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).

  • Publication number: 20070284349
    Abstract: An arc welding apparatus includes a main power supply circuit for outputting an arc current, a control circuit for controlling the main power supply circuit, and a high-frequency voltage generating circuit for generating a high-frequency voltage. When an operation switch is turned on for a first time since the apparatus is powered on, the control circuit activates the main power supply circuit to output a high voltage, and the high-frequency voltage generating circuit to generate a high-frequency voltage. With the high voltage superimposed on the high-frequency voltage, the control circuit passes a welding arc current through a torch and a base material. The switch is then turned off, and the control circuit passes a pilot arc current through the torch and the base material. The switch is turned on again, and the control circuit activates the main power supply circuit to output a high voltage, thereby allowing smooth arc transition.
    Type: Application
    Filed: June 7, 2006
    Publication date: December 13, 2007
    Inventors: Hideo Ishii, Tetsuro Ikeda, Kenzo Danjo, Atsushi Kinoshita
  • Publication number: 20070217231
    Abstract: A power supply apparatus for use with arc-utilizing apparatuses includes a plurality of power supply blocks (2a, 2b) of the same capacity. Each power supply block (2a, 2b) includes an input-side rectifying circuit (4a, 4b), an inverter (10a, 10b), a transformer (12a, 12b), and an output-side rectifying circuit (18a, 18b). The inverter (10a, 10b) is controlled by a control circuit (30a, 30b) in such a manner that high-frequency current flowing the inverter (10a, 10b) or current flowing through the output-side rectifying circuit (18a, 18b) can correspond to a reference signal provided by a reference signal generator (34a, 34b). The outputs of the output-side rectifying circuits (18a, 18b) of the power supply blocks are connected in parallel with each other. The values of the reference signals generated by the reference signal generators (34a, 34b) are made always equal by the action of equipotential lines (40, 42).
    Type: Application
    Filed: March 20, 2006
    Publication date: September 20, 2007
    Inventors: Hideo Ishii, Tetsuro Ikeda, Kenzo Danjo, Yuji Ikejiri
  • Publication number: 20070194724
    Abstract: A rectifying circuit (18) converts inputted AC power to DC power. An inverter circuit (22) converts the DC power to high-frequency power in accordance with a switching control signal applied thereto from a control circuit (50). A voltage transformer (24) voltage-transforms the voltage of the high-frequency power. An output-side rectifying circuit (40) rectifies the voltage-transformed power. An output detecting circuit (34) detects the magnitude of the voltage of the rectified power, and a signal representative of the detected voltage is applied to the control circuit (50). The control circuit (50) generates such a switching control signal as to make the rectified power have a predetermined value. The value of the voltage from the rectifying circuit (18) is detected by an input detecting circuit (62), and a signal representative of the detected voltage is applied to the control circuit (50).
    Type: Application
    Filed: February 13, 2007
    Publication date: August 23, 2007
    Inventors: Hideo Ishii, Tetsuro Ikeda, Kenzo Danjo
  • Publication number: 20070165433
    Abstract: One of a plurality of voltages is adapted to be applied to power supply terminals (2a, 2b, 2c). A rectifying circuit (6) rectifies the applied voltage and develops a rectified voltage between the output terminals (6a, 6b) thereof. Inverters (16a, 16b) are connected into one of a plurality of inverter connections between the rectifier output terminals (6a, 6b) in response to one of a plurality of inverter connection indicative signals. The inverter connections are set to correspond to respective ones of the plurality of voltages, so that a predetermined voltage can be applied to each inverter whichever one of the plurality of voltages is applied to the power supply terminals. An inverter connection indicative signal generating circuit (34) is manually operated to generate a desired one of the inverter connection indicative signals. A thyristor (8) is disposed between the rectifier output terminals (6a, 6b) and the inverters (16a, 16b).
