Patents by Inventor Zheren Lai
Zheren Lai has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11641126Abstract: A system for charging a battery includes an adapter, and a charger coupled to receive power from the adapter, and to provide a charging current to the battery. The charger includes a power stage with a charge pump to provide the charging current, and a feedback circuit to provide a feedback signal to the adapter. The power stage can be one of: an adjustable current source with voltage clamp, and an adjustable voltage source with current clamp. The charge pump can be implemented as a voltage divider, so that an input adapter current is multiplied by a pre-defined divider ratio to provide the charging current. The charge pump can be one of: single-phase; and multi-phase.Type: GrantFiled: July 18, 2018Date of Patent: May 2, 2023Assignee: TEXAS INSTRUMENTS INCORPORATEDInventors: Zheren Lai, Jinrong Qian, Sai Bun Wong, Ryan Erik Lind, Alexander Lee McHale
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Patent number: 11476698Abstract: A system for charging a small-capacity battery from a large-capacity battery. The large-capacity battery subsystem and the small-capacity battery subsystem cooperate with each other in different stages of a charging cycle of the small-capacity battery. The large-capacity battery subsystem includes a large-capacity battery, a large-capacity battery charging circuit and a constant-voltage and constant-current circuit which generates either a constant voltage or a constant current. The small-capacity battery subsystem includes a small-capacity battery and a linear charging circuit which uses the constant voltage or the constant current to charge the small-capacity battery. The charging cycle of the small-capacity battery includes a CC stage and a CV stage. In the CC stage, the linear charging circuit meets the ideal diode characteristics and outputs a constant current. In the CV stage, the linear charging circuit meets the linear charging characteristics and outputs a constant voltage.Type: GrantFiled: April 27, 2022Date of Patent: October 18, 2022Assignee: SHENZHEN LOWPOWER SEMICONDUCTOR CO., LTD.Inventors: Zheren Lai, Xingke Dai
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Publication number: 20200266634Abstract: A system for charging a battery includes an adapter, and a charger coupled to receive power from the adapter, and to provide a charging current to the battery. The charger includes a power stage with a charge pump to provide the charging current, and a feedback circuit to provide a feedback signal to the adapter. The power stage can be one of: an adjustable current source with voltage clamp, and an adjustable voltage source with current clamp. The charge pump can be implemented as a voltage divider, so that an input adapter current is multiplied by a pre-defined divider ratio to provide the charging current. The charge pump can be one of: single-phase; and multi-phase.Type: ApplicationFiled: July 18, 2018Publication date: August 20, 2020Inventors: Zheren Lai, Jinrong Qian, Sai Bun Wong, Ryan Erik Lind, Alexander Lee McHale
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Patent number: 10621942Abstract: A display power circuit is provided. The display power circuit includes a power supply circuit that receives an input voltage and generates an output voltage to power a display. A power switching device couples the output voltage from the power supply circuit to provide a display voltage for the display. A monitor circuit generates a shut down signal based on a change of the output voltage relative to the input voltage exceeding a predetermined threshold indicating a short circuit condition of the display voltage. A control circuit disables the power switching device based on the shut down signal if the short circuit of the display voltage is detected.Type: GrantFiled: March 15, 2013Date of Patent: April 14, 2020Assignee: Texas Instruments IncorporatedInventors: Chenjie Ruan, Zheren Lai, Sang Kwon Kim, Yonghua Zhou
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Publication number: 20190115765Abstract: A system for charging a battery includes an adapter, and a charger coupled to receive power from the adapter, and to provide a charging current to the battery. The charger includes a power stage with a charge pump to provide the charging current, and a feedback circuit to provide a feedback signal to the adapter. The power stage can be one of: an adjustable current source with voltage clamp, and an adjustable voltage source with current clamp. The charge pump can be implemented as a voltage divider, so that an input adapter current is multiplied by a pre-defined divider ratio to provide the charging current. The charge pump can be one of: single-phase; and multi-phase.Type: ApplicationFiled: July 18, 2018Publication date: April 18, 2019Inventors: Zheren Lai, Jinrong Qian, Sai Bun Wong, Ryan Erik Lind, Alexander Lee McHale
