Patents by Inventor Han-Sheng Wei

Han-Sheng Wei 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).

  • UPS system having a function of parallel operation
    Patent number: 8076799
    Abstract: A UPS system includes one or more UPS units with identical or different capacities. A control circuit, used to control a DC/AC inverter of the UPS unit, includes a voltage feedback control circuit and a current feedforward control circuit. The voltage feedback control circuit is used to control the amplitude and the waveform of load voltage. The current feedforward control circuit is used to operate the DC/AC inverter of the UPS unit as a virtual fundamental resistor and a virtual harmonic resistor which are serially connected to an output terminal of the DC/AC inverter such that each UPS unit can be distributed to provide an output current according to the capacity ratio of the UPS system.
    Type: Grant
    Filed: August 19, 2008
    Date of Patent: December 13, 2011
    Assignee: Ablerex Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Yu-Hsiu Lin, Wen-Jie Hou, Han-Sheng Wei
  • Active power conditioner
    Patent number: 7570029
    Abstract: An active power conditioner includes a first power electronic switch set, a second power electronic switch set, a third power electronic switch set, an input filter and an output filter. The active power conditioner can supply a stable AC voltage to a load when a voltage variation occurs at an AC power source by controlling either the second power electronic switch set or the third power electronic switch set via high-frequency switching, and the other power electronic switch sets that are not switched in high frequency are controlled to switch in low-frequency switching.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: August 4, 2009
    Assignee: Ablerex Electronics Co., Ltd.
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Min-Sheng Huang, Han-Sheng Wei, Ya-Tsung Feng
  • UPS System having a Function of Parallel Operation
    Publication number: 20090174260
    Abstract: A UPS system includes one or more UPS units with identical or different capacities. A control circuit, used to control a DC/AC inverter of the UPS unit, includes a voltage feedback control circuit and a current feedforward control circuit. The voltage feedback control circuit is used to control the amplitude and the waveform of load voltage. The current feedforward control circuit is used to operate the DC/AC inverter of the UPS unit as a virtual fundamental resistor and a virtual harmonic resistor which are serially connected to an output terminal of the DC/AC inverter such that each UPS unit can be distributed to provide an output current according to the capacity ratio of the UPS system.
    Type: Application
    Filed: August 19, 2008
    Publication date: July 9, 2009
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Yu-Hsiu Lin, Wen-Jie Hou, Han-Sheng Wei
  • Active Power Conditioner
    Publication number: 20080253153
    Abstract: An active power conditioner includes a first power electronic switch set, a second power electronic switch set, a third power electronic switch set, an input filter and an output filter. The active power conditioner can supply a stable AC voltage to a load when a voltage variation is occurred at an AC power source by controlling either the second power electronic switch set or the third power electronic switch set via high-frequency switching, and the other power electronic switch sets that are not switched in high frequency are controlled to switch in low-frequency switching.
    Type: Application
    Filed: December 21, 2007
    Publication date: October 16, 2008
    Inventors: Chin-Chang Wu, Hung-Liang Chou, Min-Sheng Huang, Han-Sheng Wei, Ya-Tsung Feng