Patents Assigned to L&L Engineering LLC
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Publication number: 20110175582Abstract: A system includes a first switch connected to a voltage input and a switching node. A second switch is connected to the switching node and a reference potential. A first circuit generates first rising edges and first falling edges by comparing a voltage at the switching node to a first voltage reference. The first voltage reference is between the reference potential and the voltage input. A second circuit generates second rising edges and second falling edges by comparing the switching node voltage to a second voltage reference. The second voltage reference is less than the reference potential. The controller calculates delay times based on the first rising edges, the first falling edges, the second rising edges and the second falling edges. The controller generates drive signals for the first switch and the second switch based on a duty cycle and the delay times.Type: ApplicationFiled: January 24, 2011Publication date: July 21, 2011Applicants: L&L Engineering LLC, Fairchild Semiconductor Corp.Inventors: Paul W. Latham, Stewart Kenly, Laszlo Balogh
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Patent number: 7915881Abstract: A method and apparatus for converting a DC voltage to a lower DC voltage, provides for conducting current from an input terminal, through an inductor to charge a capacitor connected to the inductor at an output terminal and to provide a varying range of load current from the output terminal, alternately switching the input terminal between a supply voltage and a ground potential to produce a desired voltage at the output terminal that is lower than the supply voltage, while providing the varying range of load current, and disconnecting the input terminal from both the supply voltage and the ground potential to reduce an increase in voltage at the output terminal caused by a substantial reduction in the load current, while current through the inductor adjusts in response to the reduced load current.Type: GrantFiled: September 10, 2009Date of Patent: March 29, 2011Assignee: L&L Engineering, LLCInventors: Paul W. Latham, II, Stewart Kenly
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Patent number: 7884591Abstract: A nonlinear PWM controller for switching power supplies.Type: GrantFiled: January 13, 2010Date of Patent: February 8, 2011Assignee: L&L Engineering LLCInventors: Paul Latham, John C. Canfield
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Patent number: 7880454Abstract: Systems and methods control timing of switches in power regulators and power amplifiers. The systems and methods monitor a switch node voltage and obtain rising and falling edges of signals obtained from the monitoring. The systems and methods utilize the rising and falling edges of switch drive signals and predetermined data to obtain delay times for subsequent drive signals.Type: GrantFiled: December 21, 2007Date of Patent: February 1, 2011Assignees: L&L Engineering LLC, Fairchild Semiconductor CorporationInventors: Paul W. Latham, II, Stewart Kenly, Laszlo Balogh
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Patent number: 7746048Abstract: A nonlinear PWM controller for switching power supplies.Type: GrantFiled: November 10, 2006Date of Patent: June 29, 2010Assignee: L&L Engineering, LLCInventors: Paul Latham, John C. Canfield
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Patent number: 7696736Abstract: A method and apparatus for converting a DC voltage to a lower DC voltage, provides for conducting current from an input terminal, through an inductor to charge a capacitor connected to the inductor at an output terminal and to provide a varying range of load current from the output terminal, alternately switching the input terminal between a supply voltage and a ground potential to produce a desired voltage at the output terminal that is lower than the supply voltage, while providing the varying range of load current, and disconnecting the input terminal from both the supply voltage and the ground potential to reduce an increase in voltage at the output terminal caused by a substantial reduction in the load current, while current through the inductor adjusts in response to the reduced load current.Type: GrantFiled: November 10, 2006Date of Patent: April 13, 2010Assignee: L&L Engineering LLCInventors: Paul Latham, Stewart Kenly
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Publication number: 20090284992Abstract: Methods for selecting between the two modes (states) of operation, continuous conduction and discontinuous conduction, are disclosed. Systems that are capable of selecting the operating mode and operating in the continuous conduction mode or the discontinuous conduction mode are also disclosed.Type: ApplicationFiled: May 13, 2008Publication date: November 19, 2009Applicant: L&L Engineering. LLCInventors: Stewart Kenly, Paul W. Latham, II
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Patent number: 7545130Abstract: Methods and systems for nonlinear control of switching power supplies.Type: GrantFiled: November 10, 2006Date of Patent: June 9, 2009Assignee: L&L Engineering, LLCInventor: Paul Latham
