Yong Chun Li

US Patent:

7250742, Jul 31, 2007

Filed:

Nov 4, 2005

Appl. No.:

11/267516

Inventors:

Yong Li - Torrance CA, US

Assignee:

International Rectifier Corporation - El Segundo CA

International Classification:

G05F 1/70

US Classification:

323207, 363127

Abstract:

A circuit for providing power factor correction includes a bridgeless boost converter circuit and a control circuit receiving an input AC line voltage of the bridgeless boost converter circuit, wherein the control circuit provides a pulse width modulated signal to control the on time of a PFC switch of the bridgeless boost converter circuit. The control circuit also includes a scaling device operable to scale down a bi-polar AC voltage of the input AC line voltage to a uni-polar AC voltage, an analog to digital converter operable to convert the uni-polar AC voltage into digital data and a digital rectifier operable to process the digital data of the uni-polar AC voltage to provide a half-sinusoidal AC signal that is proportional to and in phase with the input AC line voltage for use in providing the pulse width modulated signal.

US Patent:

7274241, Sep 25, 2007

Filed:

Apr 5, 2006

Appl. No.:

11/398449

Inventors:

Eddy Ying Yin Ho - Torrance CA, US
Yong Li - Torrance CA, US
Jun Honda - El Segundo CA, US
David C Tam - Manhattan Beach CA, US
Toshio Takahashi - Rancho Palos Verdes CA, US

Assignee:

International Rectifier Corporation - El Segundo CA

International Classification:

H03K 17/16

US Classification:

327381, 327387, 327434, 327170

Abstract:

A gate driver for a power switch, comprising a gate drive circuit coupled to the gate of the power switch for at least one of turning on and turning off the power switch; a gate voltage control circuit in the gate drive circuit for controlling a voltage applied to the gate of the power switch during at least one of turning on and turning off the power switch; and a signal supplied to the gate voltage control circuit indicative of a voltage rate of change per unit time to be applied in at least one of turning on and turning off the power switch.

US Patent:

7359224, Apr 15, 2008

Filed:

Apr 26, 2006

Appl. No.:

11/411718

Inventors:

Yong Li - Torrance CA, US

Assignee:

International Rectifier Corporation - El Segundo CA

International Classification:

G05F 1/70

US Classification:

363 89

Abstract:

A circuit for providing power factor correction in accordance with an embodiment of the present application may include a boost converter circuit and a control circuit receiving as inputs a rectified AC input voltage from a rectifier, a signal proportional to current through the boost inductor and the DC bus voltage across the capacitor of the boost converter. The control circuit provides a pulse width modulated signal to control the on time of a PFC switch. The control circuit further includes a voltage regulator and a current regulator. The current regulator includes a difference device operable to subtract a signal proportional to the inductor current from the current reference signal, a PI controller adapted to receive the output of the difference device and provide a first control signal, a feed forward device operable to receive the rectified AC input voltage and to provide a second control signal with a smaller dynamic range than the AC input voltage, and an adder operable to add the first control signal to the second control signal to provide a PWM reference signal for generating the pulse width modulated signal. A zero crossing detector and vector rotator may be provided to provide a clean sinusoidal reference to the current regulator. A partial PFC regulator may be provide to provide partial mode PFC if desired.

US Patent:

7405528, Jul 29, 2008

Filed:

Jan 23, 2006

Appl. No.:

11/337282

Inventors:

Eddy Ying Yin Ho - Torrance CA, US
Yong Li - Torrance CA, US
Jun Honda - El Segundo CA, US
David Tam - Manhattan Beach CA, US
Toshio Takahashi - Rancho Palos Verdes CA, US

Assignee:

International Rectifier Corporation - El Segundo CA

International Classification:

G05B 5/01

US Classification:

31840025, 318448, 318456, 327381

Abstract:

A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides a noise level indication to a system controller. Power switches in both a power converter and power inverter are cooperatively controlled with dynamic dv/dt control to reduce switching noise according to a profile specified by the controller. The dv/dt control is provided as an analog signal to a high voltage IC and codified as a pulse width for a level shifting circuit supplying control signals to the high voltage gate drive. A noise extraction circuit and technique obtain fast noise sampling to permit noise cancellation and adaptive noise reduction.

US Patent:

20090206902, Aug 20, 2009

Filed:

Aug 25, 2008

Appl. No.:

12/197856

Inventors:

YONG LI - Torrance CA, US

International Classification:

H03K 7/08

US Classification:

327176

Abstract:

A method for providing power factor correction for a boost converter in accordance with an embodiment of the present application includes providing a current sense signal indicative of a current flowing through an inductor of the boost converter, sampling the current sense signal to provide a digital current sense signal, generating a pulse width modulated output signal to control an on time of a PFC switch of the boost converter based on the digital current sense signal, generating a first synchronous signal based on a carrier frequency of a triangular carrier wave used to generate the pulse width modulated output signal, wherein the first synchronous signal triggers generation of the pulse width modulated output signal and generating a second synchronous signal based on the first synchronous signal, wherein the second synchronous signal indicates a sampling rate to be used in sampling the current sense signal to provide the digital current sense signal, such that sampling takes place substantially in a middle of a cycle of the pulse width modulated output signal.

US Patent:

20140359153, Dec 4, 2014

Filed:

Jun 28, 2013

Appl. No.:

13/931155

Inventors:

- Irvine CA, US
Wade Keith Wan - Orange CA, US
Yong Li - San Diego CA, US
Xuemin Chen - Rancho Santa Fe CA, US

International Classification:

H04L 29/06

US Classification:

709231

Abstract:

Systems and methods for transmitting content are provided. In some aspects, a method includes receiving an indication of a plurality of input streams of content. Each input stream is associated with an input bit rate. The method includes determining a plurality of output bit rates at which to transmit the content to one or more client devices, comparing the plurality of input bit rates to the plurality of output bit rates, and generating, by a server, a plurality of output streams of the content based on the comparison. Each generated output stream is associated with a corresponding output bit rate and includes a transcoded input stream or a non-transcoded input stream. The plurality of output streams is generated such that a number of output streams comprising non-transcoded input streams is maximized. The method also includes transmitting the generated output streams to the one or more client devices.

Address:

2311 Elden Ave APT 1, Costa Mesa, CA 92627

VIN:

19UUA66287A005222

Make:

ACURA

Model:

TL

Year:

2007