Harry M Rodriguez

US Patent:

6944034, Sep 13, 2005

Filed:

Jun 30, 2003

Appl. No.:

10/610977

Inventors:

Anatoly Shteynberg - San Jose CA, US
Junjie Zheng - Campbell CA, US
Harry Rodriguez - Gilroy CA, US
Mark D. Telefus - Orinda CA, US
Dongsheng Zhou - San Jose CA, US
Arthur J. Collmeyer - Incline Village NV, US

Assignee:

iWatt Inc. - Los Gatos CA

International Classification:

H02M003/335
G05F001/40

US Classification:

363 2113, 363 17, 363 95, 323282, 323299

Abstract:

A power converter delivers electrical power from an electrical power source to a load according to a plurality of operation modes corresponding to different levels of input voltage or output current. The power converter comprises a power stage for delivering the electrical power from the power source to the load, a switch in the power stage that electrically couples or decouples the load to the power source, and a switch controller coupled to the switch for controlling the on-times and off-times of the switch according to the plurality of operation modes. Each of the operation modes correspond to associated ranges of at least one of an input voltage to the power converter and an output current from the power converter, where the associated ranges are different for each of the operation modes.

US Patent:

6972969, Dec 6, 2005

Filed:

Aug 19, 2004

Appl. No.:

10/922661

Inventors:

Anatoly Shteynberg - San Jose CA, US
Junjie Zheng - Campbell CA, US
Harry Rodriguez - Gilroy CA, US
Mark D. Telefus - Orinda CA, US
Dongsheng Zhou - San Jose CA, US

Assignee:

iWatt, Inc. - Los Gatos CA

International Classification:

H02M003/335

US Classification:

363 2112, 363 2118, 363 97

Abstract:

A primary side sensing power control system and method that controls the current limit such that it is maintained within a small range for any acceptable input voltages and causes the output voltage of a PWM controller to drop as the output load increases when the current limit is reached.

US Patent:

6990000, Jan 24, 2006

Filed:

Sep 17, 2004

Appl. No.:

10/944014

Inventors:

Harry Rodriguez - Gilroy CA, US
Anatoly Shteynberg - San Jose CA, US
Mark D. Telefus - Orinda CA, US
Mark D. Eason - Hollister CA, US

Assignee:

iWatt Inc. - Los Gatos CA

International Classification:

H02M 7/529

US Classification:

363 97

Abstract:

An AC-to-DC power converter controller reconstructs the output voltage of the power converter without a sample-and-hold circuit or an opto-coupler. The controller includes an accumulation module for accumulating a difference value obtained by subtracting a first representation of an output voltage of the power converter corresponding to a first sampling timing from the output voltage value sampled at a second sampling timing subsequent to the first sampling timing to obtain a second representation of the output voltage of the power converter corresponding to the second sampling timing. The accumulation module may set the second representation of the output voltage to a predetermined maximum value if the output voltage value sampled at the second sampling timing exceeds the predetermined maximum value, or to a predetermined minimum value if the output voltage value sampled at the second sampling timing is less than the predetermined minimum value.

US Patent:

7149097, Dec 12, 2006

Filed:

Aug 17, 2005

Appl. No.:

11/206356

Inventors:

Anatoly Shteynberg - San Jose CA, US
Harry Rodriguez - Gilroy CA, US

Assignee:

SynDiTec, Inc. - Gilroy CA

International Classification:

H02M 5/42
H02M 3/335

US Classification:

363 16, 363 89

Abstract:

A switch mode AC/DC converter with input current shaped for unity power factor. Input current is modulated by input voltage, and input inductor and isolation transformer are driven with the same duty ratio, with a low voltage across bulk capacitor. This voltage is determined only by input voltage amplitude. Energy stored in the leakage inductance of the transformer is returned back to the internal DC source. A soft switching circuit is connected to the primary side, eliminating the need for high side drive. Sources of the main and auxiliary switches and primary winding of the transformer are connected to ground for easy primary voltage sensing. Overvoltage protection circuit of the output is connected to exclusively primary side signals. Secondary synchronous rectifier is driven by a circuit synchronized with the system clock. The circuit can be coupled to either the primary or the secondary winding of the isolation transformer.

