VICTOR LEE, DC, L.AC.
Acupuncture in Rancho Cucamonga, CA

8049439, Nov 1, 2011

Jan 30, 2009

12/363607

Bin Zhao - Irvine CA, US
Jack W. Cornish - Foothill Ranch CA, US
Brian B. Horng - Irvine CA, US
Victor K. Lee - Irvine CA, US
Andrew M. Kameya - Irvine CA, US

Freescale Semiconductor, Inc. - Austin TX

H05B 37/02

315297, 315307, 315308

A voltage source provides an output voltage to drive a plurality of light emitting diode (LED) strings. A LED driver adjusts the level of the output voltage so as to maintain the lowest tail voltage of the LED strings at or near a predetermined threshold voltage so as provide sufficient headroom voltages for current regulators for the LED strings. The LED driver operates in an operational mode and a calibration mode, which can be implemented in parallel with, or part of, the operational mode. During the calibration mode, the LED driver determines, for each LED string, a code value representative of the level of the output voltage necessary to maintain the tail voltage of the corresponding LED string at or near the predetermined threshold voltage. In the operational mode, the code values from the calibration mode are used to control the voltage source to provide an appropriate level for the output voltage.

8279144, Oct 2, 2012

Jul 31, 2008

12/183492

Bin Zhao - Irvine CA, US
Jack W. Cornish - Foothill Ranch CA, US
Brian B. Horng - Irvine CA, US
Andrew M Kameya - Irvine CA, US
Jan Krellner - Chandler AZ, US
Kenneth C. Kwok - Irvine CA, US
Victor K. Lee - Irvine CA, US
Weizhuang W. Xin - Aliso Viejo CA, US

Freescale Semiconductor, Inc. - Austin TX

G09G 3/32

345 82, 315297

Disclosed are example techniques for frame-based power management in a light emitting diode (LED) system having a plurality of LED strings. A voltage source provides an output voltage to drive the LED strings. An LED driver generates a frame timing reference representative of the frame rate or display timing of a series of image frames to be displayed via the LED system. An update reference is generated from the frame timing reference. The LED driver monitors one or more operating parameters of the LED system. In response to update triggers marked by the update reference, the LED driver adjusts the output voltage of the voltage source based on the status of each of the one or more monitored operating parameters (either from the previous update period or determined in response to the update trigger), thereby synchronizing the updating of the output voltage to the frame rate (or a virtual approximation of the frame rate) of the video being displayed.

8115414, Feb 14, 2012

Jan 30, 2009

12/363179

Bin Zhao - Irvine CA, US
Jack W. Cornish - Foothill Ranch CA, US
Brian B. Horng - Irvine CA, US
Victor K. Lee - Irvine CA, US
Andrew M. Kameya - Irvine CA, US

Freescale Semiconductor, Inc. - Austin TX

H05B 37/02

315299, 315185 S, 315308, 315312, 315360

Techniques for dynamic headroom control in a light emitting diode (LED) system are disclosed. An output voltage is provided to drive a plurality of LED strings. A feedback controller monitors the tail voltages of the LED strings to identify the minimum tail voltage and adjusts the output voltage based on the lowest tail voltage. The LED strings grouped into subsets and the feedback controller is segmented such that, for a certain duration, a minimum tail voltage is determined for each subset. The minimum tail voltages of the subsets are used to determine the overall minimum tail voltage of the plurality of LED strings for the certain duration so as to control the output voltage in the following duration. The segments of the feedback controller can be implemented in separate integrated circuit (IC) packages, thereby facilitating adaptation to different numbers of LED strings by integrating the corresponding number of IC packages.

