Patents by Inventor James M. Walden
James M. Walden 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).
-
Patent number: 12081134Abstract: Disclosed examples include flyback converters, control circuits and methods to facilitate secondary side regulation of the output voltage. A primary side control circuit operates a primary side switch to independently initiate power transfer cycles to deliver power to a transformer secondary winding in a first mode. A secondary side control circuit operates a synchronous rectifier or secondary side switch to generate a predetermined cycle start request signal via a transformer auxiliary winding to assume secondary side regulation and to cause the primary side controller to initiate new power transfer cycles.Type: GrantFiled: June 19, 2023Date of Patent: September 3, 2024Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Satish Kumar Vemuri, James M. Walden, Isaac Cohen
-
Patent number: 12028066Abstract: In a transistor turnoff system, a transistor control circuit is configured to adjust a control voltage at a transistor control output responsive to a comparison signal at a control input. The control voltage has a slew rate. A comparator has a comparator output and first and second comparator inputs. The first comparator input is coupled to the transistor control output. The comparator is configured to: provide the comparison signal at the comparator output based on a reference voltage at the second comparator input; and deactivate the transistor control circuit by changing a state of the comparison signal responsive to the control voltage falling below the reference voltage. A slew-rate compensator is configured to increase the reference voltage by a compensation voltage that compensates for a time delay of the comparator or the transistor control circuit. The compensation voltage is proportional to the slew rate.Type: GrantFiled: April 27, 2023Date of Patent: July 2, 2024Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Kyoung Min Lee, James M. Walden, Brian Linehan, Yang Zhang
-
Publication number: 20240197298Abstract: An instrument for use in the gastrointestinal tract of a patient comprises a sleeve, an endoscope, a vacuum tube alternatively reciprocal relative to the sleeve and a switching block to control alternative insertions of the endoscope and vacuum tube into the sleeve while directing them into position.Type: ApplicationFiled: June 28, 2023Publication date: June 20, 2024Inventors: Sharon A. Hibbs, Michael McGee, Thomas Shireman, James M. Walden, JR.
-
Publication number: 20230336089Abstract: Disclosed examples include flyback converters, control circuits and methods to facilitate secondary side regulation of the output voltage. A primary side control circuit operates a primary side switch to independently initiate power transfer cycles to deliver power to a transformer secondary winding in a first mode. A secondary side control circuit operates a synchronous rectifier or secondary side switch to generate a predetermined cycle start request signal via a transformer auxiliary winding to assume secondary side regulation and to cause the primary side controller to initiate new power transfer cycles.Type: ApplicationFiled: June 19, 2023Publication date: October 19, 2023Inventors: Satish Kumar Vemuri, James M. Walden, Isaac Cohen
-
Publication number: 20230261657Abstract: In a transistor turnoff system, a transistor control circuit is configured to adjust a control voltage at a transistor control output responsive to a comparison signal at a control input. The control voltage has a slew rate. A comparator has a comparator output and first and second comparator inputs. The first comparator input is coupled to the transistor control output. The comparator is configured to: provide the comparison signal at the comparator output based on a reference voltage at the second comparator input; and deactivate the transistor control circuit by changing a state of the comparison signal responsive to the control voltage falling below the reference voltage. A slew-rate compensator is configured to increase the reference voltage by a compensation voltage that compensates for a time delay of the comparator or the transistor control circuit. The compensation voltage is proportional to the slew rate.Type: ApplicationFiled: April 27, 2023Publication date: August 17, 2023Inventors: Kyoung Min Lee, James M. Walden, Brian Linehan, Yang Zhang
-
Patent number: 11722067Abstract: Disclosed examples include flyback converters, control circuits and methods to facilitate secondary side regulation of the output voltage. A primary side control circuit operates a primary side switch to independently initiate power transfer cycles to deliver power to a transformer secondary winding in a first mode. A secondary side control circuit operates a synchronous rectifier or secondary side switch to generate a predetermined cycle start request signal via a transformer auxiliary winding to assume secondary side regulation and to cause the primary side controller to initiate new power transfer cycles.Type: GrantFiled: May 23, 2018Date of Patent: August 8, 2023Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Satish Kumar Vemuri, James M. Walden, Isaac Cohen
