Raymond C Liu

US Patent:

7049813, May 23, 2006

Filed:

May 19, 2004

Appl. No.:

10/848654

Inventors:

Raymond Y. Liu - Monterey Park CA, US
Estella C. Chung - West Hills CA, US

Assignee:

HR Textron Inc. - Santa Clarita CA

International Classification:

G01R 33/07
B01B 7/30

US Classification:

324251, 32420725

Abstract:

Systems, methods, and computer-readable media are disclosed for error-compensated counting of Hall states for motor position feedback and/or commutation. An indicated Hall state is detected by digital Hall state sensors and a duration of the Hall state is compared to a specified time period. When the duration exceeds the specified time period, the indicated Hall state is compared to one or more valid Hall states and a position counter is changed for valid states. When the indicated Hall state is invalid, the position counter is not changed. The Hall state sensors may be connected to logic means and may detect the position of a rotor of a permanent magnet motor relative to a stator. When noise induces a change in an indicated Hall state, corresponding noise-induced effects on the position counter may be may be removed through error-compensated counting.

US Patent:

7230422, Jun 12, 2007

Filed:

Apr 28, 2006

Appl. No.:

11/413276

Inventors:

Raymond Y. Liu - Monterey Park CA, US
Estella C. Chung - West Hills CA, US

Assignee:

HR Textron, Inc. - Santa Clarita CA

International Classification:

G01R 33/07
G01B 7/30

US Classification:

324251, 3242072, 32420725

Abstract:

Systems, methods, and computer-readable media are disclosed for error-compensated counting of Hall states for motor position feedback and/or commutation. An indicated Hall state is detected by digital Hall state sensors and a duration of the Hall state is compared to a specified time period. When the duration exceeds the specified time period, the indicated Hall state is compared to one or more valid Hall states and a position counter is changed for valid states. When the indicated Hall state is invalid, the position counter is not changed. The Hall state sensors may be connected to logic means and may detect the position of a rotor of a permanent magnet motor relative to a stator. When noise induces a change in an indicated Hall state, corresponding noise-induced effects on the position counter may be may be removed through error-compensated counting.

US Patent:

7808200, Oct 5, 2010

Filed:

Sep 6, 2007

Appl. No.:

11/850999

Inventors:

Raymond Y. Liu - Monterey Park CA, US
Estella C. Chung - West Hills CA, US

Assignee:

Woodward HRT, Inc. - Santa Clara CA

International Classification:

H02P 3/18

US Classification:

318700, 31840021, 31840038, 318434, 318437

Abstract:

A technique can recover from motor stalls caused by misalignment of motor position sensors such as Hall-effect sensors. In a normal operating mode, a motor controller provides motor drive current to the motor windings based on the sensor signals according to a normal commutation sequence, and monitors for occurrence of a motor stall condition. Upon detecting the motor stall condition, the motor controller first momentarily drives the windings according to one of an advanced commutation state and a delayed commutation state each adjacent to the given commutation state in the normal commutation sequence, and determines whether the motor stall condition persists. If the stall condition persists, then the motor controller next momentarily drives the windings according to the other of the advanced commutation state and the delayed commutation state. By this action, the controller attempts operation at both preceding and succeeding portions of the torque characteristic, such that operation with increased torque is ensured even though the direction of the sensor misalignment is unknown.

US Patent:

7956619, Jun 7, 2011

Filed:

May 31, 2007

Appl. No.:

11/809332

Inventors:

Raymond Y. Liu - Monterey Park CA, US
Estella C. Chung - West Hills CA, US
Joon Lee - Santa Clarita CA, US

Assignee:

Woodward HRT, Inc. - Santa Clarita CA

International Classification:

G01R 31/06
G01R 31/08

US Classification:

324546, 324522

Abstract:

A device has built-in inductive load testing capabilities. The device includes a device housing, an inductive load disposed within the device housing; and test circuitry disposed within the device housing. The test circuitry is constructed and arranged to effectuate application of a modulated test signal to the inductive load, and obtain a result signal in response to the application of the modulated test signal to the inductive load. The test circuitry is further constructed and arranged to generate an output signal indicating that the inductive load is in one of (i) a shorted inductive load state, (ii) a normal inductive load state, and (iii) an abnormally high inductive load state, based on the result signal. Such test circuitry is well-suited for testing a variety of devices having inductors/coils which are susceptible to defects (e. g. , a solenoid, a motor winding, various actuator components, etc. ).

