Xiao Wu Wang

US Patent:

7974107, Jul 5, 2011

Filed:

Aug 27, 2008

Appl. No.:

12/199471

Inventors:

Yong Li - Campbell CA, US
Junjie Zheng - Santa Clara CA, US
Liang Yan - Campbell CA, US
John Kesterson - San Jose CA, US
Xiao Yan Wang - Pleasanton CA, US

Assignee:

iWatt Inc. - Los Gatos CA

International Classification:

H02M 3/335

US Classification:

363 2101, 363 2108, 363 2116, 363 2112

Abstract:

A hybrid constant current control system that uses both pulse width modulation (PWM) and pulse frequency modulation (PFM) control. When transitioning from constant voltage mode to constant current mode the present invention can continue to control using PWM. Thereafter, when the voltage has dropped, the present invention smoothly transitions to PFM mode. The point of transition is based upon the switching frequency and the lowest rated voltage of operation. The system and method avoids very short (narrow) Ton times which ensures accurate constant current (CC) control with bipolar junction transistor (BJT) devices. The present invention also avoids acoustic noise because the switching frequency is maintained at a high enough level to avoid such acoustic noise even when the energy transferred through the transformer is still substantial and the output voltage is not too low. In addition the output current limit is insensitive to variation in the inductance-input voltage ratio, and is minimized against leakage inductance.

US Patent:

20050238068, Oct 27, 2005

Filed:

Apr 27, 2004

Appl. No.:

10/832560

Inventors:

Suning Tang - Fremont CA, US
Xiao Wang - San Jose CA, US

International Classification:

H01S003/10

US Classification:

372020000

Abstract:

A method and apparatus for generating frequency tunable radio-frequency (RF) pulses utilizing a tunable cavity solid-state laser are disclosed. In one preferred embodiment, an optical RF source provides optical pulses with 1 to 200 GHz repetition rate. The disclosed optical RF source consists of a pump laser and mode matching optics, a pump beam coupler, a laser cavity end mirror, a laser gain medium, a Saturable Bragg Reflector, and a mechanism to change the effective optical length of the laser cavity. By adjusting the effective optical cavity length between the cavity end mirror that also serves as laser output coupler and Saturable Bragg Reflector that also serves as the other end mirror of the cavity, the repetition rate of the output optical pulses is changed. In another preferred embodiment, an optical RF source consists of a pump laser and mode matching optics, a Saturable Bragg Reflector that also serves as a pump coupler, a laser cavity end mirror that also serves as laser output coupler, a laser gain medium, and a mechanism to change the effective optical length of the laser cavity. By adjusting the effective optical cavity length between the cavity end mirror and Saturable Bragg Reflector, the repetition rate of the output optical pulses is changed. In yet another preferred embodiment, an optical RF source further includes an optical to electrical signal converter, and at least one of the following: a RF connector, a connecting waveguide, and a coaxial transmission cable with at least one terminating, impedance matching resistor. In an additional preferred embodiment, an optical RF source consists of a pump laser and mode matching optics, a Saturable Bragg Reflector that also serves as an output coupler and laser cavity end mirror, a second laser cavity end mirror also serving as pump coupler, a laser gain medium, and a mechanism to change the effective optical cavity length of the laser. By adjusting the effective optical cavity length between the cavity end mirrors, the repetition rate of the output optical pulses is changed.

US Patent:

20220322263, Oct 6, 2022

Filed:

Apr 1, 2021

Appl. No.:

17/220893

Inventors:

- San Diego CA, US
Le Liu - Fremont CA, US
Alberto Rico Alvarino - San Diego CA, US
Xiao Feng Wang - San Diego CA, US
Mungal Singh Dhanda - Slough, GB
Jun Ma - San Diego CA, US
Peter Gaal - San Diego CA, US
Bharat Shrestha - San Diego CA, US
Liangping Ma - San Diego CA, US
Umesh Phuyal - San Diego CA, US

International Classification:

H04W 56/00
H04B 7/185
H04W 72/04

Abstract:

Methods, systems, and devices for wireless communications are described in which UEs may communicate with satellites or base stations, or both in a non-terrestrial network. Due to large distances between transmitting devices and receiving devices in a non-terrestrial network, the UE may account for propagation delay and frequency shift of communications with a satellite based on location information of the satellite. The UE may receive first satellite location information from a base station or a satellite, via a broadcast message. The UE may receive second satellite location information from the wireless network node via a unicast message, where both the first satellite location information and the second satellite location information relate to a same satellite. The UE may transmit an uplink communication via the satellite based on at least one of the first satellite location information or the second satellite location information.