    Type: Application
    Filed: January 8, 2007
    Publication date: July 19, 2007
    Inventors: Masao Katooka, Tetsuro Ikeda, Kenzo Danjo, Takeshi Morimoto, Hideo Ishii
  • Patent number: 7109438
    Abstract: An input rectifier of a power supply apparatus rectifies a selected one of two, higher and lower AC voltages applied to it. First and second inverters are connected in the output of the input rectifier. A high-frequency transformer is connected to the output of each of the first and second inverters. An output rectifier is connected to the output of each of the high-frequency transformers. When the higher one of the two AC input voltages is applied to the input rectifier, a switching circuit connects the first and second inverters in series between output terminals of the input rectifier. When the lower AC voltage is applied to the input rectifier, the switching circuit connects the first and second inverters in parallel between the output terminals of the input rectifier. When the first and second inverters are connected in series between the output terminals of the input rectifier, a voltage balancing control unit operates to suppress imbalance between input voltages to the first and second inverters.
    Type: Grant
    Filed: June 4, 2004
    Date of Patent: September 19, 2006
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Hideo Ishii, Tetsuro Ikeda, Kenzo Danjo, Yuji Ikejiri
  • Publication number: 20060054610
    Abstract: Welding conditions are set for a power supply apparatus for use with a welding machine, using a control panel unit (96). A memory (105) stores therein welding conditions as set through the control unit (96), and holds the set welding conditions after turning off of a main power supply switch (1) of the power supply apparatus. Upon turning on of the main power switch (1) for starting welding, the welding conditions stored and held in the memory (105) are read out and set in the power supply apparatus.
    Type: Application
    Filed: September 16, 2005
    Publication date: March 16, 2006
    Inventors: Takeshi Morimoto, Kenzo Danjo, Yuji Ikejiri, Tetsuro Ikeda, Hideo Ishii
  • Publication number: 20040246755
    Abstract: An input rectifier of a power supply apparatus rectifies a selected one of two, higher and lower AC voltages applied to it. First and second inverters are connected in the output of the input rectifier. A high-frequency transformer is connected to the output of each of the first and second inverters. An output rectifier is connected to the output of each of the high-frequency transformers. When the higher one of the two AC input voltages is applied to the input rectifier, a switching circuit connects the first and second inverters in series between output terminals of the input rectifier. When the lower AC voltage is applied to the input rectifier, the switching circuit connects the first and second inverters in parallel between the output terminals of the input rectifier. When the first and second inverters are connected in series between the output terminals of the input rectifier, a voltage balancing control unit operates to suppress imbalance between input voltages to the first and second inverters.
    Type: Application
    Filed: June 4, 2004
    Publication date: December 9, 2004
    Inventors: Hideo Isii, Tetsuro Ikeda, Kenzo Danjo, Yuji Ikejiri
  • Patent number: 6774757
    Abstract: Metallic coils sheets (34, 36, 38) are planar and include center windows (34a, 36a, 38a). Slits (34b, 36b, 38b) extend outward through the respective sheets from the windows. Connection terminals (34c, 34d; 36c, 36d; 38c, 38d) are provided on the sheets at locations facing across the respective slits. The metallic coil sheets are stacked, and adjacent ones of the stacked metallic coil sheets are electrically connected by means of the connection terminals. A core (60, 62) is disposed in the windows of the stacked metallic coil sheets. The metallic coil sheets are individually covered with an insulating coating.
    Type: Grant
    Filed: May 27, 2003
    Date of Patent: August 10, 2004
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Toshikazu Fujiyoshi, Masao Katooka, Tetsuro Ikeda, Kenji Morimoto, Hideo Ishii
  • Publication number: 20030222751
    Abstract: Metallic coils sheets (34, 36, 38) are planar and include center windows (34a, 36a, 38a). Slits (34b, 36b, 38b) extend outward through the respective sheets from the windows. Connection terminals (34c, 34d; 36c, 36d; 38c, 38d) are provided on the sheets at locations facing across the respective slits. The metallic coil sheets are stacked, and adjacent ones of the stacked metallic coil sheets are electrically connected by means of the connection terminals. A core (60, 62) is disposed in the windows of the stacked metallic coil sheets. The metallic coil sheets are individually covered with an insulating coating.
