Patents by Inventor Keng Chen

Keng Chen 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).

  • Patent number: 8587203
    Abstract: Multiple output channel light source power supply circuits, and methods for protecting, are provided. A front end circuit receives an input voltage and provides a regulated front end DC voltage (FEDC). Voltage converter circuits (VCCs) receive the FEDC and provide a separate associated DC output for each associated output channel. A protection switch is coupled between. In its conducting state, the FEDC is coupled to the VCCs. In its non-conducting state, the FEDC is decoupled. A current sense circuit of a current sensor in parallel with a bypass switch is coupled to the VCCs to provide a current sense output representing current through at least one VCC. A controller circuit places the protection switch in the non-conducting state in response to the current sense output. The bypass switch may be placed in a conducting state to shunt current around the current sensor during normal operation to reduce or eliminate inefficiency.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: November 19, 2013
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Keng Chen, Christian Breuer, Peng Xiao
  • Publication number: 20130304965
    Abstract: A storage unit management method for managing a plurality of physical units in a rewritable non-volatile memory module is provided, wherein the physical units are at least grouped into a data area and a spare area. The method includes configuring a plurality of logical units for mapping to the physical units belonging to the data area, and determining whether the rewritable non-volatile memory module contains cold data. The method further includes performing a first wear-leveling procedure on the physical units if it is determined that the rewritable non-volatile memory module does not contain any cold data, and performing a second wear-leveling procedure on the physical units if it is determined that the rewritable non-volatile memory module contains the cold data.
    Type: Application
    Filed: July 30, 2012
    Publication date: November 14, 2013
    Applicant: PHISON ELECTRONICS CORP.
    Inventors: Chih-Kang Yeh, Yi-Keng Chen
  • Publication number: 20130295193
    Abstract: A preparation at least useful as a bone implant is provided, which contains a solid component including a lithium compound and a calcium compound. The preparation shows an anti-bacterial ability in comparison with a preparation contains the calcium compound but free of the lithium compound.
    Type: Application
    Filed: May 6, 2013
    Publication date: November 7, 2013
    Applicant: NATIONAL CHENG KUNG UNIVERSITY
    Inventors: Jiin-Huey Chern-Lin, Chien-Ping Ju, Chang-Keng Chen, Bing-Chen Yang
  • Publication number: 20130078092
    Abstract: A method for controlling rotation speed of a vertical axis windmill by using rotating centrifugal force of blades comprises the steps of a. forming the rotor blades; b. rotation of the rotor blades; and c. lift control. A device for controlling rotation speed of the vertical axis windmill comprises a plate mounted on each of the rotor blades, then an elastic lift control device provides an elasticity to press the plate against the rotor blades, and the centrifugal force produced by the rotation of the vertical axis windmill counteracts the elasticity, so as to create an automatically adjustable, passively controlled and durable windmill.
    Type: Application
    Filed: September 15, 2012
    Publication date: March 28, 2013
    Inventors: Cheng-Keng CHEN, Ming-Guo CHEN
  • Publication number: 20130049462
    Abstract: Systems and methods for a multichannel power supply are disclosed. The multichannel power supply includes a front end circuit configured to receive an input voltage and to provide a regulated front end direct current (DC) voltage. A multichannel source circuit is coupled to the front-end circuit. The multichannel source circuit includes a controller, a reference voltage circuit, and a plurality of source circuits. Each source circuit in the plurality of source circuits represents a distinct output channel of the multichannel power supply. The multichannel source circuit is configured to generate a constant current output for each source circuit in the plurality of source circuits. Each load in a plurality of loads is connected to a corresponding source circuit in the plurality of source circuits and is configured to receive the corresponding constant current output via the corresponding source circuit.
    Type: Application
    Filed: August 24, 2012
    Publication date: February 28, 2013
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Keng Chen, Christian Breuer
  • Publication number: 20120313528
    Abstract: Multiple output channel light source power supply circuits, and methods for protecting the output channels, are provided. A front end circuit receivess an input voltage and provides a regulated front end DC voltage. A plurality of voltage converter circuits are each configured to receive the regulated front end DC voltage and provide a separate associated DC output for an associated one of the multiple output channels. A protection switch is coupled therebetween, and includes a conducting state, to couple the front end DC voltage to the plurality of voltage converter circuits, and a non-conducting state, to decouple the front end DC voltage. A current sense circuit is coupled to the voltage converter circuits, and provides a current sense output representative of current through at least one voltage converter circuit. A controller circuit places the protection switch in the non-conducting state in response to the current sense output.
    Type: Application
    Filed: February 24, 2012
    Publication date: December 13, 2012
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Keng Chen, Christian Breuer, Peng Xiao
  • Publication number: 20120313529
    Abstract: Multiple output channel light source power supply circuits, and methods for protecting, are provided. A front end circuit receives an input voltage and provides a regulated front end DC voltage (FEDC). Voltage converter circuits (VCCs) receive the FEDC and provide a separate associated DC output for each associated output channel. A protection switch is coupled between. In its conducting state, the FEDC is coupled to the VCCs. In its non-conducting state, the FEDC is decoupled. A current sense circuit of a current sensor in parallel with a bypass switch is coupled to the VCCs to provide a current sense output representing current through at least one VCC. A controller circuit places the protection switch in the non-conducting state in response to the current sense output. The bypass switch may be placed in a conducting state to shunt current around the current sensor during normal operation to reduce or eliminate inefficiency.
