Patents by Inventor Leif E. LaWhite
Leif E. LaWhite 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: 8644027Abstract: Electronics mounted on a printed circuit board are housed within a high conductivity case with connecting pins extending therethrough. The case is filled with thermally conductive potting material to provide thermal conduction from the printed circuit board to the case. The case may be a conduit having open ends through which the printed circuit board is inserted or it may comprise a cover mounted to a base plate.Type: GrantFiled: July 16, 2010Date of Patent: February 4, 2014Assignee: SynQor, Inc.Inventors: Lennart Pitzele, Abram P. Dancy, Leif E. LaWhite, Rene Hemond, Martin F. Schlecht
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Publication number: 20100328912Abstract: Electronics mounted on a printed circuit board are housed within a high conductivity case with connecting pins extending therethrough. The case is filled with thermally conductive potting material to provide thermal conduction from the printed circuit board to the case. The case may be a conduit having open ends through which the printed circuit board is inserted or it may comprise a cover mounted to a base plate.Type: ApplicationFiled: July 16, 2010Publication date: December 30, 2010Inventors: Lennart Pitzele, Abram P. Dancy, Leif E. LaWhite, Rene Hemond, Martin F. Schlecht
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Patent number: 7765687Abstract: Electronics mounted on a printed circuit board are housed within a high conductivity case with connecting pins extending therethrough. The case is filled with thermally conductive potting material to provide thermal conduction from the printed circuit board to the case. The case may be a conduit having open ends through which the printed circuit board is inserted or it may comprise a cover mounted to a base plate.Type: GrantFiled: August 11, 2006Date of Patent: August 3, 2010Assignee: SynQor, Inc.Inventors: Lennart Pitzele, Abram P. Dancy, Leif E. LaWhite, Rene Hemond, Martin F. Schlecht
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Patent number: 7119524Abstract: A DC to DC power converter includes synchronous rectifiers which respond to a control waveform. Negative current from a load into the power converter is prevented by increasing the converter output voltage at a minimum current limit. The synchronous rectifiers may be held off in response to decision logic by activation of a hold-off circuit connected to a control terminal of a synchronous rectifier or of an ORing transistor at the converter output. When the synchronous rectifier is subsequently enabled, its control waveform may be increased slowly relative to the switching cycle.Type: GrantFiled: August 3, 2004Date of Patent: October 10, 2006Assignee: Bank America, N.A.Inventors: Joshua H. Bretz, Abram P. Dancy, Leif E. LaWhite, Martin F. Schlecht
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Patent number: 6927987Abstract: Half-bridge isolation stage topologies are provided in power converters, dividing an input voltage between capacitors. Primary transformer windings are periodically switched across respective capacitors. In current-fed implementations, the current flow through the primary windings is constrained as by an inductive element. In some implementations, a capacitor, primary winding and switch are connected in series in different orders in each of plural legs across the input. Current feed circuitry includes a current constraining component connecting nodes within each of respective legs. The switches of the isolation stage may be turned on with a fixed duty cycle, and a secondary circuit may comprise synchronous rectifiers.Type: GrantFiled: November 13, 2002Date of Patent: August 9, 2005Assignee: SynQor, Inc.Inventors: Richard Farrington, Abram P. Dancy, Leif E. LaWhite, Martin F. Schlecht
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Patent number: 6894468Abstract: A DC to DC power converter includes synchronous rectifiers which respond to a control waveform. Negative current from a load into the power converter is prevented by increasing the converter output voltage at a minimum current limit. The synchronous rectifiers may be held off in response to decision logic by activation of a hold-off circuit connected to a control terminal of a synchronous rectifier or of an ORing transistor at the converter output. When the synchronous rectifier is subsequently enabled, its control waveform may be increased slowly relative to the switching cycle.Type: GrantFiled: July 7, 2000Date of Patent: May 17, 2005Assignee: Synqor, Inc.Inventors: Joshua H. Bretz, Abram P. Dancy, Leif E. LaWhite, Martin F. Schlecht
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Publication number: 20040207459Abstract: A charge pump circuit in a gate controller provides a pumped gate control voltage to switches of a DC/DC converter. Different input voltages may be applied to the controller and an input voltage higher than the charge pump output could result in circuit damage. A clamp circuit between the input and output prevents the output voltage from being significantly below the input voltage to prevent such damage. The clamp circuit may be a transistor controlled by a comparator or amplifier.Type: ApplicationFiled: January 26, 2004Publication date: October 21, 2004Applicant: SynQor, Inc.Inventors: Thomas Farkas, Abram P. Dancy, Leif E. LaWhite, Martin F. Schlecht
