Wei I Chen

6462525, Oct 8, 2002

Nov 29, 2001

09/995701

Wei Chen - Campbell CA

Linear Technology Corp. - Milpitas CA

G05F 140

323285, 323282

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.

6593724, Jul 15, 2003

Aug 1, 2001

09/920463

Wei Chen - Campbell CA

Linear Technology Corporation - Milpitas CA

G05F 140

323283, 323272

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.

6803752, Oct 12, 2004

Feb 14, 2000

09/503549

Wei Chen - Campbell CA

Linear Technology Corporation - Milpitas CA

G05F 140

323282, 323272

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.

7161305, Jan 9, 2007

May 19, 2004

10/850351

Wei Chen - Campbell CA, US

Monolithic Power Systems, Inc. - Los Gatos CA

H05B 37/02

315209R, 315219, 315307

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.

7236041, Jun 26, 2007

Aug 1, 2005

11/194952

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

Monolithic Power Systems, Inc. - San Jose CA

H03K 17/687

327434, 327110

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.

7265497, Sep 4, 2007

Oct 13, 2005

11/250161

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

Monolithic Power Systems, Inc. - San Jose CA

H05B 39/04

315209R

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.

7291991, Nov 6, 2007

Oct 13, 2005

11/249697

Wei Chen - Campbell CA, US

Monolithic Power Systems, Inc. - San Jose CA

H05B 37/02
H02M 1/12

315307, 363 41

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.

7304441, Dec 4, 2007

Aug 5, 2005

11/198029

Wei Chen - Campbell CA, US
Simon Tsai - Taipei County, TW

Monolithic Power Systems, Inc. - San Jose CA

H05B 37/02

315300

A technique is described that facilitates sensing current through a load. A method according to the technique includes mounting a discharge lamp in a floating point configuration, sensing current through the discharge lamp, and controlling current through the discharge lamp to improve power conversion efficiency. A device constructed according to the technique may include two AC voltage sources that are out-of-phase with respect to one another. A current sense circuit may be coupled between the AC voltage sources. When a load is connected to nodes of the AC voltage sources, the current sense circuit may sense current between the nodes that is associated with, or perhaps approximates, current through the load.