-
Patent number: 11671098Abstract: In a transistor turnoff system, a transistor control circuit is configured to adjust a control voltage at a transistor control output responsive to a comparison signal at a control input. The control voltage has a slew rate. A comparator has a comparator output and first and second comparator inputs. The first comparator input is coupled to the transistor control output. The comparator is configured to: provide the comparison signal at the comparator output based on a reference voltage at the second comparator input; and deactivate the transistor control circuit by changing a state of the comparison signal responsive to the control voltage falling below the reference voltage. A slew-rate compensator is configured to increase the reference voltage by a compensation voltage that compensates for a time delay of the comparator or the transistor control circuit. The compensation voltage is proportional to the slew rate.Type: GrantFiled: March 21, 2022Date of Patent: June 6, 2023Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Kyoung Min Lee, James M. Walden, Brian Linehan, Yang Zhang
-
Publication number: 20220216872Abstract: In a transistor turnoff system, a transistor control circuit is configured to adjust a control voltage at a transistor control output responsive to a comparison signal at a control input. The control voltage has a slew rate. A comparator has a comparator output and first and second comparator inputs. The first comparator input is coupled to the transistor control output. The comparator is configured to: provide the comparison signal at the comparator output based on a reference voltage at the second comparator input; and deactivate the transistor control circuit by changing a state of the comparison signal responsive to the control voltage falling below the reference voltage. A slew-rate compensator is configured to increase the reference voltage by a compensation voltage that compensates for a time delay of the comparator or the transistor control circuit. The compensation voltage is proportional to the slew rate.Type: ApplicationFiled: March 21, 2022Publication date: July 7, 2022Inventors: Kyoung Min Lee, James M. Walden, Brian Linehan, Yang Zhang
-
Publication number: 20180269797Abstract: Disclosed examples include flyback converters, control circuits and methods to facilitate secondary side regulation of the output voltage. A primary side control circuit operates a primary side switch to independently initiate power transfer cycles to deliver power to a transformer secondary winding in a first mode. A secondary side control circuit operates a synchronous rectifier or secondary side switch to generate a predetermined cycle start request signal via a transformer auxiliary winding to assume secondary side regulation and to cause the primary side controller to initiate new power transfer cycles.Type: ApplicationFiled: May 23, 2018Publication date: September 20, 2018Inventors: Satish Kumar Vemuri, James M. Walden, Isaac Cohen
-
Patent number: 10008947Abstract: Disclosed examples include flyback converters, control circuits and methods to facilitate secondary side regulation of the output voltage. A primary side control circuit operates a primary side switch to independently initiate power transfer cycles to deliver power to a transformer secondary winding in a first mode. A secondary side control circuit operates a synchronous rectifier or secondary side switch to generate a predetermined cycle start request signal via a transformer auxiliary winding to assume secondary side regulation and to cause the primary side controller to initiate new power transfer cycles.Type: GrantFiled: July 6, 2016Date of Patent: June 26, 2018Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Satish Kumar Vemuri, James M. Walden, Isaac Cohen
-
Publication number: 20170033698Abstract: Disclosed examples include flyback converters, control circuits and methods to facilitate secondary side regulation of the output voltage. A primary side control circuit operates a primary side switch to independently initiate power transfer cycles to deliver power to a transformer secondary winding in a first mode. A secondary side control circuit operates a synchronous rectifier or secondary side switch to generate a predetermined cycle start request signal via a transformer auxiliary winding to assume secondary side regulation and to cause the primary side controller to initiate new power transfer cycles.Type: ApplicationFiled: July 6, 2016Publication date: February 2, 2017Applicant: Texas Instruments IncorporatedInventors: Satish Kumar Vemuri, James M. Walden, Isaac Cohen