Yuhong Huang, 55Boston, MA

7170251, Jan 30, 2007

Jan 21, 2005

11/040332

Yuhong Huang - Acton MA, US

GSI Group Corporation - Billerica MA

G05B 11/42
G05B 1/03

318563, 318565, 318601, 318607, 318610

A diagnostic system is disclosed for analyzing a limited rotation motor system. The diagnostic system includes a first transform unit, a second transform unit, a closed loop frequency response unit, and a diagnostic system. The first transform unit is for receiving a first digital signal that is representative of a motor control signal, and is for providing a motor control frequency domain signal that is representative of a frequency domain representation of the motor control signal. The second transform unit is for receiving a second digital signal that is representative of a position detection signal, and is for providing a position detection frequency domain signal that is representative of a frequency domain representation of the position detection signal. The closed loop frequency response unit is for identifying a representation of the frequency response of the limited rotation motor responsive to the position detection frequency domain signal and the motor control frequency domain signals. The diagnostic unit is for comparing the representation of the frequency response with a previously recorded representation of a prior frequency response to identify an error condition with respect to the limited rotation motor system.

7190144, Mar 13, 2007

Jan 21, 2005

11/040230

Yuhong Huang - Acton MA, US

GSI Group Corporation - Billerica MA

G05B 11/42
G05B 19/29
G05B 11/01
G05B 21/02

318610, 318600, 318629, 318636, 3185682, 318727, 388815

An adjustment system is disclosed for adjusting a proportional, integral, derivative controller in a limited rotation motor system. The adjustment system includes a first transform unit, a second transform unit, a model identification unit, and a PID adjustment unit. The first transform unit is for receiving a first digital signal that is representative of a motor control signal, and is for providing a first frequency domain sequence that is representative of a frequency domain representation of the motor control signal. The second transform unit is for receiving a second digital signal that is representative of a position detection signal, and is for providing a second frequency domain sequence that is representative of a frequency domain representation of the position detection signal. The model identification unit is for identifying a representation of a ratio of the first and second frequency domain sequences. The PID adjustment unit is for identifying appropriate values for the coefficient kof a proportional unit of the system, for the coefficient kof an integral unit for the system, and for the coefficient kof a derivative unit for the system.

7291999, Nov 6, 2007

Nov 30, 2006

11/565012

Yuhong Huang - Acton MA, US

GSI Group Corporation - Billerica MA

G05B 11/42
G05B 1/03

318563, 318565, 318601, 318607, 318610

A method of analyzing a limited rotation motor system is disclosed. The method includes the step of providing a motor control frequency domain signal that is representative of a frequency domain representation of the motor control signal responsive to a first digital signal that is representative of a motor control signal. The method also includes the step of providing a position detection frequency domain signal that is representative of a frequency domain representation of the position detection signal responsive to a second digital signal that is representative of a position detection signal. The system further includes the steps of identifying a representation of the frequency response of the limited rotation motor responsive to the position detection frequency domain signal and the motor control frequency domain signals, and comparing the representation of the frequency response with a previously recorded representation of a prior frequency response to identify an error condition with respect to the limited rotation motor system.

2005016, Jul 28, 2005

Jan 21, 2005

11/040603

Yuhong Huang - Acton MA, US

G06G007/48

703006000

A virtual marking system is disclosed for simulating the performance of a limited rotation motor system. The virtual marking system includes a command generation unit, a limited rotation motor system unit, and an optical-mechanical modeling unit. The command generation unit is for receiving data representative of a pattern to be marked and for providing a set of commands for marking the pattern to be marked. The limited rotation motor system unit is for receiving the set of commands for marking the pattern to be marked and for providing optical element response signals that are representative of virtual positions of an optical element. The optical-mechanical modeling unit is for receiving the optical element response signals and for providing a virtual image of the pattern to be marked.

2005017, Aug 11, 2005

Jan 21, 2005

11/040372

Yuhong Huang - Acton MA, US

G01D018/00

702085000

An optimization system is disclosed for optimizing the performance of a laser processing system that employs a limited rotation motor. The optimization system includes an input unit for receiving input parameters including stroke speed, stroke delay, jump speed and jump delay, and includes an evaluation unit for identifying one of an optimal stroke speed or stroke quality for achieving a desired processing performance.

2007012, May 31, 2007

Dec 5, 2006

11/566829

Yuhong Huang - Acton MA, US

GSI GROUP CORPORATION - Billerica MA

H04J 11/00

370210000

A method is disclosed for adjusting a proportional, integral, derivative controller in a limited rotation motor system. The method includes the step of providing a first frequency domain sequence that is representative of a frequency domain representation of a motor control signal responsive to a first digital signal that is representative of the motor control signal. The method also includes the step of providing a second frequency domain sequence that is representative of a frequency domain representation of a position detection signal responsive to a second digital signal that is representative of the position detection signal. The method further includes the steps of identifying a representation of a ratio of the first and second frequency domain sequences, and identifying appropriate values for the coefficient kof a proportional unit of the system, for the coefficient kof an integral unit for the system, and for the coefficient kof a derivative unit for the system responsive to the ratio of the first and second frequency domain signals.

2013020, Aug 15, 2013

Feb 13, 2012

13/372327

Javier A. Salcedo - North Billerica MA, US
David J. Clarke - Patrickswell, IE
Gavin P. Cosgrave - Enniscorthy, IE
Yuhong Huang - Mountain View CA, US

Analog Devices, Inc. - Norwood MA

H02H 3/22

361111

Harsh electrical environments integrated circuit protection for system-level robustness and methods of forming the same are provided. In one embodiment, a protection system includes dual-polarity high blocking voltage primary and secondary protection devices each electrically connected to a pad. The primary protection device has a current handling capability greater than a current handling capability of the secondary protection devices, and the secondary protection device has a turn-on speed that is faster than a turn-on speed of the primary protection device so as to decrease pad voltage overshoot when a fast transient electrical event occurs on the pad. Additionally, the holding voltage of the primary protection device is less than a holding voltage of the secondary protection device such that once the primary protection device has been activated the primary protection device clamps the pad voltage so as to minimize a flow of high current through the secondary protection device.

2014004, Feb 13, 2014

Aug 8, 2012

13/570101

Gavin P. Cosgrave - Enniscorthy, IE
Javier Alejandro Salcedo - North Billerica MA, US
Yuhong Huang - Mountain View CA, US
David J. Clarke - Patrickswell, IE
Minsheng Li - Mountain View CA, US

Analog Devices, Inc. - Norwood MA

H02H 3/20
H02H 3/24

361 90

An amplifier includes a fault protection control circuit biased from the signal pin and a fault protection circuit including a first PMOS transistor and a second PMOS transistor. The sources and bodies of the first and second PMOS transistors can be connected to one another, the drain of the first PMOS transistor can be connected to the amplifier's output, and the drain of the second PMOS transistor can be connected to a signal pin. During normal operating conditions, the fault protection control circuit can turn on the first and second PMOS transistors. However, the fault protection control circuit can turn off the first PMOS transistor and turn on the second PMOS transistor when an overvoltage condition is detected, and can turn on the first PMOS transistor and turn off the second PMOS transistor when an undervoltage condition is detected, even when the integrated circuit is unpowered.