8228098, Jul 24, 2012

Aug 7, 2009

12/537443

Bin Zhao - Irvine CA, US
Andrew M. Kameya - Irvine CA, US
Victor K. Lee - Irvine CA, US

Freescale Semiconductor, Inc. - Austin TX

H03B 19/00, H03K 7/08

327114, 327172, 327175

A pulse width modulation (PWM) frequency converter converts an input PWM signal to an output PWM signal having a different frequency while maintaining a substantially equal duty ratio. The PWM frequency converter samples the input PWM signal for a PWM cycle using a sampling clock. A filter module filters the resulting set of one or more PWM parameters to compensate for noise introduced by potential clock mismatch, clock jitter, ambient variations, and other non-deterministic issues, thereby generating filtered PWM parameters. The sampling employed by the filter module compares a difference between the one or more current PWM parameters and previous (or historical) PWM parameters from an earlier sampled PWM cycle to a predetermined change threshold in determining a filtered set of one or more PWM parameters. The filtered set of one or more PWM parameters then is used to generate one or more corresponding PWM cycles of the output signal.

8373643, Feb 12, 2013

Oct 3, 2008

12/244796

Bin Zhao - Irvine CA, US
Andrew M. Kameya - Irvine CA, US
Victor K. Lee - Irvine CA, US

Freescale Semiconductor, Inc. - Austin TX

G09G 3/36

345102

A PWM generation module generates a PWM data signal used to control a light emitting diode (LED) driver for one or more strings of LEDs of a display device. The PWM data signal is synchronized with the frame boundaries of the video content being displayed. The PWM generation module can configure the PWM data signal such that a new PWM cycle is initiated at the start of each successive frame, and further whereby those PWM cycles that would be prematurely terminated at frame boundaries are instead driven at a constant reference level until the frame boundary. With this configuration, a substantially linear average light intensity can be achieved across frames, thereby reducing or eliminating display distortion that is often present in other PWM cycle synchronization techniques. The PWM generation module can use a self-learning process to make adjustments to the expected number of completeable PWM cycles per frame in response to dynamic changes in the frame rate, PWM frequency, or other related display parameters.

8633680, Jan 21, 2014

Aug 24, 2011

13/216522

Bin Zhao - Irvine CA, US
Jack Cornish - Foothill Ranch CA, US
Victor Lee - Irvine CA, US

Fairchild Semiconductor Corporation - San Jose CA

G05F 1/44, G05F 1/56

323266, 323282, 323284, 323285, 323270, 323271

In one general aspect, an apparatus can include a controller, and a power stage coupled to the controller and configured to be coupled to a power source. The power stage is configured to deliver an output voltage to a load module in response to the controller. The apparatus also includes a reference voltage circuit coupled to the controller and configured to be grounded to a first ground voltage different from a second ground voltage associated with the load module.

2013024, Sep 26, 2013

Sep 17, 2012

13/621380

Victor Lee - Irvine CA, US

Fairchild Semiconductor Corporation - San Jose CA

G05F 1/46

323284

Generally, this disclosure provides methods and systems for improved startup for DC-DC converters that reduce input voltage droop, in-rush current and output voltage jumps. The system may include a power stage circuitry including a plurality of power segments coupled in parallel, the power stage circuitry is coupled between an input voltage and output stage circuitry and configured to deliver power to a load coupled to the output stage circuitry. The system may further include PWM and power stage controller circuitry configured to sequentially and progressively activate the plurality of power segments to limit an input in-rush current from the input voltage during a ramp up period and output voltage at the output stage circuitry.

2012024, Oct 4, 2012

Aug 24, 2011

13/216565

Bin Zhao - Irvine CA, US
Jack Cornish - Foothill Ranch CA, US
Victor Lee - Irvine CA, US
Brian Horng - Irvine CA, US

G05F 1/10

323234

In one general aspect, a power supply circuit can include a power stage configured to be coupled to a power source and configured to deliver an output voltage to a load circuit, and can include a comparator coupled to the power stage and configured to receive a reference voltage. The power supply circuit can also include a hysteresis control circuit configured to receive at least one of a feedback voltage or a reference voltage and configured to change a hysteresis of the comparator in response to the at least one of the feedback voltage or the reference voltage during a soft-start of the power supply circuit.