Patents by Inventor Yonghan Kang

Yonghan Kang 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).

  • Power sharing network communications device
    Patent number: 8310089
    Abstract: A set of network communications devices shares available power among themselves to meet overall system power loading. An individual device is configured to include a local power supply delivering power to a local power bus at a local supply voltage varied in response to a voltage control signal. A protection component is connected between the local power bus and an external power cable used to connect the device to another device for sharing power. The protection component provides an interruptible low-impedance DC path for carrying current based on direction and magnitude of a voltage difference between the local power bus and the external power cable.
    Type: Grant
    Filed: May 3, 2010
    Date of Patent: November 13, 2012
    Assignee: Cisco Technology, Inc.
    Inventors: Frederick Roland Schindler, Rudolph B. Klecka, III, Scott Lawrence Lennartz, John Alvin Herrmann, Yonghan Kang, Dylan Walker, Johnston Reid McGaughey
  • POWER-SHARING NETWORK COMMUNICATIONS DEVICE
    Publication number: 20110266867
    Abstract: A set of network communications devices shares available power among themselves to meet overall system power loading. An individual device is configured to include a local power supply delivering power to a local power bus at a local supply voltage varied in response to a voltage control signal. A protection component is connected between the local power bus and an external power cable used to connect the device to another device for sharing power. The protection component provides an interruptible low-impedance DC path for carrying current based on direction and magnitude of a voltage difference between the local power bus and the external power cable.
    Type: Application
    Filed: May 3, 2010
    Publication date: November 3, 2011
    Applicant: CISCO TECHNOLOGY INC.
    Inventors: Frederick Roland Schindler, Rudolph B. Klecka, III, Scott Lawrence Lennartz, John Alvin Herrmann, Yonghan Kang, Dylan Walker, Johnston Reid McGaughey
  • DC-DC converter with over-voltage protection
    Patent number: 7420355
    Abstract: A DC-DC converter includes a control circuit for generating a pulse width modulated signal based on a voltage of an output node. A first switch is connected to conduct during pulses, and a second switch conducts between pulses. The first switch is connected to an internal power node and the second is connected to a current return node. There is a common node between the first switch and the second switch. The voltage of the common node is supplied to an output node. An input power switch supplies voltage to the internal power node. An over-voltage protection circuit is connected to receive an over-voltage fault signal from the control circuit, and it is connected to control a bias of the control terminal of the input power switch to cause the input power switch not to conduct during an event causing an over-voltage fault signal, whereby a load connected to the output node is protected.
    Type: Grant
    Filed: July 11, 2006
    Date of Patent: September 2, 2008
    Assignee: Artesyn Technologies, Inc.
    Inventors: Jiangang Liu, Yonghan Kang
  • DC-DC converter with over-voltage protection
    Publication number: 20080012542
    Abstract: A DC-DC converter includes a control circuit for generating a pulse width modulated signal based on a voltage of an output node. A first switch is connected to conduct during pulses, and a second switch conducts between pulses. The first switch is connected to an internal power node and the second is connected to a current return node. There is a common node between the first switch and the second switch. The voltage of the common node is supplied to an output node. An input power switch supplies voltage to the internal power node. An over-voltage protection circuit is connected to receive an over-voltage fault signal from the control circuit, and it is connected to control a bias of the control terminal of the input power switch to cause the input power switch not to conduct during an event causing an over-voltage fault signal, whereby a load connected to the output node is protected.
    Type: Application
    Filed: July 11, 2006
    Publication date: January 17, 2008
    Inventors: Jiangang Liu, Yonghan Kang