Zheren Lai from 1905 Harrington Dr, Plano, TX 75075, age 57, Phone: 972 519-9648

Us Patents

Li-Ion/Li-Polymer Battery Charger Configured To Be Dc-Powered From Multiple Types Of Wall Adapters
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US Patent:

6844705, Jan 18, 2005
Filed:

Dec 9, 2002
Appl. No.:

10/314543
Inventors:

Zheren Lai - Foothill Ranch CA, US
Edward Bordeaux - Chapel Hill NC, US
Zen Wu - Irvine CA, US
Assignee:

Intersil Americas Inc. - Milpitis CA
International Classification:

H02J 700
G05F 140
US Classification:

320137, 323286
Abstract:

A battery charger controller is coupled to DC output terminals of an AC-DC (or DC-DC) adapter containing an AC-DC (or DC-DC) converter. A controlled current flow path between input and output terminals of the battery charger controller circuit is controlled to provide a substantially constant current to charge the battery to a nominal battery voltage. When a constant voltage output of the said adapter transitions to a value that limits available charging current to a value less than programmed constant charging current, current flow drive for the controlled current flow path is increased for a limited time interval. Thereafter, the controlled current flow path gradually reduces charging current as the battery voltage remains at its nominal battery voltage until the charge is complete or otherwise terminated.

Li-Ion/Li-Polymer Battery Charger Configured To Be Dc-Powered From Multiple Types Of Wall Adapters
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US Patent:

6917184, Jul 12, 2005
Filed:

May 20, 2004
Appl. No.:

10/850206
Inventors:

Zheren Lai - Foothill Ranch CA, US
Edward Bordeaux - Chapel Hill NC, US
Zen Wu - Irvine CA, US
Assignee:

Intersil Americas Inc. - Milpitas CA
International Classification:

H02J007/00
US Classification:

320125
Abstract:

A battery charger controller is coupled to DC output terminals of an AC-DC (or DC-DC) adapter containing an AC-DC (or DC-DC) converter. A controlled current flow path between input and output terminals of the battery charger controller circuit is controlled to provide a substantially constant current to charge the battery to a nominal battery voltage. When a constant voltage output of the said adapter transitions to a value that limits available charging current to a value less than programmed constant charging current, current flow drive for the controlled current flow path is increased for a limited time interval. Thereafter, the controlled current flow path gradually reduces charging current as the battery voltage remains at its nominal battery voltage until the charge is complete or otherwise terminated.

Li-Ion/Li-Polymer Battery Charger Configured To Be Dc-Powered From Multiple Types Of Wall Adapters
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US Patent:

6998820, Feb 14, 2006
Filed:

Mar 23, 2005
Appl. No.:

11/087882
Inventors:

Zheren Lai - Foothill Ranch CA, US
Edward Bordeaux - Chapel Hill NC, US
Zen Wu - Irvine CA, US
Assignee:

Intersil Americas Inc. - Milpitas CA
International Classification:

H02J 7/00
US Classification:

320137
Abstract:

A battery charger controller is coupled DC output terminals of an AC-DC (or DC-DC) adapter containing an AC-DC (or DC-DC) converter. A controlled current flow path between input and output terminals of the battery charger controller circuit is controlled to provide a substantially constant current to charge the battery to a nominal battery voltage. When a constant voltage output of the said adapter transitions to a value that limits available charging current to a value less than programmed constant charging current, current flow drive for the controlled current flow path is increased for a limited time interval. Thereafter, the controlled current flow path gradually reduces charging current as the battery voltage remains at its nominal battery voltage until the charge is complete or otherwise terminated.

Li-Ion/Li-Polymer Battery Charger Configured To Be Dc-Powered From Multiple Types Of Wall Adapters
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US Patent:

7141954, Nov 28, 2006
Filed:

Nov 30, 2005
Appl. No.:

11/290018
Inventors:

Zheren Lai - Foothill Ranch CA, US
Edward Bordeaux - Chapel Hill NC, US
Zen Wu - Irvine CA, US
Assignee:

Intersil Americas Inc. - Milpitas CA
International Classification:

H02J 7/00
US Classification:

320128
Abstract:

A battery charger controller is coupled to DC output terminals of an AC-DC (or DC-DC) adapter containing an AC-DC (or DC-DC) converter. A controlled current flow path between input and output terminals of the battery charger controller circuit is controlled to provide a substantially constant current to charge the battery to a nominal battery voltage. When a constant voltage output of the said adapter transitions to a value that limits available charging current to a value less than programmed constant charging current, current flow drive for the controlled current flow path is increased for a limited time interval. Thereafter, the controlled current flow path gradually reduces charging current as the battery voltage remains at its nominal battery voltage until the charge is complete or otherwise terminated.

