Patents Assigned to 02Micro
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Patent number: 8143862Abstract: 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: GrantFiled: March 12, 2009Date of Patent: March 27, 2012Assignee: 02Micro Inc.Inventors: Guo Xing Li, Jiankui Guo, Xin Dong, Songtao Chen, Ruichao Tang, Chutao Zheng, Celin He
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Patent number: 8127347Abstract: The present invention provides a firewall device that is divided into several virtual firewalls. The users in the Intranet are divided into several user groups based on different security policy demands. Each virtual firewall is equipped with the security policy of the corresponding user group. Each firewall manages one user group in the Intranet. Thus, the present invention reduces the complexity of the firewall management, reduces the extra cost of adding more firewalls and makes the management easier.Type: GrantFiled: December 29, 2006Date of Patent: February 28, 2012Assignee: 02Micro International LimitedInventor: Hisky Xiao
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Patent number: 8120312Abstract: A power supply topology according to one embodiment includes a first path coupled to a controllable DC power source, a second path coupled to a rechargeable battery, and a third path coupled to a system load, the three paths coupled to a common node. The topology may further include a unidirectional switch coupled to the first path and a selectively unidirectional switch coupled to the second path. The topology may further include a power management control circuit including a wake up circuit having a comparison circuit and an output decision circuit. Of course, many alternatives, variations, and modifications are possible without departing from this embodiment.Type: GrantFiled: September 7, 2010Date of Patent: February 21, 2012Assignee: 02Micro International LimitedInventors: Constantin Bucur, Vlad Mihail Popescu-Stanesti, Marian Niculae, Daryl Nees
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Patent number: 8044609Abstract: A circuit for controlling light sources comprises a converter, a feedback circuit and a current distribution controller. The converter is operable for converting an input voltage to an output current and for providing the output current to the light sources. The feedback circuit is coupled to the light sources for generating feedback signals indicative of currents flowing through the light sources respectively. The current distribution controller is coupled to the feedback circuit for generating control signals based on the feedback signals respectively so as to regulate the currents of the light sources respectively, and for controlling the converter to regulate the output current based on the feedback signals.Type: GrantFiled: December 31, 2008Date of Patent: October 25, 2011Assignee: 02Micro IncInventor: Da Liu
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Patent number: 8040334Abstract: A method for driving a display device comprises processing a plurality of sequent frame data by a graphics controller. The graphics controller is capable of optimizing a frame rate and outputting a first plurality of display signals at the frame rate. And then, a timing controller is used to convert the first plurality of display signals into a second plurality of signals at a predetermined refresh rate.Type: GrantFiled: December 21, 2007Date of Patent: October 18, 2011Assignee: 02Micro International LimitedInventor: Heonsu Kim
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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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Patent number: 7948455Abstract: The present invention is an apparatus for driving white LEDs. The apparatus includes a switchable current sink, a DC-DC converter and a reference circuit. The DC-DC converter provides a driving voltage to a plurality of LEDs. The switchable current sink regulates currents through the plurality of LEDs, and the switchable current sink further provides a first reference voltage and outputs a plurality of voltage drops. The reference circuit receives the first reference voltage and the plurality of voltage drops to provide a second reference voltage to the DC-DC converter. The DC-DC converter adjusts the driving voltage provided to the plurality of LEDs according to the second reference voltage. In this way, the driving voltage is regulated to a minimum possible value and consequently the voltage drops across the switchable current sink is minimized. Hence, the LED driving system maintains higher efficiency.Type: GrantFiled: October 20, 2005Date of Patent: May 24, 2011Assignee: 02Micro Inc.Inventors: Mingkwang Han, Footshen Wong, Vlad Popescu-Stanesti, Winson Wong, Jacky Lin
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Patent number: 7898218Abstract: A power supply topology with pulse width modulation frequency control allows the use of an inductor with higher inductance in a converter. By controlling the switching frequency of the pulse width modulation signal, the inductor can achieve high efficiency during a light load condition and is also suitable for a heavy load condition.Type: GrantFiled: May 17, 2007Date of Patent: March 1, 2011Assignee: 02Micro International LimitedInventors: Chun-Hsi Lin, Footshen Wong, Chien Kung, Chen-Hsiang Yu
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Patent number: 7868693Abstract: An amplifier that receives an input signal and outputs an amplified output signal includes an integration stage, a comparison stage, and a full bridge circuit. The integration stage is be used for receiving a constant common mode voltage, for receiving a first signal representing the input signal of the amplifier, and for generating a ramp signal. The comparison stage coupled to the integration stage is used for generating a pulse width modulation signal according to the ramp signal and according to a hysteretic signal. The full bridge circuit coupled to the comparison stage is used for receiving a power supply and the pulse width modulation signal, and for generating the output of the amplifier.Type: GrantFiled: March 5, 2009Date of Patent: January 11, 2011Assignee: 02Micro International LimitedInventors: Marius Padure, Laszlo Lipcsei, Serban Mihai Popescu
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Patent number: 7852756Abstract: A network interface system with packet filtering function is disclosed herein. The network interface system includes interfaces, a packet buffer and a controller. The packet buffer stores data packets received by the network interface system. The controller provides security defense for the host system and the network by filtering the data packets stored in the packet buffer. The controller controls the packet buffer abandoning a data packet if the data packet is identified as an unsafe packet. The controller also includes a regulator for controlling a transferring order of the data packets. Thus, the network interface system can drop unsafe data packet and transfer data packets considered as safe information. The data packets can be processed in a sequence according to preset priority rules.Type: GrantFiled: June 13, 2007Date of Patent: December 14, 2010Assignee: 02Micro International LimitedInventors: Jyshyang Chen, Chao Jiang
