Patents by Inventor Chenghung Pan

Chenghung Pan 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).

  • Publication number: 20200221548
    Abstract: A light fixture includes a sensor such as an audio, temperature, or vibration sensor positioned to sense a possible emergency condition in an environment illuminated by a light source that receives electrical power through a power line from a remote power source. A controller in the light fixture receives a sensing result from the sensor and controls brightness from the light source so that the electrical power drawn through the power line varies in a manner that encodes the sensing result. A remote reporting unit connected to the power line can measure the power drawn, decode the sensing result, and report the sensing result through a network such as the Internet to a target such as an emergency response system.
    Type: Application
    Filed: August 13, 2019
    Publication date: July 9, 2020
    Inventor: Chenghung Pan
  • Patent number: 9451664
    Abstract: An adaptive switch mode LED driver provides an intelligent approach to driving multiple strings of LEDs. The LED driver determines an optimal current level for each LED channel from a limited set of allowed currents. The LDO driver then determines a PWM duty cycle for driving the LEDs in each LED channel to provide precise brightness control over the LED channels. Beneficially, the LED driver minimizes the power dissipation in the LDO circuits driving each LED string, while also ensuring that the currents in each LED string are maintained within a limited range. A sample and hold LDO allows PWM control over extreme duty cycles with very fast dynamic response. Furthermore, fault protection circuitry ensures fault-free startup and operation of the LED driver.
    Type: Grant
    Filed: November 13, 2012
    Date of Patent: September 20, 2016
    Assignee: Dialog Semiconductor Inc.
    Inventors: Xuecheng Jin, Yu Cheng Chang, Yang Li, Maofeng Lan, John W. Kesterson, Xiaoyan Wang, Chenghung Pan
  • Publication number: 20130127344
    Abstract: An adaptive switch mode LED driver provides an intelligent approach to driving multiple strings of LEDs. The LED driver determines an optimal current level for each LED channel from a limited set of allowed currents. The LDO driver then determines a PWM duty cycle for driving the LEDs in each LED channel to provide precise brightness control over the LED channels. Beneficially, the LED driver minimizes the power dissipation in the LDO circuits driving each LED string, while also ensuring that the currents in each LED string are maintained within a limited range. A sample and hold LDO allows PWM control over extreme duty cycles with very fast dynamic response. Furthermore, fault protection circuitry ensures fault-free startup and operation of the LED driver.
    Type: Application
    Filed: November 13, 2012
    Publication date: May 23, 2013
    Inventors: Xuecheng Jin, Yu Chong Chang, Yang Li, Maofeng Lan, John W. Kesterson, Xiaoyan Wang, Chenghung Pan
  • Patent number: 8334662
    Abstract: An adaptive switch mode LED driver provides an intelligent approach to driving multiple strings of LEDs. The LED driver determines an optimal current level for each LED channel from a limited set of allowed currents. The LDO driver then determines a PWM duty cycle for driving the LEDs in each LED channel to provide precise brightness control over the LED channels. Beneficially, the LED driver minimizes the power dissipation in the LDO circuits driving each LED string, while also ensuring that the currents in each LED string are maintained within a limited range. A sample and hold LDO allows PWM control over extreme duty cycles with very fast dynamic response. Furthermore, fault protection circuitry ensures fault-free startup and operation of the LED driver.
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: December 18, 2012
    Assignee: iWatt Inc.
    Inventors: Xuecheng Jin, Yu Cheng Chang, Yang Li, Maofeng Lan, John W. Kesterson, Xiaoyan Wang, Chenghung Pan
  • Publication number: 20110062872
    Abstract: An adaptive switch mode LED driver provides an intelligent approach to driving multiple strings of LEDs. The LED driver determines an optimal current level for each LED channel from a limited set of allowed currents. The LDO driver then determines a PWM duty cycle for driving the LEDs in each LED channel to provide precise brightness control over the LED channels. Beneficially, the LED driver minimizes the power dissipation in the LDO circuits driving each LED string, while also ensuring that the currents in each LED string are maintained within a limited range. A sample and hold LDO allows PWM control over extreme duty cycles with very fast dynamic response. Furthermore, fault protection circuitry ensures fault-free startup and operation of the LED driver.
    Type: Application
    Filed: September 11, 2009
    Publication date: March 17, 2011
    Inventors: Xuecheng Jin, Yu Cheng Chang, Yang Li, Maofeng Lan, John W. Kesterson, Xiaoyan Wang, Chenghung Pan