yuh Shyr, Constantin Bucur, Vlad Mihail Popescu-Stanesti, Jiwei Chen, Oleg Kobildjanov