    Type: Application
    Filed: April 17, 2012
    Publication date: December 13, 2012
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Keng Chen, Christian Breuer, Peng Xiao
  • Publication number: 20120314463
    Abstract: A power supply protected against open circuit conditions at its output terminals, and methods for so protecting, are disclosed. A front end circuit receives an input voltage and provides a regulated front end DC voltage to a voltage converter circuit, which in turn provides a DC output voltage to the output terminals to drive a light source. An open circuit protection circuit is coupled between the voltage converter circuit and the output terminals. It has a non-conducting state to couple the DC output voltage to the output terminals, and a conducting state to establish a short circuit across the output terminals in response to charging of a capacitor during an open circuit condition at the output terminals. A restart circuit intermittently discharges the capacitor during the open circuit condition to place the open circuit protection circuit in the non-conducting state when the open circuit condition is resolved.
    Type: Application
    Filed: June 7, 2012
    Publication date: December 13, 2012
    Applicant: OSRAM SYLVANIA INC.
    Inventor: Keng Chen
  • Publication number: 20110216014
    Abstract: A multimedia wireless touch control device includes a G-sensor, a touch pad, a wireless transmit module, and also includes an electric power storage. The electric power storage supply the wireless touch control device with electric power when it is used separately, and in this instance, the wireless touch control device can send wireless signal to the device by a wireless transmitter. All of the above mentioned parts compose a portable touch control device which providing wireless transmission functions. The G-sensor can induct the gradient of the wireless touch control device for providing the wireless touch control device with operation functions like scroll bar and the resolution adjust. The functions of the present invention can replace the input functions of computer keyboard, the functions of computer mouse and multimedia wireless touch control device, it also can replace the functions of handwritten board, joystick and multimedia remote control device.
    Type: Application
    Filed: March 5, 2010
    Publication date: September 8, 2011
    Inventors: Chih-Meng WU, Shun-Keng Chen
  • Patent number: 7738027
    Abstract: An auto focus method. A step length for a driving motor and a track length are defined and a storage medium is provided. The driving motor is shifted to an initial position and the storage medium is cleaned. The driving motor sequentially shifts a focus lens to a plurality of sampling positions based on the step length. A plurality of evaluation values corresponding to each sampling position and a plurality of step lengths corresponding to each evaluation value for a desired image are recorded in the storage medium. A weighted average is calculated according to the evaluation values and the step lengths recorded in the storage medium using a statistical formula. The driving motor shifts the focus lens to a focus position according to the weighted average.
    Type: Grant
    Filed: June 26, 2006
    Date of Patent: June 15, 2010
    Assignee: Asia Optical Co., Inc.
    Inventors: Ching-Yuan Cho, Feng-Keng Chen
  • Publication number: 20060290805
    Abstract: An auto focus method. A step length for a driving motor and a track length are defined and a storage medium is provided. The driving motor is shifted to an initial position and the storage medium is cleaned. The driving motor sequentially shifts a focus lens to a plurality of sampling positions based on the step length. A plurality of evaluation values corresponding to each sampling position and a plurality of step lengths corresponding to each evaluation value for a desired image are recorded in the storage medium. A weighted average is calculated according to the evaluation values and the step lengths recorded in the storage medium using a statistical formula. The driving motor shifts the focus lens to a focus position according to the weighted average.
    Type: Application
    Filed: June 26, 2006
    Publication date: December 28, 2006
    Applicant: ASIA OPTICAL CO., INC.
    Inventors: Ching-Yuan Cho, Feng-Keng Chen
  • Patent number: 7049334
    Abstract: A method for enhancing learning and memory or treating amnesia. The method includes administrating to a subject in need thereof a compound of the formula (I): A is H, R, or ?each of Ar1, Ar2, and Ar3, independently, is phenyl, thienyl, furyl, or pyrrolyl; each of R1, R2, R3, R4, R5, and R6, independently, is H, nitro, halogen, R, OH, OR, C(O)OH, C(O)OR, C(O)SH, C(O)SR, C(O)NH2, C(O)NHR, C(O)NRR?, ROH, ROR?, RSH, RSR?, ROC(O)R?OH, NHR, NRR?, RNHR?, or RNR?R?; or R1 and R2 together, R3 and R4 together, or R5 and R6 together are ORO; wherein each of R, R?, and R?, independently is C1˜C6 alkyl; and n is 1, 2, or 3. The compound is in an effective amount for enhancing learning and memory or treating amnesia.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: May 23, 2006
    Assignee: Carlsbad Technology, Inc.
    Inventors: Wen-Mei Fu, Keng-Chen Liang, Wei-Lin Chien, Sheng-Chu Kuo, Fang-Yuan Lee, Che-Ming Teng
  • Publication number: 20050035086
    Abstract: A method of upgrading an aluminide coating on a used turbine engine component to a platinum aluminide coating. The method involves cleaning at least one surface of the component to remove hot corrosion products from the surface without damaging the aluminide coating. In one embodiment, the cleaning step involves immersing the component in a heated solution comprising acetic acid while agitating the solution using ultrasonic energy. A layer of platinum is then deposited onto the cleaned surface of the component. A second aluminide coating is then formed on the surface of the component to upgrade the component. The invention also relates to a turbine engine component, e.g., a turbine blade, having a metal-based substrate and a platinum aluminide coating on at least one surface thereof, which coating has been upgraded from an aluminide coating originally on the component using the above method.
    Type: Application
    Filed: August 11, 2003
    Publication date: February 17, 2005
    Inventors: Keng Chen, Shih-Tung Ngiam
  • Publication number: 20030105149
    Abstract: A method for enhancing learning and memory or treating amnesia.
    Type: Application
    Filed: September 13, 2002
    Publication date: June 5, 2003
    Inventors: Wen-Mei Fu, Keng-Chen Liang, Wei-Lin Chien, Sheng-Chu Kuo, Fang-Yuan Lee, Che-Ming Teng