Patents by Inventor James L. Yost
James L. Yost 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: 8493037Abstract: An energy capture circuit for capturing energy in response to an input pulse. The circuit is constructed and arranged to transfer input energy in time divided portions among subcircuits. This includes a storage means, a clock means, at least two subcircuits, and at least one transfer circuit. Each subcircuit includes a first inductive means in operative communication with the input source, a rectifying means for producing a positive current in operative communication with the first inductive means, a capacitive means in operative communication with the rectifying means, and a switch means in operative communication with the capacitive means. At least one transfer circuit is in operative communication with each of the switch means of the at least two subcircuits. The output of the clock means is in operative communication with both a first switch means and an inverter means, the inverter means having an output in operative communication with a second switch means.Type: GrantFiled: February 3, 2011Date of Patent: July 23, 2013Assignee: Alliant Techsystems Inc.Inventors: John E. Overland, James L. Yost
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Patent number: 8446132Abstract: Methods and apparatuses are disclosed for power conversion for fuzes and other electrical power consumers. A current monitor coupled to a power source signal generates a source current indicator. A controller generates a control signal responsive to the source current indicator. A filter well is coupled to the power source signal. An inductive switch circuit switchably grounds a rectified inductive load coupled to an output side of the filter well in response to the control signal, developing a pulsed power signal. A resonance rectifier presents substantially lossless resistive impedance for the pulsed power signal and rectifies the pulsed power signal to charge a charge storage device and generate a power output signal. The filter well, the inductive switch circuit, and the controller maintain the source current indicator within a predetermined current range by filtering the pulsed power signal and adjusting the control signal's frequency responsive to the source current indicator.Type: GrantFiled: February 4, 2011Date of Patent: May 21, 2013Assignee: Alliant Techsystems Inc.Inventors: James L. Yost, John E. Overland, Jason A. Christensen
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Publication number: 20120200278Abstract: Methods and apparatuses are disclosed for power conversion for fuzes and other electrical power consumers. A current monitor coupled to a power source signal generates a source current indicator. A controller generates a control signal responsive to the source current indicator. A filter well is coupled to the power source signal. An inductive switch circuit switchably grounds a rectified inductive load coupled to an output side of the filter well in response to the control signal, developing a pulsed power signal. A resonance rectifier presents substantially lossless resistive impedance for the pulsed power signal and rectifies the pulsed power signal to charge a charge storage device and generate a power output signal. The filter well, the inductive switch circuit, and the controller maintain the source current indicator within a predetermined current range by filtering the pulsed power signal and adjusting the control signal's frequency responsive to the source current indicator.Type: ApplicationFiled: February 4, 2011Publication date: August 9, 2012Applicant: ALLIANT TECHSYSTEMS INC.Inventors: James L. Yost, John E. Overland, Jason A. Christensen
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Publication number: 20110121792Abstract: An energy capture circuit for capturing energy in response to an input pulse. The circuit is constructed and arranged to transfer input energy in time divided portions among subcircuits. This includes a storage means, a clock means, at least two subcircuits, and at least one transfer circuit. Each subcircuit includes a first inductive means in operative communication with the input source, a rectifying means for producing a positive current in operative communication with the first inductive means, a capacitive means in operative communication with the rectifying means, and a switch means in operative communication with the capacitive means. At least one transfer circuit is in operative communication with each of the switch means of the at least two subcircuits. The output of the clock means is in operative communication with both a first switch means and an inverter means, the inverter means having an output in operative communication with a second switch means.Type: ApplicationFiled: February 3, 2011Publication date: May 26, 2011Applicant: ALLIANT TECHSYSTEMS INC.Inventors: John E. Overland, James L. Yost
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Patent number: 7884579Abstract: An energy capture circuit for capturing energy in response to an input pulse. The circuit is constructed and arranged to transfer input energy in time divided portions among subcircuits. This includes a storage means, a clock means, at least two subcircuits, and at least one transfer circuit. Each subcircuit includes a first inductive means in operative communication with the input source, a rectifying means for producing a positive current in operative communication with the first inductive means, a capacitive means in operative communication with the rectifying means, and a switch means in operative communication with the capacitive means. At least one transfer circuit is in operative communication with each of the switch means of the at least two subcircuits. The output of the clock means is in operative communication with both a first switch means and an inverter means, the inverter means having an output in operative communication with a second switch means.Type: GrantFiled: October 26, 2007Date of Patent: February 8, 2011Assignee: Alliant Techsystems Inc.Inventors: John E. Overland, James L. Yost
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Publication number: 20090108815Abstract: An energy capture circuit for capturing energy in response to an input pulse. The circuit is constructed and arranged to transfer input energy in time divided portions among subcircuits. This includes a storage means, a clock means, at least two subcircuits, and at least one transfer circuit. Each subcircuit includes a first inductive means in operative communication with the input source, a rectifying means for producing a positive current in operative communication with the first inductive means, a capacitive means in operative communication with the rectifying means, and a switch means in operative communication with the capacitive means. At least one transfer circuit is in operative communication with each of the switch means of the at least two subcircuits. The output of the clock means is in operative communication with both a first switch means and an inverter means, the inverter means having an output in operative communication with a second switch means.Type: ApplicationFiled: October 26, 2007Publication date: April 30, 2009Applicant: ALLIANT TECHSYSTEMS INC.Inventors: John E. Overland, James L. Yost
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Patent number: 7279857Abstract: A method for reducing commutation-related acoustic noise in a fan system is provided. A constant frequency periodic signal is generated and a fan commutation event is synchronized with a zero level value of the constant frequency periodic signal. A system for controlling a direct current fan is provided. The system comprises a signal generator adapted to produce a periodic signal of a constant frequency and a phase-locked loop. A zero level value of the periodic signal is synchronized with a commutation event of the fan.Type: GrantFiled: August 27, 2003Date of Patent: October 9, 2007Assignee: Hewlett-Packard Development Company, L.P.Inventors: Samuel M. Babb, Jeffrey S. Weaver, James L. Yost, Garland E. Lee, Peter M. Piotrowski