Patents by Inventor Tetsuro Ikeda

Tetsuro Ikeda 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: 6188585
    Abstract: A small-sized DC power supply apparatus adapted for receiving input commercial AC voltages of different value includes an AC-to-DC converter 4 which converts an input commercial AC voltage to a first DC voltage. The first DC voltage is converted to a high-frequency voltage in an inverter 10 including IGBTs 10a-10d which are rendered conductive when a conduction control signal is applied thereto. A transformer 12 transforms the high-frequency voltage, which is, then, converted to a second DC voltage in a high-frequency-to-DC converter 16 for application to a load 22. The conduction control signal with a pause period disposed therein is generated in a controller 14. The conduction control signal occurs at a fixed period. The pause period disposed between the successive occurrences of the conduction control signal becomes longer as the input commercial AC voltage is higher.
    Type: Grant
    Filed: February 18, 2000
    Date of Patent: February 13, 2001
    Assignee: Sansha Electric Manufacturing Company Limited
    Inventors: Tetsuro Ikeda, Kenzo Danjo, Yuji Ikejiri
  • Patent number: 6181576
    Abstract: A rectifier 4 develops a rectified voltage between output terminals thereof. Capacitors 6a and 6b are connected in series between the output terminals of the rectifier. Inverters 8a and 8b convert DC voltages across the associated ones of the capacitors 6a and 6b into high-frequency voltages, which are, then, voltage transformed. The transformed voltages are rectified by diodes 24a and 24b for application to an arc-utilizing apparatus. Inverter control circuits 38a and 38b control the inverters 8a and 8b, respectively, in such a manner as to make current-representative signals from current detectors 50a and 50b equal to a reference signal, respectively. A voltage divider 54 is connected in parallel with the series combination of the capacitors 6a and 6b. Voltage detectors 62a and 62b connected between the junction A of the capacitors 6a and 6b and the junction B of resistors of the voltage-divider 54 develop a voltage representative signal representative of the voltage between the junctions A and B.
    Type: Grant
    Filed: April 7, 2000
    Date of Patent: January 30, 2001
    Assignee: Sansha Electric Manufacturing Company Limited
    Inventors: Tetsuro Ikeda, Kenzo Danjo, Takamitsu Imahori
  • Patent number: 6091049
    Abstract: A power supply apparatus for use with an arc utilizing device includes capacitors coupled in series between outputs of a rectifying unit, and inverters each of which is coupled across a respective one of the capacitors. Each inverter converts a DC voltage from the capacitor into a high frequency voltage and applies it to a respective one of transformers. A converter converts an output voltage from each transformer into a DC voltage for application to a load. An output detector generates a signal representative of an output current supplied to the load. A first voltage detector generates a signal representative of a first voltage to be applied to the inverters. A second voltage detector generates a signal representative of a second voltage across one of the capacitors.
    Type: Grant
    Filed: June 30, 1999
    Date of Patent: July 18, 2000
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Tetsuro Ikeda, Takeshi Morimoto, Masayuki Ono
  • Patent number: 6069811
    Abstract: A DC power supply apparatus includes a rectifier circuit which rectifies an input commercial AC voltage. The rectifier output voltage is smoothed in a smoothing capacitor. The DC voltage from the capacitor is converted to a high-frequency voltage in an inverter. The high-frequency voltage from the inverter is voltage-transformed by a transformer into a voltage-transformed, high-frequency voltage, which is then converted back into a DC voltage in a high-frequency-to-DC converter circuit. When an input commercial AC voltage is applied to the DC power supply apparatus, a pre-charging circuit pre-charges the smoothing capacitor from the input AC voltage. If a voltage having a magnitude larger than a prescribed value is applied to the DC power supply apparatus, an overvoltage protection circuit renders the rectifier circuit and the pre-charging circuit inoperative.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: May 30, 2000
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Haruo Moriguchi, Toru Arai, Tetsuro Ikeda, Toshikazu Fujiyoshi, Masayuki Ono, Hideo Ishii
  • Patent number: 6054674
    Abstract: An AC voltage applied among power input supply terminals is rectified by a rectifier, and the rectified voltage is adapted to be reduced in a voltage-reducing converter with a switch connected in parallel with it. A switching circuit connect smoothing capacitors in series or parallel to the voltage-reducing converter. Inverters are connected in parallel with the respective smoothing capacitors. The output voltages of the inverters are voltage-transformed by transformers. The transformed voltages from the transformers are converted to DC voltages by converters. A control unit renders the voltage-reducing converter operative and causes the switching circuit to connect the smoothing capacitors in series when a third AC voltage is applied among the power supply input terminals.
    Type: Grant
    Filed: January 14, 1999
    Date of Patent: April 25, 2000
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Haruo Moriguchi, Tetsuro Ikeda, Toshikazu Fujiyoshi, Kenzo Danjo, Kunio Karino, Hideo Ishii
  • Patent number: 6051806
    Abstract: A power supply apparatus for welders includes an input-side AC-to-DC converter for converting an input commercial AC voltage into a DC voltage, which is, in turn, converted to a high-frequency voltage in an inverter. The high-frequency voltage is transformed to a high-frequency voltage having a desired magnitude in a transformer. The transformed high-frequency voltage is then converted back to a DC voltage in an output-side high-frequency-to-DC converter. The DC voltage is developed between output terminals of the power supply apparatus. A current detector detects the current flowing through the output terminals and develops a detected-current representative signal. A voltage detector detects the voltage between the output terminals and develops a detected-voltage representative signal. A CPU has three control modes and controls, in a first mode, the inverter in such a manner that the current representative signal becomes equal to a reference-current representative signal.
    Type: Grant
    Filed: January 25, 1999
    Date of Patent: April 18, 2000
    Assignee: Sansha Electric Manufacturing Co., Limited
    Inventors: Kunio Shikata, Masayuki Ono, Masao Katooka, Haruo Moriguchi, Tetsuro Ikeda, Kenzo Danjo, Atsushi Kinoshita, Fumi Noda, Hideo Ishii
  • Patent number: 5917711
    Abstract: DC power supply apparatus includes an input-side rectifier for converting an AC signal from an AC power supply into a DC signal. A DC-to-high-frequency converter converts the DC signal into a high frequency signal in response to a control signal from a control unit. An output-side rectifier converts the high frequency signal into a DC signal and applies it to a load. An input current detector detects an input current flowing through the input-side rectifier and generates a signal representative of the input current. A load current detector detects a load current flowing through the load and generates a signal representative of the load current.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: June 29, 1999
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Kunio Shikata, Haruo Moriguchi, Tetsuro Ikeda, Kenzo Danjo, Takeshi Omura, Hideo Ishii
  • Patent number: 4795674
    Abstract: An aqueous solution containing at least an amido-phosphazene compound and an acid catalyst is applied to a fabric comprising cellulosic fibers so that said amido-phosphazene compound adheres to the fabric in an amount of 1-10% by weight of the fabric and then thus treated fabric is subjected to drying, curing and soaping, thereby obtaining a fabric having soft hand and low in shrinkage after repeated washings which contains less than 6% of amido-phosphazene and less than 10 .mu./g of free formaldehyde and is less than 4% in shrinkage after washings of 45 times.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: January 3, 1989
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Tadao Sasakura, Otohiko Yamazoe, Sachio Othuka, Tetsuro Ikeda, Masaru Daimon, Shinjuro Tamura