Wei C Sandra C Chen

US Patent:

6462525, Oct 8, 2002

Filed:

Nov 29, 2001

Appl. No.:

09/995701

Inventors:

Wei Chen - Campbell CA

Assignee:

Linear Technology Corp. - Milpitas CA

International Classification:

G05F 140

US Classification:

323285, 323282

Abstract:

A multi-phase multi-channel voltage regulator having high efficiency at light loads is provided. The regulator increases efficiency at light loads by shutting down a select channel of the regulator. In addition, the regulator may place remaining channels in Burst Mode.

US Patent:

6593724, Jul 15, 2003

Filed:

Aug 1, 2001

Appl. No.:

09/920463

Inventors:

Wei Chen - Campbell CA

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

G05F 140

US Classification:

323283, 323272

Abstract:

A multi-phase multi-channel voltage regulator having high efficiency at light loads is provided. The regulator increases efficiency at light loads by shutting down a select channel of the regulator. In addition, the regulator may place remaining channels in Burst Mode.

US Patent:

6803752, Oct 12, 2004

Filed:

Feb 14, 2000

Appl. No.:

09/503549

Inventors:

Wei Chen - Campbell CA

Assignee:

Linear Technology Corporation - Milpitas CA

International Classification:

G05F 140

US Classification:

323282, 323272

Abstract:

A multi-phase multi-channel voltage regulator having high efficiency at light loads is provided. The regulator increases efficiency at light loads by shutting down a select channel of the regulator. In addition, the regulator may place remaining channels in Burst Mode.

US Patent:

7155285, Dec 26, 2006

Filed:

Dec 11, 2003

Appl. No.:

10/733139

Inventors:

Xiaoming Wang - Rancho Santa Margarita CA, US
Huijian Zou - Shenzhen, Guangdong, CN
Wei Chen - Rancho Santa Margarita CA, US

International Classification:

A61N 1/18

US Classification:

607 45, 607 39, 607 40, 600 26

Abstract:

Alpha rhythm brain waves are related to mental and physical relaxation and healing. Based on the studies of bionics, this invention relates to inducing oscillatory alpha rhythm to the human body, and relates to the means of the alpha rhythm machine applied to human body. Research of the alpha rhythm of human brain wave patterns and EEG has indicated special recorded data of alpha rhythm brain waveform which is the bearing of the proper biological information of relaxing and healing. The apparatus was developed and built to construct and release the simulated human brain alpha rhythm signals which are at the frequencies ranging 8 Hz–14 Hz and at the amplitudes altered in high or low. Both the frequencies and the amplitudes are changing at a non-stationary random order in the duration of the event, respectively. The electrical signals are transformed via a transducer, into three forms of energy, 1, alpha rhythm electromagnetic energy and alpha rhythm interfering static magnetic energy; 2, alpha rhythm sub-audio acoustic oscillatory energy; and 3, alpha rhythm mechanical vibrational energy. The combining energies from the apparatus can benefit the whole human body or only the area affected by illness, for example, treating men's prostate problems or treating sleep disorders.

US Patent:

7161305, Jan 9, 2007

Filed:

May 19, 2004

Appl. No.:

10/850351

Inventors:

Wei Chen - Campbell CA, US

Assignee:

Monolithic Power Systems, Inc. - Los Gatos CA

International Classification:

H05B 37/02

US Classification:

315209R, 315219, 315307

Abstract:

The present disclosure introduces a simple method and apparatus for converting DC power to AC power, and, specifically, to single-ended inverter circuits for driving discharge lamps such as a Cold Cathode Fluorescent Lamp (CCFL) or an External Electrode Fluorescent Lamp (EEFL). Among other advantages, these circuits offer nearly symmetrical voltage waveform to drive discharge lamps when the duty cycle is close to 50%. They also eliminate the high current and high voltage resonant capacitor on the primary side, and reduce the voltage rating of a primary switch to twice the input voltage without the need for snubber circuits. The recommended inverters can be used to efficiently drive discharge lamps at low cost, particularly for applications with a narrow input voltage range. The lamp current can be regulated through the duty cycle modulation of the main switch.

US Patent:

7236041, Jun 26, 2007

Filed:

Aug 1, 2005

Appl. No.:

11/194952

Inventors:

Sangsun Kim - San Jose CA, US
Wei Chen - Campbell CA, US

Assignee:

Monolithic Power Systems, Inc. - San Jose CA

International Classification:

H03K 17/687

US Classification:

327434, 327110

Abstract:

Embodiments of isolated gate driver circuits are disclosed for driving high- and low-side switching devices for half- and full-bridge power converter topology. Disclosed circuits provide sufficient dead-time, operate over a wide range of duty cycles, and require a single power supply (V). Typical applications for such circuits include cold cathode fluorescent lamp (CCFL) inverters that are powered by a high voltage DC rail.

US Patent:

7265497, Sep 4, 2007

Filed:

Oct 13, 2005

Appl. No.:

11/250161

Inventors:

Wei Chen - Campbell CA, US
James C. Moyer - San Jose CA, US
Paul Ueunten - Los Gatos CA, US

Assignee:

Monolithic Power Systems, Inc. - San Jose CA

International Classification:

H05B 39/04

US Classification:

315209R

Abstract:

The present disclosure introduces a simple method and apparatus for converting DC power to AC power for driving discharge lamps such as a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp (EEFL), or a flat fluorescent lamp (FFL). Among other advantages, the invention allows the proper protection under short circuit conditions for applications where the normal lamp current is greater than safe current limit.

US Patent:

7291991, Nov 6, 2007

Filed:

Oct 13, 2005

Appl. No.:

11/249697

Inventors:

Wei Chen - Campbell CA, US

Assignee:

Monolithic Power Systems, Inc. - San Jose CA

International Classification:

H05B 37/02
H02M 1/12

US Classification:

315307, 363 41

Abstract:

Methods and apparatus are disclosed for converting DC power to AC and for driving multiple discharge lamps and, more particularly, Cold Cathode Fluorescent Lamps (CCFLs), External Electrode Fluorescent Lamps (EEFLs), and Flat Fluorescent Lamps (FFLs). Disclosed methods, among other advantages, allow accurate current sharing among the lamps, minimization of the total number of power switches, and, in general, simplification of the complexity of the control system.