Patents by Inventor Toyokazu Ueda

Toyokazu Ueda 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).

  • Semiconductor integrated circuit device
    Patent number: 7173476
    Abstract: The drain of a power transistor M1 is connected to the non-inverting input terminal of an operational amplifier A and the drain of a transistor M2 is connected to the inverting input terminal of the operational amplifier A to make substantially equal the drain voltages of the power transistor M1 and the transistor M2, of which the gates are connected together and of which the sources are connected together. The drain current of the transistor M2 is outputted via a detection terminal 13 as a current signal proportional to the drain current of the power transistor M1.
    Type: Grant
    Filed: February 24, 2004
    Date of Patent: February 6, 2007
    Assignee: Rohm Co., Ltd.
    Inventors: Seiichi Yamamoto, Norihiro Maeda, Toyokazu Ueda
  • Power element protection circuit and semiconductor device incorporating it
    Patent number: 6980044
    Abstract: Connected to a power element having a first electrode, a second electrode, and a control electrode, a power element protection circuit detects a voltage between the first and second electrodes of the power element and the current flowing through the power element, then logarithmically converts a current proportional to the detected voltage and a current proportional to the detected current individually, then adds the results together, then subtracts a predetermined value from the sum, then antilogarithmically converts the result with an antilogarithmic converter, and then limits the driving of the power element based on the output of the antilogarithmic converter.
    Type: Grant
    Filed: May 19, 2004
    Date of Patent: December 27, 2005
    Assignee: Rohm Co., Ltd.
    Inventors: Seiichi Yamamoto, Norihiro Maeda, Toyokazu Ueda
  • Power element protection circuit and semiconductor device incorporating it
    Publication number: 20040246043
    Abstract: Connected to a power element having a first electrode, a second electrode, and a control electrode, a power element protection circuit detects a voltage between the first and second electrodes of the power element and the current flowing through the power element, then logarithmically converts a current proportional to the detected voltage and a current proportional to the detected current individually, then adds the results together, then subtracts a predetermined value from the sum, then antilogarithmically converts the result with an antilogarithmic converter, and then limits the driving of the power element based on the output of the antilogarithmic converter.
    Type: Application
    Filed: May 19, 2004
    Publication date: December 9, 2004
    Inventors: Seiichi Yamamoto, Norihiro Maeda, Toyokazu Ueda
  • Semiconductor integrated circuit device
    Publication number: 20040164786
    Abstract: The drain of a power transistor M1 is connected to the non-inverting input terminal of an operational amplifier A and the drain of a transistor M2 is connected to the inverting input terminal of the operational amplifier A to make substantially equal the drain voltages of the power transistor M1 and the transistor M2, of which the gates are connected together and of which the sources are connected together. The drain current of the transistor M2 is outputted via a detection terminal 13 as a current signal proportional to the drain current of the power transistor M1.
    Type: Application
    Filed: February 24, 2004
    Publication date: August 26, 2004
    Applicant: ROHM CO., LTD.
    Inventors: Seiichi Yamamoto, Norihiro Maeda, Toyokazu Ueda