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Patent number: 7821229Abstract: 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: December 15, 2008Date of Patent: October 26, 2010Assignee: 02Micro International LimitedInventors: Wei Wang, Guoxing Li, Sean Xiao
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Patent number: 7816896Abstract: Circuits and methods for controlling a converter are disclosed. A first switch within the converter can be turned off, and a second switch within the converter alternately can be turned on and off in response to a switch control signal while the first switch is turned off. By turning the second switch alternately on and off, energy stored in the converter can be recovered to a power source of the converter.Type: GrantFiled: September 14, 2007Date of Patent: October 19, 2010Assignee: 02Micro International LimitedInventors: Laszlo Lipcsei, Serban Popescu, ChengHwa Teh
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Patent number: 7796069Abstract: An analog to digital converter (ADC) converts an analog signal to a digital signal. The ADC includes an input channel, a sampling circuit coupled to the input channel, an integrator coupled to the sampling circuit, and a feedback circuit coupled to the integrator. The input channel receives the analog signal. The sampling circuit samples the analog signal. The integrator receives the sampled analog signal and a feedback signal and integrates a superposition of the sampled analog signal and the feedback signal. The feedback circuit generates the digital signal according to an output of the integrator and sends the feedback signal indicative of the digital signal to the integrator.Type: GrantFiled: December 31, 2008Date of Patent: September 14, 2010Assignee: 02Micro International LimitedInventor: Guo Xing Li
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Patent number: 7633347Abstract: An apparatus and method for operating a phase-locked loop circuit are disclosed. The phase locked loop circuit includes a plurality of resistive elements and a plurality of capacitive elements that are distributed in a charge pump, a loop filter and a voltage controlled oscillator. The plurality of resistive elements have a plurality of resistances that vary in proportion to each other. The plurality of capacitive elements have a plurality of capacitive elements that vary in proportion to each other. A damping factor of the phase-locked loop circuit is maintained substantially constant by the plurality of resistive elements and the plurality of capacitive elements.Type: GrantFiled: May 30, 2007Date of Patent: December 15, 2009Assignee: 02Micro International LimitedInventors: Seeteck Tan, Meng Chu
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Patent number: 7573240Abstract: A method is used for charging a battery. According to the method of the present invention, the battery is first charged to a predetermined voltage at a substantially constant current. Then, the charging current is disabled. A pulsing current is applied to the battery for charging the battery.Type: GrantFiled: April 25, 2005Date of Patent: August 11, 2009Assignee: 02Micro International LimitedInventor: Constantin Spiridon
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Patent number: 7531989Abstract: The present invention is a battery fuel gauge circuit for measuring the capacity of a battery pack. The battery fuel gauge circuit includes an amplifier circuit, a correction circuit, a plurality of comparators, and a multiplexer. The amplifier circuit can sense a discharge current flowing through a sense resistor and a variable temperature from the battery pack and generate a first and a second voltage signals, which are corrected by the correction circuit and compared with a reference voltage by the plurality of comparators. After correction and comparison, the multiplexer can transmit the compared signals to an external indicating circuit that controls the display of the capacity of the battery pack.Type: GrantFiled: May 9, 2006Date of Patent: May 12, 2009Assignee: 02Micro International Ltd.Inventor: Stefan Maireanu
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Patent number: 7526015Abstract: A method for processing spread spectrum signals through a two step integration process in a circuit having an intermediate frequency signal preprocessing unit and a plurality of block integrators, wherein the circuit receiving a digitized signal, a local reference signal, and a pseudorandom noise code. The method includes generating a plurality of data streams by the intermediate frequency signal preprocessing unit using the digitized signal and the reference signal, receiving at each block integrator a data stream from the plurality of data streams and the pseudorandom noise code, performing a predetermined number of partial correlations at each block integrator using hybrid correlation technique based on the data stream and the pseudorandom noise code to obtain a predetermined number of partial correlation results, and computing a predetermined number of complete correlation results based on the predetermined number of partial correlation results.Type: GrantFiled: September 15, 2005Date of Patent: April 28, 2009Assignee: 02Micro International Ltd.Inventors: MingQiang Cheng, ShiJie Li, Bo Yu
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Patent number: 7515445Abstract: A CCFL power converter circuit is provided using a high-efficiency zero-voltage-switching technique that eliminates switching losses associated with the power MOSFETs. An optimal sweeping-frequency technique is used in the CCFL ignition by accounting for the parasitic capacitance in the resonant tank circuit. Additionally, the circuit is self-learning and is adapted to determine the optimum operating frequency for the circuit with a given load. An over-voltage protection circuit can also be provided to ensure that the circuit components are protected in the case of open-lamp condition.Type: GrantFiled: April 24, 2002Date of Patent: April 7, 2009Assignee: 02Micro International LimitedInventor: Yung-Lin Lin
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Patent number: 7504746Abstract: A differential driving circuit is provided that reduces ripple current. The differential driving circuit is operable to supply a linear current in a low current mode and a PWM current in a high current mode. Depending on the direction of current flow through the load, heating and cooling is provided for loads such as a thermal electric cooler.Type: GrantFiled: July 22, 2003Date of Patent: March 17, 2009Assignee: 02Micro International LimitedInventors: Foot Shen Wong, Haijun “Halley” Chen, Mingpan Li