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Patent number: 7498781Abstract: Feedforward compensated systems and methods for their use in disturbance rejection in switching power converters and other systems. In one instance, a compensating component receives a sensed output and provides a duty cycle adjustment signal, the duty cycle adjustment signal being obtained from signals indicative of present and past load current variations. In another instance, an adaptive compensating component receives a sensed output and provides an adjustment signal for compensating for load variations. A compensator design component receives the digitized sensed output and of provides compensating component parameters to the adaptive compensating component; the compensator design component including a learning function.Type: GrantFiled: April 2, 2007Date of Patent: March 3, 2009Assignee: L&L Engineering LLCInventors: John C. Canfield, Paul W. Latham
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Publication number: 20090027025Abstract: In one embodiment, the controller of these teachings includes a nonlinear controller component capable of providing an amplitude determining input signal to a control signal providing component, the control signal providing component providing output having a predetermined amplitude substantially over one time interval from a number of time intervals or output having a predetermined average amplitude substantially over one time interval from a number of time intervals, the amplitude determining input signal corresponding to at least one predetermined system state variable. The nonlinear controller component is operatively connected to receive as inputs at least one predetermined system state variable. A relationship between the amplitude determining input signal and at least one predetermined system state variable is obtained by a predetermined method.Type: ApplicationFiled: August 19, 2008Publication date: January 29, 2009Applicant: L&L Engineering, LLCInventors: Paul W. Latham, John C. Canfield
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Publication number: 20090016424Abstract: Methods and systems for digital control utilizing oversampling.Type: ApplicationFiled: September 8, 2008Publication date: January 15, 2009Applicant: L&L ENGINEERING LLCInventors: Paul Latham, Stewart Kenly
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Patent number: 7466254Abstract: Methods and systems for digital control.Type: GrantFiled: October 19, 2006Date of Patent: December 16, 2008Assignee: L&L Engineering LLCInventors: Paul Latham, Stewart Kenly
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Publication number: 20070236200Abstract: Feedforward compensated systems and methods for their use.Type: ApplicationFiled: April 2, 2007Publication date: October 11, 2007Applicant: L&L Engineering, LLCInventors: John C. Canfield, Paul W. Latham
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Publication number: 20070182610Abstract: Methods and systems for digital control.Type: ApplicationFiled: October 19, 2006Publication date: August 9, 2007Applicant: L&L Engineering, LLCInventors: Paul Latham, Stewart Kenly
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Publication number: 20070114985Abstract: A nonlinear PWM controller for switching power suppliesType: ApplicationFiled: November 10, 2006Publication date: May 24, 2007Applicant: L&L Engineering, LLCInventors: Paul Latham, John Canfield
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Publication number: 20070108953Abstract: Methods and systems for nonlinear control of switching power supplies.Type: ApplicationFiled: November 10, 2006Publication date: May 17, 2007Applicant: L&L Engineering, LLCInventor: Paul Latham
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Publication number: 20070108948Abstract: A method and apparatus for converting a DC voltage to a lower DC voltage, provides for conducting current from an input terminal, through an inductor to charge a capacitor connected to the inductor at an output terminal and to provide a varying range of load current from the output terminal, alternately switching the input terminal between a supply voltage and a ground potential to produce a desired voltage at the output terminal that is lower than the supply voltage, while providing the varying range of load current, and disconnecting the input terminal from both the supply voltage and the ground potential to reduce an increase in voltage at the output terminal caused by a substantial reduction in the load current, while current through the inductor adjusts in response to the reduced load current.Type: ApplicationFiled: November 10, 2006Publication date: May 17, 2007Applicant: L&L ENGINEERING, LLCInventors: Paul Latham, Stewart Kenly
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Publication number: 20070112443Abstract: Methods and systems for adaptive control.Type: ApplicationFiled: October 27, 2006Publication date: May 17, 2007Applicant: L&L Engineering, LLCInventors: Paul Latham, John Canfield