Xiao Yin 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:

63113562, Nov 6, 2001

Filed:

Aug 10, 1999

Appl. No.:

9/371653

Inventors:

Xiao Chun Wang - Diamond Bar CA

International Classification:

A47L 1102

US Classification:

15 99

Abstract:

A floor cleaner includes a chassis having an elevator mechanism, caster wheels, and a pair of main wheels; a tank removably supported by the chassis for holding cleaning liquid; and a carpet belt. Laterally oriented rollers are supported by the chassis for supporting the carpet belt in a closed path, including a cleaning roller for submerging a portion of the carpet belt within the tank, front and rear wringer rollers, front and rear press rollers, front and rear platen rollers, and an idler roller. A platen member presses the carpet belt against the floor surface. A roller drive rotatably couples the front platen roller to the main wheels for regulating a rate of advancement of the carpet belt during longitudinal movement of the apparatus when the elevator mechanism is in a normal position. The cleaning roller has a raised position clear of the tank, which can be slid on tracks laterally out of the chassis for facilitating lifting of the tank clear of the chassis. The elevator mechanism has a second position for raising the main wheels clear of the floor, and a service position wherein at least one of the main wheels is moved clear of a removal path of the tank.

US Patent:

58708790, Feb 16, 1999

Filed:

Dec 16, 1996

Appl. No.:

8/767210

Inventors:

Xiao Chun Wang - Diamond Bar CA

International Classification:

B65B 500
B65B 4326
B65B 6106
B65B 6300

US Classification:

53 55

Abstract:

A film sleever machine includes a first stepper motor for activating a sleeve delivery device which has a driving shaft and a roller shaft mounted parallelly for feeding a film wearing bag material. A film feeding device which has a film driving wheel and a pressure wheel is activated by a second stepper motor for feeding a roll of film to insert into a plurality of film wearing sleeve of the film wearing bag material. The first stepper motor also activates a film cutter device to cut off the film. The second stepper motor also activates a sleeve cutter device to cut off the film wearing bag material. Accordingly, the film sleever machine can be operated to feed the film, cut the film, feed the sleeves, and cut off the sleeves automatically.

US Patent:

59339004, Aug 10, 1999

Filed:

May 28, 1997

Appl. No.:

8/864957

Inventors:

Xiao Chun Wang - Diamond Bar CA

International Classification:

A47L 1103
A47L 11292

US Classification:

15 503

Abstract:

Apparatus for cleaning a floor surface includes a chassis having a frame, an elevator mechanism, and a plurality of ground-contacting wheels; a tank supported by the chassis for holding a quantity of cleaning liquid; a sweeper module removably connectable to the chassis; and a carpet belt member. A plurality of laterally oriented rollers are supported by the chassis for supporting the carpet belt member in a closed path, including a cleaning roller for submerging a portion of the carpet belt within the tank, first and second wringer rollers, first and second press rollers, an adjustment roller for tensioning the carpet roller, an idler roller, and a drive roller. An insert member is supported by the chassis, the cleaning roller and the press roller being supported by the insert member. A main handle pivotally mounted to the insert member manipulates the apparatus on the floor surface. A roller drive rotatably couples the drive roller to at least one of the wheels for regulating a rate of advancement of the carpet belt during longitudinal movement of the apparatus.

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:

20190392483, Dec 26, 2019

Filed:

Aug 29, 2019

Appl. No.:

16/555801

Inventors:

- Menlo Park CA, US
Xiao Ou Wang - San Francisco CA, US

International Classification:

G06Q 30/02
G06Q 50/00

Abstract:

Techniques for context sensitive overlays, comprising a social networking application. The social networking application may include, among other components, a social networking overlay management component to receive a request from a mobile device to determine a list of aggregate overlay information and user context information, and providing the list of aggregate overlay information and user context information to the mobile device, a context determination component to determine the user context information representative of at least one user context based at least partially on user profile information, location information, calendar event information, and/or external event information, and an overlay selection component to generate the list of aggregate overlay information based at least partially on the user profile information, overlay promotion information, and user context information

US Patent:

20190384464, Dec 19, 2019

Filed:

Aug 30, 2019

Appl. No.:

16/557730

Inventors:

- Menlo Park CA, US
Xiao Ou Wang - San Francisco CA, US
Kent Fu Ho Tam - Redwood City CA, US

International Classification:

G06F 3/0482
H04M 1/725
G06F 16/9535

Abstract:

Techniques for context sensitive illustrated graphical user interface elements, comprising a social networking application. The social networking application may include, among other components, a social networking graphical elements management component to provide a list of recommended graphical element identifier information, in response to a request for the list of recommended graphical element identifier information, a context determination component to determine user context information representative of the at least one user context based at least partially on user communications intent information, user profile information, device location information, calendar event information, and/or external event information, and a graphical elements recommendation component to generate the list of recommended graphical element identifier information based at least partially on the user profile information, graphical elements promotion information, and/or the user context information.