US Patent:

7973503, Jul 5, 2011

Filed:

Jun 26, 2007

Appl. No.:

11/768475

Inventors:

Raymond Y. Liu - Monterey Park CA, US
Estella C. Chung - West Hills CA, US

Assignee:

Wooward HRT, Inc. - Santa Clarita CA

International Classification:

H02K 29/08

US Classification:

31840038, 31840037, 318604, 3242072

Abstract:

A system has a sensor assembly mounted adjacent to a moving magnetic member such as a motor rotor to sense its position. The sensor assembly includes Hall-effect sensors each having a binary output, configured such that distinct positions of the moving magnetic member correspond to distinct digital patterns of the outputs of the Hall-effect sensors. Encoding circuitry is coupled to the outputs of the Hall-effect sensors to generate a multi-valued analog output, distinct values of the multi-valued analog output representing corresponding distinct digital patterns of the outputs of the Hall-effect sensors. The encoding circuitry may employ a ladder network with weighted-value resistors contributing different components of an analog current sensed by the controller. The sensed current can be converted to digital position information using suitable analog-to-digital conversion circuitry. The multi-valued analog output can be conveyed on a single wire in contrast to the prior art which requires one wire per Hall-effect sensor.

US Patent:

59915463, Nov 23, 1999

Filed:

Aug 29, 1997

Appl. No.:

8/906775

Inventors:

Teh-Hsin Philip Chan - Irvine CA
Mike Ching-Hsing Chen - Irvine CA
Arthur Kent Hargrove - Irvine CA
Scot Chuen Leung Hui - West Covina CA
Jason Jzhong Lee - La Habra CA
Brian Chien Hun Lin - Laguna Niguel CA
Sam Chien-Shin Lin - Rancho Santa Margarita CA
Raymond Cheng-Yu Liu - Laguna Niguel CA
Victor Moon-Fai Siu - Huntington Beach CA
Sam An Wong - Orange CA

Assignee:

CMD Technology, Inc. - Irvine CA

International Classification:

G06F 1300

US Classification:

395882

Abstract:

A system and method for interfacing peripheral devices to a computer universal serial bus is disclosed. The system is adaptable to a wide variety of peripheral devices and features a user-configurable serial EEPROM coupled to the interface in which vendor specific data can be stored for use by the interface. Interface parameters may also be selected by an externally controllable configuration switch.

US Patent:

20220372101, Nov 24, 2022

Filed:

Sep 23, 2020

Appl. No.:

17/763110

Inventors:

- Oakland CA, US
Raymond LIU - Oakland CA, US
Iowis ZHU - Oakland CA, US

International Classification:

C07K 14/705
C07K 14/47
C07K 16/28
A61P 35/02
A61K 35/17
A61K 45/06
A61K 39/395
A61K 38/17
C07K 14/575
A61K 38/22
A61P 35/00

Abstract:

The present disclosure generally relates to, among other things, a new class of receptors engineered to modulate transcription in a ligand-dependent manner. The new receptors provide a selectable degree of noise, expression level, and signal to noise ratio. The disclosure also provides compositions and methods useful for producing such receptors, nucleic acids encoding same, host cells genetically modified with the nucleic acids, as well as methods for modulating an activity of a cell and/or for the treatment of various health conditions or diseases, such as cancers.

US Patent:

20220356225, Nov 10, 2022

Filed:

Sep 23, 2020

Appl. No.:

17/763122

Inventors:

- Oakland CA, US
- Boston MA, US
Raymond LIU - San Francisco CA, US
Ahmad S. KHALIL - Boston MA, US
Divya ISRANI - Boston MA, US

International Classification:

C07K 14/705
C07K 16/28
C07K 14/725
A61K 35/17
C12N 5/0783

Abstract:

The present disclosure generally relates to, inter alia, a new class of chimeric Notch receptors containing a synthetic zinc finger transcriptional effector (synZTE) module, engineered to modulate gene expression and cellular activities in a ligand-dependent manner. The new Notch receptors surprisingly retain the ability to transduce signals in response to ligand binding despite that the Notch extracellular subunit, which includes the negative regulatory region previously believed to be essential for the functioning of Notch receptors, is partly or completely deleted. In addition, the synZTE is designed to bind orthogonal DNA target sequences in target organisms which in turn facilitates precise regulation of therapeutic gene expression with minimal off-target activity. Also provided are compositions and methods useful for producing such receptors, nucleic acids encoding same, host cells genetically modified with the nucleic acids, as well as methods for modulating an activity of a cell and/or for treatment of various health conditions.