Patents by Inventor Tajsuke Uehara

Tajsuke Uehara 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: 5248904
    Abstract: A switching regulator soft start circuit and technique which eliminates variations in frequency and is capable of more appropriately preselecting a suitable operating frequency by using a timer which responds to a start signal by generating an initial condition release signal after a predetermined interval, a frequency divider for obtaining a desired oscillation frequency from the output of a switching regulator, and a first gate element connected to receive the output of the frequency divider and the initial condition release signal, and to provide as an output a gate control signal that varies in frequency corresponding to the frequency divider output whenever the initial condition release signal is off but provides a gate control that delivers undivided switching regulator signals when the initial condition release signal is on; and a gate circuit connected to receive oscillation frequency signals and the gate control signal to control the delivery of output signals.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: September 28, 1993
    Assignee: Seiko Epson Corporation
    Inventors: Hajime Miyazaki, Masaaki Handa, Tajsuke Uehara, Tsukasa Muranaka