Dong J Wang

US Patent:

20120063175, Mar 15, 2012

Filed:

Sep 8, 2011

Appl. No.:

13/228268

Inventors:

Dong WANG - El Segundo CA, US
Yan-Fei LIU - Kingston, CA

International Classification:

H02M 3/335

US Classification:

363 2114

Abstract:

Provided are circuits and methods for driving the synchronous rectifier (SR) of a power converter. A non-linear voltage sense compensator is applied across the drain and source of the SR, and a sense signal is provided to the SR driver sense input, such that false triggering of the SR is effectively eliminated. In addition, the voltage sense compensator ensures that the SR is turned on as soon as its current starts to flow and is turned off when its current falls to zero. The embodiments described herein may be incorporated into new VR designs, or they may be used to improve the SR driving characteristics of commercially available voltage sensing SR drivers.

US Patent:

20140021487, Jan 23, 2014

Filed:

Jul 3, 2013

Appl. No.:

13/934579

Inventors:

Hongying Helen Ding - Hermosa Beach CA, US
Dong Wang - El Segundo CA, US

International Classification:

H01L 27/088

US Classification:

257 77, 257194

Abstract:

In one implementation, a modular power converter having a reduced switching loss includes a package, a field-effect transistor (FET) including a gate terminal, a drain terminal, and a source terminal, and fabricated on a semiconductor die situated inside the package, and a driver circuit inside the package. The driver circuit is configured to drive the gate terminal of the FET. The driver circuit is further configured to sample a drain-to-source voltage (V) of the FET directly from the drain terminal and the source terminal, thereby enabling the reduced switching loss.