Gang Liu

US Patent:

6486643, Nov 26, 2002

Filed:

Aug 27, 2001

Appl. No.:

09/813078

Inventors:

Gang Liu - Novi MI

Assignee:

Analog Technologies, Inc. - Farmington Hills MI

International Classification:

G05F 159

US Classification:

323268, 323274, 323284

Abstract:

An H bridge regulating system for driving an electric load includes a linear output stage and switch mode output stage connected to opposite ends of the load. The linear output stage has a linear mode amplifier and a feedback circuit, and its amplifier generates a first output signal tied to one end of the load. This output voltage is passed through a conditioning resistor to an inverting input of the linear mode amplifier. The switch mode output stage has a switch mode amplifier and a feedback circuit, and its amplifier generates a second output signal tied to the other end of the load. Its voltage signal is passed through a second conditioning resistor to an inverting input of the switch mode amplifier. Other feedback circuit elements are also provided to create three distinct regions of operations for each of the amplifiers. Due to this novel arrangement for an H bridge circuit, and this novel method of operation involving three distinct regions of operation for the linear mode and switch mode output stages, very high power-saving energy efficiencies are achieved.

US Patent:

6636124, Oct 21, 2003

Filed:

Nov 30, 2001

Appl. No.:

10/000775

Inventors:

Gang Liu - Novi MI

Assignee:

Analog Technologies, Inc. - Sunnyvale CA

International Classification:

H03K 708

US Classification:

332109, 327172

Abstract:

A pulse width modulation (PWM) circuit has a PWM output signal that features accurate timing even in the face of interference imposed upon the control signal representative of the desired PWM duty cycle. The PWM circuit includes or has a first or switching section and a second or analog section. The second section has an operational amplifier with a summing circuit that sums two input signals, namely a triangular wave signal and the control input signal, and then amplifies the summed signal to produce a trapezoidal waveform output delivered to the second section. The first section features a two-input comparator that produces a PWM signal output with a fast transition in response to trapezoidal output fed as an input and compared to a stable reference signal. Due to the speed of the op amp, timing errors on the PWM output signal due to interference on the control signal are minimized.

US Patent:

6801557, Oct 5, 2004

Filed:

Apr 6, 2001

Appl. No.:

09/827764

Inventors:

Gang Liu - Novi MI 48375

International Classification:

H01S 300

US Classification:

372 3809, 372 3802, 372 3803, 372 3804, 372 3807

Abstract:

A laser driver for laser sensing system having two lasers on a single PCB, thermo-electric temperature control, rapid activation, and pulse power and duration safety tables embedded in the microprocessor controller.

US Patent:

20040008949, Jan 15, 2004

Filed:

Jun 21, 2002

Appl. No.:

10/176501

Inventors:

Gang Liu - Novi MI, US
Robert Rubock - Jefferson MD, US

International Classification:

G02B006/36

US Classification:

385/077000

Abstract:

A fiber optic connector comprises a body and a cable guide. The body comprises a first end for interfacing with a fiber optic transceiver and a second end for receiving a fiber optic cable. The body includes a passage from the first end of the body to the second end of the body for receiving the cable. The cable guide comprises a first end having a first inner perimeter and a second end having a second inner perimeter. The cable guide includes a passage from the first end of the cable guide to the second end of the cable guide for receiving the fiber optic cable. The first end of the cable guide is coupled to the second end of the body. The length of the first inner perimeter is less than the length of the second inner perimeter, thereby limiting bending of a portion of the fiber optic cable within and proximate the cable guide and allowing radial movement of the fiber optic cable within the cable guide.

