Yong X Li

US Patent:

7088081, Aug 8, 2006

Filed:

Jun 24, 2005

Appl. No.:

11/165939

Inventors:

Toshi Takahashi - Rancho Palos Verdes CA, US
Yong Li - Torrance CA, US

Assignee:

International Rectifier Corporation - El Segundo CA

International Classification:

G05F 1/56

US Classification:

323222, 323284, 323285, 323301

Abstract:

A circuit for providing power factor correction comprising a boost converter circuit having a boost inductance and a power factor correction switch coupled in series with the boost inductance, the boost inductance and power factor correction switch being coupled across the output of a rectifier being supplied with AC power from an AC line, the boost converter circuit further comprising a boost diode coupled to a junction between the inductor and the switch, an output of the boost diode coupled to an output capacitor, a DC bus voltage being provided across the output capacitor, further comprising a control circuit receiving as inputs a rectified AC input voltage from the rectifier, a signal proportional to current through the inductor and the DC bus voltage across the capacitor, and wherein the control circuit provides a pulse width modulated signal to control the on time of the PFC switch, further comprising an enable/disable circuit receiving as inputs the rectified AC input voltage and the DC bus voltage, the circuit instantaneously comparing the rectified AC input voltage and the DC bus voltage and controlling the control circuit whereby the control circuit provides the pulse width modulated signal to control the PFC switch when the rectified AC input voltage is less than the DC bus voltage and disables the generation of the pulse width modulated signal to the PFC switch when the rectified AC input voltage is greater than DC bus voltage.

US Patent:

7148664, Dec 12, 2006

Filed:

Nov 7, 2005

Appl. No.:

11/269377

Inventors:

Toshio Takahashi - Rancho Palos Verdes CA, US
Yong Li - Torrance CA, US

Assignee:

International Rectifier Corporation - El Segundo CA

International Classification:

G05F 1/56

US Classification:

323222, 323285, 323301

Abstract:

A circuit for providing power factor correction includes a boost converter circuit with a boost inductance and a power factor correction switch and a control circuit. The control circuit provides a pulse width modulated signal to control the on time of a PFC switch, and also includes a power factor correction pulse width modulated device receiving as inputs a rectified AC input voltage, a DC bus voltage, a signal proportional to the current through the inductor and a reference current signal. The power factor correction pulse width modulated device also includes a pulse width modulated generator operable to provide the pulse width modulated signal to control the on time of the PFC circuit and a pulse width modulated blanking device operable to provide an enable/disable signal to disable the pulse width modulated generator when predetermined conditions are met.

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:

7274758, Sep 25, 2007

Filed:

Feb 2, 2004

Appl. No.:

10/768073

Inventors:

Xu Zhou - Sunnyvale CA, US
Yong Li - Sunnyvale CA, US

Assignee:

Advanced Micro Devices, Inc. - Sunnyvale CA

International Classification:

H03D 1/00

US Classification:

375343, 375344

Abstract:

An OFDM receiver has an autocorrelation circuit configured for generating an autocorrelation result from samples of received short preamble symbols in a received data packet, where the autocorrelation circuit generates each autocorrelation result based on accumulation of the samples having been received for the short preamble symbols. Hence, by using all received samples of the short preamble symbols, the autocorrelation based on accumulated samples minimizes the effect of noise and provides a more accurate coarse frequency estimation result.

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:

7582611, Sep 1, 2009

Filed:

May 2, 2006

Appl. No.:

11/416519

Inventors:

Yaoquan Liu - Castro Valley CA, US
Christopher Carreras - Belmont CA, US
David C. Myles - Kensington CA, US
Yong Li - Palo Alto CA, US
Simon James Shaw - San Francisco CA, US
Hong Fu - Union City CA, US
Yue Chen - Hayward CA, US
Hao Zheng - Hayward CA, US
Yandong Li - San Jose CA, US
Mark A. Burlingame - Oakland CA, US

Assignee:

Pfizer Inc. - New York NY

International Classification:

A61K 31/70
C07H 17/08

US Classification:

514 29, 536 72, 536 73, 536 74

Abstract:

Compounds having a structure according to formula (I).