US Patent:

7161816, Jan 9, 2007

Filed:

Aug 19, 2005

Appl. No.:

11/208323

Inventors:

Anatoly Shteynberg - San Jose CA, US
Junjie Zheng - Campbell CA, US
Harry Rodriguez - Gilroy CA, US
Mark D. Telefus - Orinda CA, US
Dongsheng Zhou - San Jose CA, US
Arthur J. Collmeyer - Incline Village NV, US

Assignee:

iWatt Inc. - Los Gatos CA

International Classification:

H02M 3/335

US Classification:

363 2113, 363 17, 363 95, 323282, 323299

Abstract:

A power converter delivers electrical power from an electrical power source to a load according to a plurality of operation modes corresponding to different levels of input voltage or output current. The power converter comprises a power stage for delivering the electrical power from the power source to the load, a switch in the power stage that electrically couples or decouples the load to the power source, and a switch controller coupled to the switch for controlling the on-times and off-times of the switch according to the plurality of operation modes. Each of the operation modes correspond to associated ranges of at least one of an input voltage to the power converter and an output current from the power converter, where the associated ranges are different for each of the operation modes.

US Patent:

7276861, Oct 2, 2007

Filed:

May 31, 2005

Appl. No.:

11/142859

Inventors:

Anatoly Shteynberg - San Jose CA, US
Harry Rodriguez - Gilroy CA, US

Assignee:

Exclara, Inc. - Santa Clara CA

International Classification:

G05F 1/00
G05F 1/40

US Classification:

315291, 315308, 315247, 315312, 315224, 323282, 323280, 323304

Abstract:

A system drives one or plurality of LEDs regulating their brightness by controlling LEDs average current or voltage. The system includes a switching power converter and an integrated digital regulator with at least one of electrical, thermal and optical feedbacks. The regulator is constructed as a hysteretic peak current mode controller for continuous mode of operation of the power converter. For discontinuous mode of operation of the power converter a pulse averaging sliding mode control is being used. Average LED current is measured by integrating LED pulse current at off time and hysteretically adjusting on time of the power switch. Input battery is protected from discharging at abnormally low impedance of the output.

US Patent:

7583035, Sep 1, 2009

Filed:

Aug 13, 2007

Appl. No.:

11/838186

Inventors:

Anatoly Shteynberg - San Jose CA, US
Harry Rodriguez - Gilroy CA, US

Assignee:

Exclara, Inc. - Santa Clara CA

International Classification:

G05F 1/00

US Classification:

315307, 315291, 315247, 315224, 315312

Abstract:

A system drives one or plurality of LEDs regulating their brightness by controlling LEDs average current or voltage. The system includes a switching power converter and an integrated digital regulator with at least one of electrical, thermal and optical feedbacks. The regulator is constructed as a hysteretic peak current mode controller for continuous mode of operation of the power converter. For discontinuous mode of operation of the power converter a pulse averaging sliding mode control is being used. Average LED current is measured by integrating LED pulse current at off time and hysteretically adjusting on time of the power switch. Input battery is protected from discharging at abnormally low impedance of the output.

US Patent:

7598685, Oct 6, 2009

Filed:

Sep 19, 2005

Appl. No.:

11/231126

Inventors:

Anatoly Shteynberg - San Jose CA, US
Harry Rodriguez - Gilroy CA, US

Assignee:

Exclara, Inc. - Santa Clara CA

International Classification:

H05B 37/02

US Classification:

315308, 315283, 315287, 315224, 315312

Abstract:

The present invention creates an LED driver in which all feedback signals are derived from a power stage media, and presents an isolated off-line LED driver with an accurate primary side controller only to power one or more LEDs. The present invention further provides an effective off-line LED driver comprising AC current shape controller with a minimum number of components. The present invention further provides a high quality luminous system based on LED drivers with the integrated synthesized optical feedback to compensate for imperfections of the LEDs as sources of light.