US Patent:

20130336777, Dec 19, 2013

Filed:

Jun 19, 2012

Appl. No.:

13/526863

Inventors:

Matthew John McKeever - Greer SC, US
Gang Liu - Simpsonville SC, US
Umesh Garg - Bangalore, IN
Ryan Wesley Murphy - Charlotte NC, US
Edward Charles Schurr - Simpsonville SC, US
Michael James Dutka - Simpsonville SC, US
Govindarajan Rengarajan - Simpsonville SC, US
Paul Griffin Delvernois - Greer SC, US
Ya-Tien Chiu - Greer SC, US
Roger Claude Beharrysingh - Simpsonville SC, US
Marc Edward Blohm - Greenville SC, US
SenthilKumar Narendran - Chennai, IN

International Classification:

F03B 11/02

US Classification:

4152081, 416223 R

Abstract:

An article of manufacture having a nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in a scalable table, the scalable table selected from the group of tables consisting of TABLES 1-11, wherein the Cartesian coordinate values of X, Y and Z are non-dimensional values convertible to dimensional distances by multiplying the Cartesian coordinate values of X, Y and Z by a number, and wherein X and Y are coordinates which, when connected by continuing arcs, define airfoil profile sections at each Z height, the airfoil profile sections at each Z height being joined with one another to form a complete airfoil shape.

US Patent:

20130336780, Dec 19, 2013

Filed:

Jun 19, 2012

Appl. No.:

13/526941

Inventors:

Matthew John McKeever - Greer SC, US
Gang Liu - Simpsonville SC, US

International Classification:

F03B 11/02

US Classification:

4152081, 416223 R

Abstract:

An article of manufacture having a nominal airfoil profile substantially in accordance with Cartesian coordinate values of X, Y and Z set forth in scalable Table 1 wherein the Cartesian coordinate values of X, Y and Z are non-dimensional values convertible to dimensional distances by multiplying the Cartesian coordinate values of X, Y and Z by a number, and wherein X and Y are coordinates which, when connected by continuing arcs, define airfoil profile sections at each Z height, the airfoil profile sections at each Z height being joined smoothly with one another to form a complete airfoil shape.

US Patent:

20130343902, Dec 26, 2013

Filed:

Jun 22, 2012

Appl. No.:

13/530355

Inventors:

Raymond Joseph Lecuyer - Taylors SC, US
John Herbert Dimmick - Greenville SC, US
Ashok Kumar Haveri Murigeppa - Bangalore, IN
Gang Liu - Simpsonville SC, US

Assignee:

GENERAL ELECTRIC COMPANY - Schenectady NY

International Classification:

F01D 25/28

US Classification:

416244 A

Abstract:

A bolted flange assembly for securing rotating components in a gas turbine. The bolted flange assembly includes two rotating wheels, each wheel having at least one arm extending towards a spacer positioned partially between the two rotating wheels, wherein each arm has a flange surface facing the spacer. Either each flange surface or a surface of the spacer is conical, i.e., non-perpendicular to a centerline of the gas turbine, such that in an unconstrained state, a heel end of each flange surface is closer to the spacer than a toe end of each flange surface; and a bolt extending through the arm of each rotating wheel and the spacer.

US Patent:

49655795, Oct 23, 1990

Filed:

Nov 28, 1988

Appl. No.:

7/276700

Inventors:

Gang Liu - Detroit MI
Hanchi Huang - Sterling Heights MI
Pepe Siy - Dearborn Heights MI
Michael P. Polis - Grosse Pointe Park MI

Assignee:

The Board of Governors of Wayne State University - Detroit MI

International Classification:

H03M 136

US Classification:

341159

Abstract:

A parallel analog-to-digital ("A/D") converter utilizing only N comparators and at least N-1 summing networks made of the simple resistance elements. The A/D conversion process operates asynchronously without need for registers, a clock circuit or latches and determines at a high rate of speed the N output bits for a given analog input signal. Each of the summing networks produces a composite analog signal which is fed into a respective one of the comparators. The digital output bit produced by each comparator is fed into the summing networks associated with those comparators whose output bits are less significant. Accordingly, when all output bits are changing on account of a new analog input value, the converter determines the most significant bit first, the next most significant bit next, and so on, until the least significant bit is determined. Because only simple resistive elements need be used in the summing circuit, the performance of the converter is determined principally by the switching speed of the comparators. The summing networks receive voltage inputs and produce an analog voltage output in accordance with weights which vary from one another by a predetermined power of two, as is established by the relative conductance of the resistance elements.