Over Voltage And Over Current Protection Integrated Circuit
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US Patent:

7394223, Jul 1, 2008
Filed:

Jun 3, 2005
Appl. No.:

11/144568
Inventors:

Zheren Lai - Foothill Ranch CA, US
Hsien Yi Chou - Shihlin, TW
Zengjing Wu - Irvine CA, US
Assignee:

Intersil Americas Inc. - Milpitas CA
International Classification:

H02J 7/00
H02H 3/20
H02H 3/00
US Classification:

320134, 320136, 361 90, 361 911, 361101
Abstract:

An integrated circuit is disclosed including a primary input for receiving an input voltage, a battery voltage input for receiving a battery voltage signal and an output for providing an output voltage higher than the battery voltage. First circuitry responsive to the input voltage is provided for turning off the output voltage responsive to an input over voltage condition. Second circuitry responsive to the battery voltage signal is provided for turning off the output voltage responsive to a battery over voltage condition. Third circuitry provides for over current protection.

Over Voltage And Over Current Protection Integrated Circuit
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US Patent:

8232772, Jul 31, 2012
Filed:

May 27, 2008
Appl. No.:

12/127283
Inventors:

Zheren Lai - Foothill Ranch CA, US
Hsien Yi Chou - Shihlin 111, TW
Zengjing Wu - Irvine CA, US
Assignee:

Intersil Americas Inc. - Milpitas CA
International Classification:

H02J 7/00
US Classification:

320134, 320136
Abstract:

An integrated circuit is disclosed including a primary input for receiving an input voltage, a battery voltage input for receiving a battery voltage signal and an output for providing an output voltage higher than the battery voltage. First circuitry responsive to the input voltage is provided for turning off the output voltage responsive to an input over voltage condition. Second circuitry responsive to the battery voltage signal is provided for turning off the output voltage responsive to a battery over voltage condition. Third circuitry provides for over current protection.

One Cycle Control Of Bipolar Switching Power Amplifiers
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US Patent:

56173067, Apr 1, 1997
Filed:

Mar 2, 1995
Appl. No.:

8/396500
Inventors:

Zheren Lai - Irvine CA
Keyue M. Smedley - Irvine CA
Assignee:

The Regents of the University of California - Oakland CA
International Classification:

H02M 3335
US Classification:

363 17
Abstract:

A one cycle control for controlling DC-to-AC switching converters is achieved by forcing the average of a controlled switched variable to be exactly equal to the control reference in each switching cycle. Potential subharmonic oscillations in a switching power amplifier which occurs in the DC-to-AC application of this method is prevented by adding an offset voltage to the averaged controlled switched variable which is fed back and compared to a control reference, which compares and is then used to switch the switching power amplifier. Switching errors are corrected by resetting the integrator which averages the controlled switched variable and a time interval at least an order or magnitude less than the switching time of the switches in the switching power amplifier.

General Constant Frequency Pulse-Width Modulators
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US Patent:

58865861, Mar 23, 1999
Filed:

Sep 5, 1997
Appl. No.:

8/924528
Inventors:

Zheren Lai - Irvine CA
Keyue M. Smedley - Irvine CA
Assignee:

The Regents of the University of California - Oakland CA
International Classification:

H03K 708
US Classification:

332109
Abstract:

A constant frequency pulse-width modulator that realizes various control schemes with trailing-edge, leading-edge or double-edge modulation is disclosed. This PWM modulator, which employs one or more integrator with reset stages, can be generally applied to implement feed-forward control of a family of converters, current mode control with linear or non linear compensating slope, and a family of unity-power-factor rectifiers at continuous or discontinuous conduction mode.