Patents by Inventor Luthuli E. Dake
Luthuli E. Dake 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: 9083252Abstract: A DC-DC converter includes a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter. A primary side diode models effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter. An output correction circuit controls a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode.Type: GrantFiled: October 23, 2012Date of Patent: July 14, 2015Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Erhan Ozalevli, David Daniels, Luthuli E. Dake
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Publication number: 20140112023Abstract: A DC-DC converter includes a primary side sense circuit to detect a load current of the DC-DC converter based on reflected current from a secondary winding of the DC-DC converter to a primary winding of the DC-DC converter. A primary side diode models effects of a secondary side diode that is driven from the secondary winding of the DC-DC converter. An output correction circuit controls a switching waveform to the primary winding of the DC-DC converter based on feedback from the primary side sense circuit and the primary side diode.Type: ApplicationFiled: October 23, 2012Publication date: April 24, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: ERHAN OZALEVLI, DAVID DANIELS, LUTHULI E. DAKE
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Patent number: 8044646Abstract: Various apparatuses, methods and systems for a voltage regulator are disclosed herein. For example, some embodiments provide an apparatus for regulating a voltage including an N-channel transistor that is connected between an input and an output, an error amplifier that is connected to the output, a capacitor that is connected between the error amplifier and a gate of the N-channel transistor, and a comparator that is connected to a node between the error amplifier and the capacitor. The apparatus also includes a charge pump that is switchably connected to the gate of the N-channel transistor. The apparatus is adapted to connect the charge pump to the gate of the N-channel transistor when a voltage at the node between the error amplifier and the capacitor rises above a threshold voltage.Type: GrantFiled: April 10, 2009Date of Patent: October 25, 2011Assignee: Texas Instruments IncorporatedInventors: Erhan Ozalevli, Luthuli E. Dake, Gregory Romas, Ching-yuh Tsay
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Patent number: 7982447Abstract: A switched mode power supply has a high side switching transistor coupled between a voltage source and a load for generating the output voltage at the load. A driver circuit drives the high side switching transistor. A first resistor divider is coupled to the output voltage and has a first tap. An error amplifier has a first input coupled to the first tap and a compensated feedback loop. A second resistor divider is coupled to the output voltage and has a second tap, resistance of the second resistor divider being less than resistance of the first resistor divider. A switch is coupled to the second tap and to the first input of the error amplifier for connecting the second tap to the first input of the error amplifier when the output voltage of the switched mode power supply reaches a first predetermined voltage.Type: GrantFiled: December 15, 2008Date of Patent: July 19, 2011Assignee: Texas Instruments IncorporatedInventors: Shanmuganand Chellamuthu, James A. Kohout, Luthuli E. Dake
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Publication number: 20100259235Abstract: Various apparatuses, methods and systems for a voltage regulator are disclosed herein. For example, some embodiments provide an apparatus for regulating a voltage including an N-channel transistor that is connected between an input and an output, an error amplifier that is connected to the output, a capacitor that is connected between the error amplifier and a gate of the N-channel transistor, and a comparator that is connected to a node between the error amplifier and the capacitor. The apparatus also includes a charge pump that is switchably connected to the gate of the N-channel transistor. The apparatus is adapted to connect the charge pump to the gate of the N-channel transistor when a voltage at the node between the error amplifier and the capacitor rises above a threshold voltage.Type: ApplicationFiled: April 10, 2009Publication date: October 14, 2010Inventors: Erhan Ozalevli, Luthuli E. Dake, Gregory Romas, Ching-yuh Tsay
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Publication number: 20100156384Abstract: Methods and apparatus for higher-order correction of bandgap voltage references are disclosed. An example bandgap voltage reference circuit disclosed herein comprises a bandgap voltage generation circuit comprising a first resistor, the bandgap voltage generation circuit configured to generate a proportional-to-absolute-temperature current to drive the first resistor to produce a first voltage, the first voltage contributing to an output bandgap voltage, and a first correction circuit electrically coupled to the first resistor and configured to provide a first correction current, the first correction circuit comprising a first nonlinear device configured to generate the first correction current only within a first temperature range, the first correction current decreasing with increasing temperature, the first correction current to drive the first resistor to increase the first voltage only within the first temperature range.Type: ApplicationFiled: December 18, 2008Publication date: June 24, 2010Inventors: Erhan Ozalevli, Luthuli E. Dake, Gregory Romas, Gary L. Wakeman
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Patent number: 7728575Abstract: Methods and apparatus for higher-order correction of bandgap voltage references are disclosed. An example bandgap voltage reference circuit disclosed herein comprises a bandgap voltage generation circuit comprising a first resistor, the bandgap voltage generation circuit configured to generate a proportional-to-absolute-temperature current to drive the first resistor to produce a first voltage, the first voltage contributing to an output bandgap voltage, and a first correction circuit electrically coupled to the first resistor and configured to provide a first correction current, the first correction circuit comprising a first nonlinear device configured to generate the first correction current only within a first temperature range, the first correction current decreasing with increasing temperature, the first correction current to drive the first resistor to increase the first voltage only within the first temperature range.Type: GrantFiled: December 18, 2008Date of Patent: June 1, 2010Assignee: Texas Instruments IncorporatedInventors: Erhan Ozalevli, Luthuli E. Dake, Gregory Romas, Gary L. Wakeman
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Publication number: 20090206810Abstract: A switched mode power supply has a high side switching transistor coupled between a voltage source and a load for generating the output voltage at the load. A driver circuit drives the high side switching transistor. A first resistor divider is coupled to the output voltage and has a first tap. An error amplifier has a first input coupled to the first tap and a compensated feedback loop. A second resistor divider is coupled to the output voltage and has a second tap, resistance of the second resistor divider being less than resistance of the first resistor divider. A switch is coupled to the second tap and to the first input of the error amplifier for connecting the second tap to the first input of the error amplifier when the output voltage of the switched mode power supply reaches a first predetermined voltage.Type: ApplicationFiled: December 15, 2008Publication date: August 20, 2009Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Shanmuganand Chellamuthu, James A. Kohout, Luthuli E. Dake
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Patent number: 7548097Abstract: One embodiment of the invention includes a power driver system. The power driver system comprises a power transistor that is activated to provide power to a load and a switching circuit configured to control the power transistor based on a control signal. The power driver system further comprises a control circuit configured to detect a flyback current from the load upon deactivation of the power transistor and to cause the switching circuit to steer the flyback current from a first flyback current path to a second flyback current path in response to detecting the flyback current path. The second flyback current path can have an impedance that is greater than the first flyback current path.Type: GrantFiled: October 23, 2007Date of Patent: June 16, 2009Assignee: Texas Instruments IncorporatedInventors: Luthuli E. Dake, Bernard Wicht, Michael Herbert Wendt
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Publication number: 20090102547Abstract: One embodiment of the invention includes a power driver system. The power driver system comprises a power transistor that is activated to provide power to a load and a switching circuit configured to control the power transistor based on a control signal. The power driver system further comprises a control circuit configured to detect a flyback current from the load upon deactivation of the power transistor and to cause the switching circuit to steer the flyback current from a first flyback current path to a second flyback current path in response to detecting the flyback current path. The second flyback current path can have an impedance that is greater than the first flyback current path.Type: ApplicationFiled: October 23, 2007Publication date: April 23, 2009Inventors: LUTHULI E. DAKE, Bernard Wicht, Michael Herbert Wendt