Livescu
Constantin D. Livescu, Austin, TX US
Patent application number | Description | Published |
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20090080222 | System and Method for Power Saving Conversion Topology in Switch Mode Power Supplies - A power supply includes an input filter and rectifier module, a digital control module, and a converter module. The input filter and rectifier module is configured to rectify an input voltage. The digital control module is adapted to prevent a potential saturation of a transformer by setting a maximum allowable duty cycle for a control signal transmitted to the transistor based on an input voltage. The digital control model is further adapted to reduce switching losses in the power supply by setting the control signal switching frequency, based on the input voltage. The converter module is configured to convert the input voltage into a direct current output voltage based upon the control signal. | 03-26-2009 |
20090174386 | Power Supply Start-Up and Brown-Out Inrush Management Circuit - A power supply device including a diode bridge, a converter module, and an inrush control module. The diode bridge is adapted to rectify an input voltage. The converter module is coupled to the diode bridge and is adapted to convert the input voltage into a direct current regulated output voltage. The inrush control module is connected to the diode bridge and is adapted to gradually activate a transistor and to limit an inrush current peak value based upon a zero crossing being detected in the input voltage. A method for limiting the inrush current peak value is also disclosed. | 07-09-2009 |
20090254768 | Non-Identical Power Supply Units for Higher Efficiency in Redundant Mode - A power supply system for a server includes a first power supply, a second power supply, a first variable slope circuit, and a second variable slope circuit. The first power supply unit is adapted to activate if a load is below a predetermined level, and adapted to deactivate if the load is above the predetermined level. The second power supply unit is adapted to activate if the load is above the predetermined level, and adapted to deactivate if the load is below the predetermined level. The first and second variable slope circuits are adapted to receive information about the load applied to the power supply units. The first variable slope circuit is adapted to deactivate the first power supply unit if the load is above the predetermined level. The second variable slope circuit is to deactivate the second power supply unit if the load is below the predetermined level. | 10-08-2009 |
20100052641 | System and Method for Improving Efficiency of a Power Factor Correction Boost Pre-Regulator - A power supply device comprises a driver circuit, a transistor switch, and a first transistor. The driver circuit is configured to provide a stable driving signal and a floating driving signal. The transistor switch has a first terminal, a second terminal connected to a first terminal of the driver circuit, and a third terminal connected to a second terminal of the driver circuit, and is configured to prevent a reverse current based on the floating driving signal. The first transistor has a first current electrode connected to the first terminal of the transistor switch, a second current electrode connected to the first voltage reference, and a control electrode connected to the third terminal of the driver circuit, and is configured to activate and deactivate based on the stable driving signal, and further configured to regulate an input voltage to a substantially constant direct current output voltage. | 03-04-2010 |
Constantin Darius Livescu, Austin, TX US
Patent application number | Description | Published |
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20100102784 | Soft-Switching Voltage Regulation in a Step-Down Circuit - An information handling system may comprise a direct-current to direct-current step-down power converter, a memory, and a processor. The step-down power converter may include a first inductive unit, a first switching unit connected between a voltage source and the first inductive unit, a second switching unit connected to ground, a capacitance unit connected between the second switching unit and the first inductive unit, and a second inductive unit connected between the second switching unit and the first inductive unit. The capacitance unit is configured to delay a change in voltage across the first or second switching units, and the second inductive unit is configured to delay a change in current in the first or second switching units. | 04-29-2010 |
Dorel Livescu, Marlboro, NJ US
Patent application number | Description | Published |
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20080311894 | METHOD AND APPARATUS FOR PRESENTING AND CONTROLLING INFORMATION FOR MANAGING AN EVENT - The invention includes a method and apparatus for displaying and controlling information for managing an event. A method according to one embodiment includes displaying accountability information associated with a unit deployed to the event where the accountability information is indicative of accountability of the unit with respect to at least one function to be performed for the event, displaying communication information in a manner for facilitating communications for the event, and displaying status information associated with the at least one unit deployed to the event, wherein the information is displayed in a manner tending to enable control of the information for managing the event. | 12-18-2008 |
20090085740 | METHOD AND APPARATUS FOR CONTROLLING VIDEO STREAMS - The invention includes a method and apparatus for controlling video streams. A method includes monitoring for an event associated with one of a plurality of video camera controllers providing a plurality of video streams where each of the video streams has a first quality level, and, in response to detecting an event associated with one of the plurality of video camera controllers, propagating a control message toward the one of the video camera controllers for which the event is detected, where a control message adapted for requesting the one of the video camera controllers to switch from providing the video stream using the first quality level to providing the video stream using a second quality level. The first quality level may be a low level of quality and the second quality level may be a high level of quality. | 04-02-2009 |
Gabriela Livescu, Marlboro, NJ US
Patent application number | Description | Published |
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20100266164 | METHOD AND APPARATUS FOR MAKING AND DETECTING A DOCUMENT VERIFICATION INDICATOR USING OPTICAL PATTERN ENCRYPTION - A method and apparatus for creating and detecting an optically encoded document having a uniquely designed document verification indicator is disclosed. One embodiment includes applying a spatially varying Brewster angle pattern on a substrate. Another embodiment includes an apparatus for detecting the spatially varying Brewster angle pattern including a light source, a slit aperture, a polarizer, at least one parabolic mirror, and an image capturing device. | 10-21-2010 |
Silviu Livescu, Calgary CA
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20150101399 | FRICTION APPARATUS AND METHOD FOR MEASURING LUBRICITY OF DOWNHOLE FLUIDS - A lubricity testing apparatus may have a first surface configured for moving against a second surface, a second surface, a measurement device in communication with the first surface, and an actuator in communication with the first surface. A fluid may be circulated about or over at least one of the surfaces. The measurement device may measure at least one force encountered when the first surface moves against the second surface. The actuator may move the first surface against the second surface. At least one force related to the first surface may be measured as the first surface moves against the second surface to determine the lubricity of the fluid. | 04-16-2015 |