Patents by Inventor Nicholas Celenza
Nicholas Celenza 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: 9853444Abstract: A method of controlling the inrush current to a hot plug device. The method includes directing current from an input power rail of the hot plug device to an output power rail of the hot plug device through a high impedance auxiliary current path, wherein an electronic subsystem of the hot plug device is coupled to the output power rail. The method further includes allowing current from the input power rail to pass through a plurality of main turn on FETs to the output power rail in response to the output power rail having a voltage that exceeds a voltage threshold as a result of directing current through the high impedance auxiliary current path.Type: GrantFiled: August 20, 2015Date of Patent: December 26, 2017Assignee: International Business Machines CorporationInventors: Jamaica L. Barnette, Nicholas Celenza, Brian C. Totten
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Patent number: 9787085Abstract: A hot plug device includes an electronic subsystem and a plurality of main turn on FETs, wherein each main turn on FET includes a gate, a power input for coupling to a power source, and an output for controllably providing power to the electronic subsystem. An auxiliary current path is in parallel with the main turn on FETs and includes a fuse, an impedance element and an auxiliary turn on FET. A turn on controller controls the main turn on FETs and the auxiliary turn on FET. Current is initially through the high impedance auxiliary current path to apply voltage to an output power rail. Subsequently, current is allowed to pass through a plurality of main turn on FETs to the output power rail in response to the output power rail having a voltage exceeding a voltage threshold as a result of using the high impedance auxiliary current path.Type: GrantFiled: April 18, 2014Date of Patent: October 10, 2017Assignee: International Business Machines CorporationInventors: Jamaica L. Barnette, Nicholas Celenza, Brian C. Totten
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Patent number: 9362901Abstract: A method for controlling the in-rush current to a hot plug device. The method includes providing a series of turn on pulses to the gates of a plurality of turn on FETs on a hot plug device coupled to a direct current power source, wherein each pulse causes the plurality of FETs to pass current from the direct current power source to a subsystem of the hot plug device, and wherein each pulse has a duration that ends before the impedance of the turn on FETs falls below a safe operating region. The method further includes providing a steady turn on signal to the FETs in response to the output voltage from the FETs to a subsystem of the hot plug device exceeding a predetermined voltage threshold.Type: GrantFiled: August 20, 2015Date of Patent: June 7, 2016Assignee: International Business Machines CorporationInventors: Jamaica L. Barnette, Nicholas Celenza, Brian C. Totten
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Patent number: 9306559Abstract: A computer program product for controlling the in rush current to a hot plug device. The computer program product includes program instructions that cause a processor to perform a method. The method includes providing a series of turn on pulses to the gates of a plurality of turn on FETs on a hot plug device coupled to a direct current power source, wherein each pulse causes the plurality of FETs to pass current from the direct current power source to a subsystem of the hot plug device, and wherein each pulse has a duration that ends before the impedance of the turn on FETs falls below a safe operating region. The method further includes providing a steady turn on signal to the FETs in response to the output voltage from the FETs to a subsystem of the hot plug device exceeding a predetermined voltage threshold.Type: GrantFiled: April 18, 2014Date of Patent: April 5, 2016Assignee: International Business Machines CorporationInventors: Jamaica L. Barnette, Nicholas Celenza, Brian C. Totten
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Publication number: 20150357811Abstract: A method of controlling the inrush current to a hot plug device. The method includes directing current from an input power rail of the hot plug device to an output power rail of the hot plug device through a high impedance auxiliary current path, wherein an electronic subsystem of the hot plug device is coupled to the output power rail. The method further includes allowing current from the input power rail to pass through a plurality of main turn on FETs to the output power rail in response to the output power rail having a voltage that exceeds a voltage threshold as a result of directing current through the high impedance auxiliary current path.Type: ApplicationFiled: August 20, 2015Publication date: December 10, 2015Inventors: Jamaica L. Barnette, Nicholas Celenza, Brian C. Totten
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Publication number: 20150358012Abstract: A method for controlling the in-rush current to a hot plug device. The method includes providing a series of turn on pulses to the gates of a plurality of turn on FETs on a hot plug device coupled to a direct current power source, wherein each pulse causes the plurality of FETs to pass current from the direct current power source to a subsystem of the hot plug device, and wherein each pulse has a duration that ends before the impedance of the turn on FETs falls below a safe operating region. The method further includes providing a steady turn on signal to the FETs in response to the output voltage from the FETs to a subsystem of the hot plug device exceeding a predetermined voltage threshold.Type: ApplicationFiled: August 20, 2015Publication date: December 10, 2015Inventors: Jamaica L. Barnette, Nicholas Celenza, Brian C. Totten
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Publication number: 20150303917Abstract: A method control the in rush current to the hot plug device. The method includes providing a series of turn on pulses to the gates of a plurality of turn on FETs on a hot plug device coupled to a direct current power source, wherein each pulse causes the plurality of FETs to pass current from the direct current power source to a subsystem of the hot plug device, and wherein each pulse has a duration that ends before the impedance of the turn on FETs falls below a safe operating region. The method further includes providing a steady turn on signal to the FETs in response to the output voltage from the FETs to a subsystem of the hot plug device exceeding a predetermined voltage threshold.Type: ApplicationFiled: April 18, 2014Publication date: October 22, 2015Applicant: International Business Machines CorporationInventors: Jamaica L. Barnette, Nicholas Celenza, Brian C. Totten
