Hang G Li

US Patent:

20180019672, Jan 18, 2018

Filed:

Jul 15, 2016

Appl. No.:

15/211545

Inventors:

- Round Rock TX, US
Hang Li - Austin TX, US
Kejiu Zhang - Round Rock TX, US

International Classification:

H02M 3/158
H02M 1/34

Abstract:

A voltage regulator includes circuitry for regulating a voltage output of the voltage regulator and a snubber circuit. The snubber circuit includes a switching device which is controlled to electronically connect or disconnect the snubber circuit with the circuitry of the voltage regulator device. The switching device may be controlled by a controller based on one or more parameters indicating a load of the voltage regulator device.

US Patent:

20170255251, Sep 7, 2017

Filed:

Mar 3, 2016

Appl. No.:

15/060312

Inventors:

- Round Rock TX, US
Shiguo Luo - Austin TX, US
Hang Li - Austin TX, US

International Classification:

G06F 1/32
G06F 1/26

Abstract:

A voltage regulator for delivering power to a processor subsystem within an information handling system is disclosed. The voltage regulator includes an interface to an embedded controller for receiving a linear load line impedance and an intelligent load line controller. The intelligent load line controller may enable linear load line control, determine that a nonlinear load line condition is satisfied, and enable nonlinear load line control based on the determination that the nonlinear load line condition is satisfied.

US Patent:

20160204604, Jul 14, 2016

Filed:

Feb 26, 2016

Appl. No.:

15/054814

Inventors:

- Round Rock TX, US
Shiguo Luo - Austin TX, US
Hang Li - Austin TX, US

Assignee:

Dell Products L.P. - Round Rock TX

International Classification:

H02J 1/00
H02M 3/158

Abstract:

A voltage regulator may comprise a high-side switch and a low-side switch for delivering electrical current to the at least one information handling resource, a high-side driver configured to drive a high-side driving voltage for regulating a first electrical current of the high-side switch, a low-side driver configured to drive a low-side driving voltage for regulating a second electrical current of the low-side switch, and a control circuit configured to operate the at least one voltage regulator in both of a fixed dead time mode and an adaptive dead time mode.

US Patent:

20160105101, Apr 14, 2016

Filed:

Oct 10, 2014

Appl. No.:

14/512069

Inventors:

- Round Rock TX, US
Shiguo Luo - Austin TX, US
Wayne Kenneth Cook - Round Rock TX, US
Mehran Mirjafari - Austin TX, US
Hang Li - Austin TX, US
Kejiu Zhang - Round Rock TX, US
Lei Wang - Austin TX, US

International Classification:

H02M 3/156
H02M 1/42

Abstract:

In accordance with embodiments of the present disclosure, a power supply unit may include one or more stages including an output stage configured to generate a direct-current output voltage at an output of the power supply, an OR-ing metal-oxide-semiconductor field effect transistor (MOSFET) coupled between the output stage and the output, and a controller. The controller may be configured to measure a signal indicative of a voltage associated with the OR-ing MOSFET and determine an estimated output current of the power supply based on the signal.

US Patent:

20160094122, Mar 31, 2016

Filed:

Dec 9, 2015

Appl. No.:

14/963903

Inventors:

Shiguo Luo - Austin TX, US
Kejiu Zhang - Round Rock TX, US
Hang Li - Austin TX, US

International Classification:

H02M 3/157
H02M 1/36

Abstract:

Methods and systems are disclosed that may be employed to improve efficiency of smart integrated power stages (IPstages) of multi-phase VR systems while operating under relatively light, ultra-light, or partial or reduced loads. The disclosed methods and systems may be implemented to improve VR system light load efficiency by providing and enabling reduced power IPstage operating modes in one or more smart IPstage/s of a VR system, and by enabling state transition between IPstage active and reduced power operating modes such as IPstage standby and IPstage hibernation modes.

US Patent:

20150370300, Dec 24, 2015

Filed:

Aug 27, 2014

Appl. No.:

14/470217

Inventors:

Shiguo Luo - Austin TX, US
Kejiu Zhang - Round Rock TX, US
Hang Li - Austin TX, US
John J. Breen - Harker Heights TX, US

International Classification:

G06F 1/28
G06F 12/02

Abstract:

Methods and systems are disclosed that may be employed to enable multi-phase voltage regulator (VR) system calibration during the development phase of a multi-phase VR system so as to meet defined accuracy targets and, in one example, to avoid the need for system level calibration in a production environment. The disclosed systems and methods may be further implemented to enable use of multiple sources for and types of integrated power stages (IPstages) in a common multi-phase VR system configuration while still achieving the required current sense accuracy, thus reducing or substantially eliminating continuity of supply (COS) concerns. The disclosed methods and systems may also be implemented to improve accuracy of current sense in a manner that improves VR system performance, power saving and reliability.

US Patent:

20150372597, Dec 24, 2015

Filed:

Aug 27, 2014

Appl. No.:

14/470344

Inventors:

Shiguo Luo - Austin TX, US
Kejiu Zhang - Round Rock TX, US
Hang Li - Austin TX, US

International Classification:

H02M 3/158

Abstract:

Methods and systems are disclosed that may be employed to improve efficiency of smart integrated power stages (IPstages) of multi-phase VR systems while operating under relatively light, ultra-light, or partial or reduced loads. The disclosed methods and systems may be implemented to improve VR system light load efficiency by providing and enabling reduced power IPstage operating modes in one or more smart IPstage/s of a VR system, and by enabling state transition between IPstage active and reduced power operating modes such as IPstage standby and IPstage hibernation modes.

US Patent:

20150323572, Nov 12, 2015

Filed:

Jul 17, 2015

Appl. No.:

14/802858

Inventors:

- Round Rock TX, US
Hang Li - Austin TX, US

International Classification:

G01R 19/25
G01R 31/40
G01R 35/00

Abstract:

A system and method of measuring real-time current is disclosed. The method includes calibrating a voltage measurement device. Calibrating includes measuring a real-time voltage difference between a first measurement node located proximate a first connector on a motherboard and a second measurement node located proximate a second connector on a power supply unit (PSU), the first and the second connectors coupled to provide power to the motherboard. Calibrating further includes averaging the real-time voltage difference for a plurality of measurements; computing a resistance of the coupling based at least on a long-duration averaged current from the PSU and the averaged real-time voltage difference, the resistance varying over time; and reporting the resistance of the coupling to the voltage measurement device. The method also includes measuring a real-time current of the PSU at the voltage measurement device based at least on the resistance of the coupling and the real-time voltage difference.