US Patent:

20190288888, Sep 19, 2019

Filed:

May 30, 2019

Appl. No.:

16/427045

Inventors:

- San Diego CA, US
Chun-Hao HSU - San Jose CA, US
Xiao Feng WANG - San Diego CA, US
Peter GAAL - San Diego CA, US
Lei XIAO - San Jose CA, US

International Classification:

H04L 27/20
H04L 27/26
H04L 5/00
H04W 4/70

Abstract:

In order to enable a UE receiving a narrowband signal transmitted using in-band resources to use the LTE reference signals to assist the UE in receiving the narrowband signal using an in-band deployment, a phase rotation employed by the base station may be fixed relative to a known reference position in time. An apparatus for wireless communication at a base station may determine a phase offset for a narrowband signal for transmission using wideband resources, the phase offset having a relationship to a reference point in time and transmit the narrowband signal using the determined phase offset. An apparatus for wireless communication at a UE may receive a narrowband signal having a frequency location within a wideband signal and rotate a symbol of the wideband signal by a per symbol phase offset having a relationship of the phase offset to a reference point in time.

US Patent:

20180054340, Feb 22, 2018

Filed:

Feb 28, 2017

Appl. No.:

15/445263

Inventors:

- San Diego CA, US
Chun-Hao HSU - San Jose CA, US
Xiao Feng WANG - San Diego CA, US
Peter GAAL - San Diego CA, US
Lei XIAO - San Jose CA, US

International Classification:

H04L 27/20
H04W 4/00

Abstract:

In order to enable a UE receiving a narrowband signal transmitted using in-band resources to use the LTE reference signals to assist the UE in receiving the narrowband signal using an in-band deployment, a phase rotation employed by the base station may be fixed relative to a known reference position in time. An apparatus for wireless communication at a base station may determine a phase offset for a narrowband signal for transmission using wideband resources, the phase offset having a relationship to a reference point in time and transmit the narrowband signal using the determined phase offset. An apparatus for wireless communication at a UE may receive a narrowband signal having a frequency location within a wideband signal and rotate a symbol of the wideband signal by a per symbol phase offset having a relationship of the phase offset to a reference point in time.

US Patent:

20180016411, Jan 18, 2018

Filed:

Jul 15, 2016

Appl. No.:

15/211661

Inventors:

Xiao Wang - Houston TX, US
Ping Duan - Cypress TX, US
Anil K. Sadana - Houston TX, US

Assignee:

Baker Hughes Incorporated - Houston TX

International Classification:

C08K 3/30
C08G 18/42
C08G 18/10
C08G 18/76
E21B 34/06
E21B 33/12

Abstract:

A degradable polymer composite comprises a polyurethane comprising one or more of the following groups: ester groups; carbonate groups; or ether groups, in a backbone of the polyurethane; and about 1 to about 30 parts by weight of an acidic or basic powder comprising particles having an average size of about 5 microns to about 1 millimeter per 100 parts of the polyurethane.

US Patent:

20170249594, Aug 31, 2017

Filed:

Feb 26, 2016

Appl. No.:

15/055055

Inventors:

- Mountain View CA, US
Ada Cheuk Ying Yu - Santa Clara CA, US
Xiao Yu Wang - Santa Clara CA, US

International Classification:

G06Q 10/10
G06Q 50/00
G06F 17/30

Abstract:

A system filters profiles of an online business network as a function of recent college graduates who have recently become employed in first employment positions, and identifies codes associated with the first employment positions. The system filters job listings using the identified codes to identify job listings that are closed and similar to the first employment positions. The system stores the identified job listings that are similar to the first employment positions into a first subset of job listings, and analyzes the job descriptions in the first subset of job listings using a logistic regression to model job listings with predictor variables indicating whether the requirements expressed in the job descriptions—for example, requirements of previous work experience—are likely optional or mandatory. The system stores open job listings classified by the model as likely having optional requirements or mandatory requirements into a second subset of job listings, and displays the second subset of job listings to help recent college graduates with their job search.

US Patent:

20170152371, Jun 1, 2017

Filed:

Nov 30, 2015

Appl. No.:

14/953472

Inventors:

Ping Duan - Cypress TX, US
Anil K. Sadana - Houston TX, US
Suman Khatiwada - Houston TX, US
Yingqing Xu - Tomball TX, US
Xiao Wang - Houston TX, US

Assignee:

Baker Hughes Incorporated - Houston TX

International Classification:

C08K 7/14
E21B 41/00
B29C 43/00

Abstract:

A degradable polymer composition comprises a polyurethane comprising ester groups in a backbone of the polyurethane and carboxylic acid groups attached to the backbone of the polyurethane; and a filler comprising one or more of the following: a powder comprising particles having an average particle size of about 5 microns to about 500 microns; or a fiber having an average length of about ⅛ inch to about 5 inches. Also disclosed are articles comprising the composition. A method to degrade the article includes exposing the article to a fluid at a temperature of about 25 C. to about 300 C.