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Publication number: 20150303683Abstract: A hot plug device includes an electronic subsystem and a plurality of main turn on FETs, wherein each main turn on FET includes a gate, a power input for coupling to a power source, and an output for controllably providing power to the electronic subsystem. An auxiliary current path is in parallel with the main turn on FETs and includes a fuse, an impedance element and an auxiliary turn on FET. A turn on controller controls the main turn on FETs and the auxiliary turn on FET. Current is initially through the high impedance auxiliary current path to apply voltage to an output power rail. Subsequently, current is allowed to pass through a plurality of main turn on FETs to the output power rail in response to the output power rail having a voltage exceeding a voltage threshold as a result of using the high impedance auxiliary current path.Type: ApplicationFiled: April 18, 2014Publication date: October 22, 2015Applicant: International Business Machines CorporationInventors: Jamaica L. Barnette, Nicholas Celenza, Brian C. Totten
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Patent number: 8526152Abstract: Administering offset voltage error in a current sensing circuit including recording by a power supply management module a current sensing voltage for a power supply when no operating load is drawn from the power supply and dynamically calculating by the power supply management module output current of the power supply with an active load in dependence upon the recorded current sensing voltage.Type: GrantFiled: April 30, 2012Date of Patent: September 3, 2013Assignee: International Business Machines CorporationInventors: Nicholas Celenza, Ismael Orozco Biaggi
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Publication number: 20120212054Abstract: Administering offset voltage error in a current sensing circuit including recording by a power supply management module a current sensing voltage for a power supply when no operating load is drawn from the power supply and dynamically calculating by the power supply management module output current of the power supply with an active load in dependence upon the recorded current sensing voltage.Type: ApplicationFiled: April 30, 2012Publication date: August 23, 2012Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Nicholas Celenza, Ismael Orozco Biaggi
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Patent number: 8208237Abstract: Administering offset voltage error in a current sensing circuit including recording by a power supply management module a current sensing voltage for a power supply when no operating load is drawn from the power supply and dynamically calculating by the power supply management module output current of the power supply with an active load in dependence upon the recorded current sensing voltage.Type: GrantFiled: September 30, 2008Date of Patent: June 26, 2012Assignee: International Business Machines CorporationInventors: Nicholas Celenza, Ismael Orozco Biaggi
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Publication number: 20100078999Abstract: Administering offset voltage error in a current sensing circuit including recording by a power supply management module a current sensing voltage for a power supply when no operating load is drawn from the power supply and dynamically calculating by the power supply management module output current of the power supply with an active load in dependence upon the recorded current sensing voltage.Type: ApplicationFiled: September 30, 2008Publication date: April 1, 2010Applicant: International Business Machines CorporationInventors: NICHOLAS CELENZA, ISMAEL OROZCO BIAGGI
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Patent number: 6163136Abstract: A battery charger to recharge a battery comprises a transistor switch coupled with a cable loss compensator. Additionally, the battery charger includes a comparator, a current limiter, and a differential amplifier. The circuits are created from discrete components, and particularly include individual transistors. A smoothing network takes the signal from the switch and passes it along to the battery for recharging.Type: GrantFiled: December 7, 1999Date of Patent: December 19, 2000Assignee: Ericsson Inc.Inventor: Nicholas Celenza
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Patent number: 5049805Abstract: An apparatus which connects/disconnects battery from a load such as a computer system includes a first circuit arrangement which sets a first reference voltage level at which the energy source is connected through an FET device to the computer system, a second circuit arrangement that sets a second voltage level at which the energy source is disconnected by the FET device from the computer system and a third circuit arrangement which controls the FET device so that said FET device is forced into either its ON or OFF state once one of the reference voltages is reached. A second apparatus which reduces power dissipation in a battery charger power device by forcing the input voltage to track the battery voltage as the battery charges/discharges.Type: GrantFiled: May 25, 1990Date of Patent: September 17, 1991Assignee: International Business Machines CorporationInventors: Nicholas Celenza, Raymond M. Clemo, Ronald S. Jungling, Brian D. Miller
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Patent number: 4888545Abstract: Described is a novel power supply for generating a constant d.c. voltage from a variable a.c. voltage supply line. The power supply includes a plurality of switch circuits which monitor voltage levels on respective secondary windings of a power transformer and as voltage levels change, one of the plurality of switch circuits is selected to charge a capacitor which provides a range of d.c. voltages which are processed to provide the constant d.c. voltage.Type: GrantFiled: June 1, 1988Date of Patent: December 19, 1989Assignee: International Business Machines Corp.Inventors: Nicholas Celenza, Elie M. Najm