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Publication number: 20130328854Abstract: A display power circuit is provided. The display power circuit includes a power supply circuit that receives an input voltage and generates an output voltage to power a display. A power switching device couples the output voltage from the power supply circuit to provide a display voltage for the display. A monitor circuit that generates a shut down signal based on a change of the output voltage relative to the input voltage exceeding a predetermined threshold indicating a short circuit condition of the display voltage. A control circuit disables the power switching device based on the shut down signal if the short circuit of the display voltage is detected.Type: ApplicationFiled: March 15, 2013Publication date: December 12, 2013Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: CHENJIE RUAN, ZHEREN LAI, SANG KWON KIM, YONGHUA ZHOU
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Patent number: 8232772Abstract: 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.Type: GrantFiled: May 27, 2008Date of Patent: July 31, 2012Assignee: Intersil Americas Inc.Inventors: Zheren Lai, Hsien Yi Chou, Zengjing Wu
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Publication number: 20080258691Abstract: 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.Type: ApplicationFiled: May 27, 2008Publication date: October 23, 2008Applicant: INTERSIL AMERICAS INC.Inventors: Zheren Lai, Hsien Yi Chou, Zengjing Wu
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Patent number: 7394223Abstract: 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.Type: GrantFiled: June 3, 2005Date of Patent: July 1, 2008Assignee: Intersil Americas Inc.Inventors: Zheren Lai, Hsien Yi Chou, Zengjing Wu
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Patent number: 7141954Abstract: 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.Type: GrantFiled: November 30, 2005Date of Patent: November 28, 2006Assignee: Intersil Americas Inc.Inventors: Zheren Lai, Edward Bordeaux, Zen Wu
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Publication number: 20060082344Abstract: 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.Type: ApplicationFiled: November 30, 2005Publication date: April 20, 2006Inventors: Zheren Lai, Edward Bordeaux, Zen Wu
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Patent number: 6998820Abstract: 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.Type: GrantFiled: March 23, 2005Date of Patent: February 14, 2006Assignee: Intersil Americas Inc.Inventors: Zheren Lai, Edward Bordeaux, Zen Wu
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Publication number: 20050269992Abstract: 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.Type: ApplicationFiled: June 3, 2005Publication date: December 8, 2005Inventors: Zheren Lai, Hsien Chou, Zengjing Wu
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Publication number: 20050162793Abstract: 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.Type: ApplicationFiled: March 23, 2005Publication date: July 28, 2005Inventors: Zheren Lai, Edward Bordeaux, Zen Wu
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Patent number: 6917184Abstract: 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.Type: GrantFiled: May 20, 2004Date of Patent: July 12, 2005Assignee: Intersil Americas Inc.Inventors: Zheren Lai, Edward Bordeaux, Zen Wu
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Patent number: 6844705Abstract: 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.Type: GrantFiled: December 9, 2002Date of Patent: January 18, 2005Assignee: Intersil Americas Inc.Inventors: Zheren Lai, Edward Bordeaux, Zen Wu
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Publication number: 20040212348Abstract: 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.Type: ApplicationFiled: May 20, 2004Publication date: October 28, 2004Applicant: Intersil Americas Inc.Inventors: Zheren Lai, Edward Bordeaux, Zen Wu
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Publication number: 20040108837Abstract: 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.Type: ApplicationFiled: December 9, 2002Publication date: June 10, 2004Applicant: Intersil Americas Inc.Inventors: Zheren Lai, Edward Bordeaux, Zen Wu
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Patent number: 6084450Abstract: A new nonlinear control technique that has one cycle response, does not need a resettable integrator in the control path, and has nearly constant switching frequency. It obtains one cycle response by forcing the error between the switched-variable and the control reference to zero each cycle, while the on-pulse of the controller is adjusted each cycle to ensure near constant switching frequency. The small switching frequency variation due to variations in the reference signal and supply voltage and delays in the circuit are quantified. Using double-edge modulation, the switching frequency variation is further reduced, thus the associated signal distortion is minimized. An experimental 0-20 kHz bandwidth, 95 Watt RMS power audio amplifier using the control method demonstrates the applicability of this control technique for high fidelity audio applications. The amplifier has a power supply ripple rejection (PSRR) of 63 dB at 120 Hz.Type: GrantFiled: February 13, 1998Date of Patent: July 4, 2000Assignee: The Regents of the University of CaliforniaInventors: K. Mark Smith, Zheren Lai, Keyue M. Smedley
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Patent number: RE46673Abstract: 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.Type: GrantFiled: July 31, 2014Date of Patent: January 16, 2018Assignee: INTERSIL AMERICAS LLCInventors: Zheren Lai, Hsien Yi Chou, Zengjing Wu