Xigen G Zhou from 1001 Crystal Springs Dr, Allen, TX 75013, age 50

Adaptive Output Current Control For Switching Circuits
view source
US Patent:

7639517, Dec 29, 2009
Filed:

Feb 8, 2007
Appl. No.:

11/703718
Inventors:

Xigen Zhou - San Jose CA, US
David Roy Ng - San Jose CA, US
Steven M. Pietkiewicz - Fremont CA, US
Robert C. Dobkin - Monte Sereno CA, US
Assignee:

Linear Technology Corporation - Milpitas CA
International Classification:

H02M 3/335
US Classification:

363 2117, 363 2109, 363 97
Abstract:

System and methodology for controlling output current of switching circuitry having an input circuit and an output circuit electrically isolated from each other. A value of the output current may be determined based on input voltage, input current and reflected output voltage representing the voltage in the input circuit which corresponds to the output voltage. A switching element in the input circuit is controlled to produce the determined value of output current.

Programmable Conduction Mode Control For Switching Circuits
view source
US Patent:

7733672, Jun 8, 2010
Filed:

Nov 29, 2006
Appl. No.:

11/605297
Inventors:

Xigen Zhou - San Jose CA, US
Assignee:

Linear Technology Corporation - Milipitas CA
International Classification:

H02M 3/335
US Classification:

363 2109, 363 97, 323285
Abstract:

A control system that controls a switching circuit having a switching element and an inductive element coupled to an output of the switching element. The control system includes a switching control circuit that controls the switching element to operate the switching circuit in a first conduction mode of operation, such as a boundary conduction mode (BCM), in which current in the inductive element is maintained at a non-zero level during a first time period within each switching cycle. A conduction mode control circuit is configured for switching the switching circuit into a second conduction mode of operation, such as a discontinuous conduction mode (DCM), in which current in the inductive element is maintained at a non-zero level during a second time period within each switching cycle. The first time period differs from the second time period.

Solid-State Dc Circuit Breaker
view source
US Patent:

20030183838, Oct 2, 2003
Filed:

Mar 19, 2003
Appl. No.:

10/390712
Inventors:

Qin Huang - Blacksburg VA, US
Xigen Zhou - Blacksburg VA, US
Zhenxue Xu - Blacksburg VA, US
International Classification:

H01L029/74
US Classification:

257/107000
Abstract:

A high-speed, solid-state circuit breaker is capable of interrupting high DC currents without generating an arc, and it is maintenance-free. Both the switch and the tripping unit are solid-state, which meet precise protection requirements. The high-speed, solid-state DC circuit breaker uses an emitter turn-off (ETO) thyristor as the switch. The ETO thyristor has an anode, a cathode and first, second and third gate electrodes. The anode is connectable to a source of DC current, and the cathode is connectable to a load. A solid-state trip circuit is connected to the first, second and third gate electrodes for controlling interrpution of DC current to the load by turning off said ETO thyristor.

Xigen G Zhou