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Publication number: 20030123264Abstract: Half-bridge isolation stage topologies are provided in power converters, dividing an input voltage between capacitors. Primary transformer windings are periodically switched across respective capacitors. In current-fed implementations, the current flow through the primary windings is constrained as by an inductive element. In some implementations, a capacitor, primary winding and switch are connected in series in different orders in each of plural legs across the input. Current feed circuitry includes a current constraining component connecting nodes within each of respective legs. The switches of the isolation stage may be turned on with a fixed duty cycle, and a secondary circuit may comprise synchronous rectifiers.Type: ApplicationFiled: November 13, 2002Publication date: July 3, 2003Applicant: SynQor, Inc.Inventors: Richard Farrington, Abram P. Dancy, Leif E. LaWhite, Martin F. Schlecht
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Patent number: 6577109Abstract: Bang or bang-bang control is applied to interleaved power converters. With the bang control on, oscillator signals applied to the power converters are overridden in order to change the power output of both power converters. When the override is removed, both oscillating signals continue from points in their cycles at which they were overridden. An oscillator may be frozen during override by interrupting the charging and discharging of a capacitor in the oscillator.Type: GrantFiled: August 17, 2001Date of Patent: June 10, 2003Assignee: SynQor, Inc.Inventors: Abram P. Dancy, Leif E. LaWhite
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Publication number: 20020048180Abstract: Bang or bang-bang control is applied to interleaved power converters. With the bang control on, oscillator signals applied to the power converters are overridden in order to change the power output of both power converters. When the override is removed, both oscillating signals continue from points in their cycles at which they were overridden. An oscillator may be frozen during override by interrupting the charging and discharging of a capacitor in the oscillator.Type: ApplicationFiled: August 17, 2001Publication date: April 25, 2002Applicant: SynQor Inc.Inventors: Abram P. Dancy, Leif E. LaWhite
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Patent number: 5492016Abstract: A melt pressure measurement probe for insertion through wall of melt-containing vessel has a pressure-deflectable end portion for contact with pressurized melt. Pressure-resistant securing means fixes the end surface in a non-flow obstruction relationship. A seal surface on the probe prevents exposure of the melt to the securing means. Pressure detection means internal of the probe, responsive to deflection of the probe end surface to detect melt pressure, comprises a temperature-compensated capacitive sensor, one capacitor plate defined by the end portion and an opposite capacitor plate in the probe with a capacitive gap in-between. Electronic circuitry remote from the melt-exposed end, including circuitry within the probe to generate a signal proportional to the capacitance, compensates for change of temperature of the capacitor to generate an output signal proportional to melt pressure.Type: GrantFiled: December 14, 1993Date of Patent: February 20, 1996Assignee: Industrial Sensors, Inc.Inventors: Gino A. Pinto, Leif E. Lawhite, Gerard Eggleston, Robert B. Carr, Boruch B. Frusztajer
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Patent number: 5224383Abstract: The invention features a melt pressure measurement device for measuring the pressure of a melted substance useful in cooled state for forming solid objects. The device comprises a probe for insertion through an aperture in a wall of a melt-containing vessel, with the probe having a pressure-deflectable end surface for contact with pressurized melt. The probe has pressure-resistant securing means for fixing the probe in the wall with the end surface of the probe exposed for contact with the melt in a non-flow obstructive relationship. A seal surface on the probe between the end of the probe and the securing means provides cooperative sealing action with a mating sealing means associated with the wall to prevent exposure of the melt to the securing means. The probe also has pressure detection means internal of the probe, responsive to deflection of the end surface of the probe, for detecting pressure of the melt.Type: GrantFiled: June 14, 1991Date of Patent: July 6, 1993Assignee: Industrial Sensors, Inc.Inventors: Gino A. Pinto, Leif E. LaWhite, Gerard Eggelston, Robert B. Carr, Boruch B. Frusztajer