Lin M Sheng

US Patent:

7872456, Jan 18, 2011

Filed:

Dec 16, 2008

Appl. No.:

12/335923

Inventors:

Xuening Li - Cary NC, US
Wei Dong - Cary NC, US
Lin Sheng - Raleigh NC, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

G05F 1/613
G05F 1/00

US Classification:

323224, 323288, 323283, 323284

Abstract:

One embodiment of the invention includes a power regulator system. The system includes a switching system configured to generate an output voltage across a load based on a high-side switch coupling a power voltage to an output at an edge-trigger of a PWM control signal having an activation pulse-width of the high-side switch. The system also includes a switch driver system configured to set a duty-cycle of the PWM control signal such that the activation pulse-width of the PWM control signal is based on the power regulator system operating in one of a continuous conduction mode (CCM) and a discontinuous conduction mode (DCM). The edge-trigger of the PWM control signal can occur based on a relative magnitude of the output voltage and the power voltage while operating in the DCM.

US Patent:

8054652, Nov 8, 2011

Filed:

Jan 30, 2008

Appl. No.:

12/022965

Inventors:

Rais K. Miftakhutdinov - Cary NC, US
Lin Sheng - Raleigh NC, US
John R. Wiggenhorn - Cary NC, US
Jin Liang - Apex NC, US
Steven Tumasz - Chichester NH, US
Hong Huang - Andover MA, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02M 3/335
H02M 3/24

US Classification:

363 2101, 363 98

Abstract:

Various embodiments of the present invention provide voltage converters and methods for using such. As one example, a voltage converter is disclosed that includes a transformer with a first winding and a second winding. A voltage is applied to the first winding for a period that is followed by an OFF time. The voltage converter further includes an OFF time controller that is operable to adjust the OFF time based at least in part on a load current traversing the second winding.

US Patent:

8134850, Mar 13, 2012

Filed:

Jan 30, 2008

Appl. No.:

12/022378

Inventors:

Rais K. Miftakhutdinov - Cary NC, US
Lin Sheng - Raleigh NC, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02M 7/5387
H02M 1/15
H02M 3/335

US Classification:

363 98, 363 17, 363 40

Abstract:

Various embodiments of the present invention provide voltage converters and methods for using such. As one example, a voltage converter is disclosed that includes a transformer, an operational detector, and a controllable oscillator. The transformer includes a first winding and a second winding, and the operational detector provides an electrical output corresponding to an operational characteristic of the transformer. The controllable oscillator provides a clock output with a frequency corresponding to the electrical output. This clock output at least in part controls application of a voltage input to the first winding.

US Patent:

8576596, Nov 5, 2013

Filed:

Oct 20, 2011

Appl. No.:

13/277773

Inventors:

Rais K. Miftakhutdinov - Cary NC, US
Lin Sheng - Raleigh NC, US
Jin Liang - Raleigh NC, US
John R. Wiggenhorn - Cary NC, US
Steven Tumasz - Chichester NH, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02M 7/44

US Classification:

363 98, 363 17

Abstract:

Various embodiments of the present invention provide voltage converters and methods for using such. As one example, a voltage converter is disclosed that includes a transformer with a first winding and a second winding. A voltage is applied to the first winding for a period that is followed by an OFF time. The voltage converter further includes an OFF time controller that is operable to adjust the OFF time based at least in part on a load current traversing the second winding.

US Patent:

20110205764, Aug 25, 2011

Filed:

May 28, 2010

Appl. No.:

12/789790

Inventors:

LIN SHENG - Raleigh NC, US
Xiaojun Xu - Raleigh NC, US

International Classification:

H02M 3/335

US Classification:

363 2109, 363 20

Abstract:

One embodiment of the invention relates to a switching control system for controlling an isolated power supply. The system includes a pulse-width modulation (PWM) switching controller configured to generate at least one primary switching signal having a first duty-cycle for activating at least one primary-side switch of the isolated power supply. A synchronous rectifier (SR) switching controller is configured to generate at least one SR switching signal having a second duty-cycle for activating at least one SR switch of the isolated power supply to conduct an output current through a secondary winding of a transformer and an output inductor to generate an output voltage, the second duty-cycle being independent of the first duty-cycle in a soft-start mode.

US Patent:

20170201171, Jul 13, 2017

Filed:

Jan 17, 2017

Appl. No.:

15/408101

Inventors:

- Dallas TX, US
Kening Gao - Shenzhen, CN
Lin Sheng - Raleigh NC, US
Danyang Zhu - Cary NC, US

International Classification:

H02M 1/36
H02M 3/335

Abstract:

A method includes comparing, by a voltage-second (VS) controller, a first duty cycle used to control a first switch at a primary side of a power transformer of a DC-to-DC converter with a threshold. The method further includes if a value of the first duty cycle is less than the threshold, controlling, by the VS controller, a second duty cycle used to control a second switch at a secondary side of the power transformer, and maintaining a voltage level at an output voltage node at a non-zero value, and if the value of the first duty cycle is greater than the threshold, controlling, by an output voltage loop, the second duty cycle based on the first duty cycle, and monotonically increasing the voltage level the at the output voltage node from the non-zero value to a predetermined value.