Jiandong D Jiang

US Patent:

7224218, May 29, 2007

Filed:

Jun 24, 2005

Appl. No.:

11/165637

Inventors:

Jiandong Jiang - The Colony TX, US
Lingli Zhang - Austin TX, US
Johann Gaboriau - Austin TX, US
John L. Melanson - Austin TX, US

Assignee:

Cirrus Logic, Inc. - Austin TX

International Classification:

H03F 3/38

US Classification:

330 10, 330251, 327132

Abstract:

A pre-charge apparatus and method for controlling startup transients in a capacitively-coupled switching power stage provide lower cost and improved startup transient performance in Class D amplifiers, as well as in other AC power converter applications. A charging source is activated at startup to control the charging of an external capacitor from a single power supply rail to an operating point voltage equal to the average DC output of the switching circuit, while a control circuit disables the output power stage of the switching converter. The current source may be a constant-current source and/or may be controlled via feedback from the voltage or current at the output terminal of the converter to taper the current level to more accurately control the charging. A discharge circuit can also be provided to discharge the output terminal to an opposite power supply rail before commencing the controlled charging.

US Patent:

20050047178, Mar 3, 2005

Filed:

Aug 27, 2003

Appl. No.:

10/649018

Inventors:

Jiandong Jiang - The Colony TX, US

International Classification:

H02M001/12

US Classification:

363041000

Abstract:

Disclosed are methods and apparatus for over-current detection in PWM power stages. Disclosed methods and apparatus provide over-current detection with adaptive filtering according to the pulse width of the PWM input signal. Methods and apparatus for their implementation are described for detecting the pulse width of a PWM signal in the PWM circuit. According to the detected pulse width, a digital delay less than the pulse width of the PWM signal is selected from among a plurality of available digital delays. Further, an over-current condition in the PWM power stage is detected. The detected over-current signal is filtered by means of the selected digital delay and an over-current detection result is output.

US Patent:

20160006336, Jan 7, 2016

Filed:

Jul 1, 2014

Appl. No.:

14/320747

Inventors:

- Dallas TX, US
Robert Henry Bell - Prescott AZ, US
Sang Yong Lee - Chandler AZ, US
Robert Kenneth Oppen - Phoenix AZ, US
Jiandong Jiang - Phoenix AZ, US

Assignee:

Texas Instruments Incorporated - Dallas TX

International Classification:

H02M 1/00
H02M 3/158

Abstract:

DC to DC converters and PWM controllers are presented in which a slope compensation ramp signal is provided for current control operation via a frequency adaptive compensation circuit with a phase locked loop that provides a control output signal having an amplitude generally proportional to the frequency of a clock signal, and a slope generator circuit generating the slope compensation ramp signal with an amplitude generally proportional to the control output signal amplitude.