    Type: Application
    Filed: May 27, 2003
    Publication date: December 4, 2003
    Inventors: Toshikazu Fujiyoshi, Masao Katooka, Tetsuro Ikeda, Kenji Morimoto, Hideo Ishii
  • Patent number: 6636140
    Abstract: A high-frequency large current handling transformer includes a stack of plural metal planar coil members with a window formed in a center portion of each of the planar coil member. A slit extends outward from the window in each planar coil member. First and second terminals are provided for each planar coil member at locations on opposite sides of the slit. An insulating sheet having a window formed in its center portion is disposed between adjacent ones of the planar coil members. Some of the planar coil members are connected in series to provide a higher-voltage side coil, and the remaining planar coil members are connected in parallel to provide a lower-voltage side coil. An 8-shaped high-frequency core is operatively combined with the coils.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: October 21, 2003
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Toshikazu Fujiyoshi, Masao Katooka, Tetsuro Ikeda, Kenji Morimoto, Hideo Ishii
  • Patent number: 6507004
    Abstract: A DC power supply apparatus has two power supply input terminals between which one of 100 V level, 200 V level and 400 V level AC power supply voltages or a 575 V AC power supply voltage is applied. A rectifying unit is connected between the two power supply input terminals, and a voltage-lowering converter is connected to the rectifying unit. A thyristor is connected between the input and output of the voltage-lowering converter. A series combination of two capacitors is connected between two output terminals of the voltage-lowering converter. A switch circuit is connected between the junction of the two capacitors and one input terminal of the rectifying unit. An inverter converts a DC voltage appearing across the series combination of the capacitors into a high-frequency voltage, which, in turn, is voltage transformed by a transformer. The voltage-transformed high-frequency voltage is converted into a DC voltage in a high-frequency-to-DC converter for application to a load.
    Type: Grant
    Filed: November 20, 2001
    Date of Patent: January 14, 2003
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Tetsuro Ikeda, Toru Arai, Hideo Ishii
  • Patent number: 6498320
    Abstract: One of commercial AC voltages is coupled to power supply terminals from one of commercial AC power supplies. The AC power supplies belong to either a first group providing higher voltages or a second group providing lower voltages. A rectifier rectifies the AC voltage applied to the power supply terminals, and a rectified voltage is developed between two rectifier output terminals. A switching unit operates to connect voltage-boosting converters selectively in series and in parallel between the rectifier output terminals. Inverters are connected in the output sides of and in association with the respective voltage-boosting converters for converting DC voltages from the associated voltage-boosting converters to high-frequency voltages. The high-frequency voltages are voltage-transformed by associated voltage-transformers, and the voltage-transformed high-frequency voltages are converted into a DC voltage by a rectifier circuit and a reactor.
    Type: Grant
    Filed: November 15, 2001
    Date of Patent: December 24, 2002
    Assignee: Sansha Electric Manufacturing Company, Limite
    Inventors: Haruo Moriguchi, Tetsuro Ikeda, Hideo Ishii
  • Patent number: 6469921
    Abstract: A DC voltage from a DC supply is applied to inverters of two power supply units connected in parallel with each other. The inverters convert the received DC voltages into high-frequency voltages, which are, in turn, voltage-transformed in transformers. The outputs of the transformers are rectified in two rectifiers, respectively, and smoothed in two reactors. The smoothed voltages are supplied between output terminals. The reactors are formed on a single core, being loosely coupled with each other.
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: October 22, 2002
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Toru Arai, Tetsuro Ikeda, Goro Nakano, Hideo Ishii
  • Publication number: 20020070836
    Abstract: A high-frequency large current handling transformer includes a stack of plural metal planar coil members with a window formed in a center portion of each of the planar coil member. A slit extends outward from the window in each planar coil member. First and second terminals are provided for each planar coil member at locations on opposite sides of the slit. An insulating sheet having a window formed in its center portion is disposed between adjacent ones of the planar coil members. Some of the planar coil members are connected in series to provide a higher-voltage side coil, and the remaining planar coil members are connected in parallel to provide a lower-voltage side coil. An 8-shaped high-frequency core is operatively combined with the coils.
    Type: Application
    Filed: December 6, 2001
    Publication date: June 13, 2002
    Inventors: Toshikazu Fujiyoshi, Masao Katooka, Tetsuro Ikeda, Kenji Morimoto, Hideo Ishii
  • Publication number: 20020063116
    Abstract: A DC power supply apparatus has two power supply input terminals between which one of 100 V level, 200 V level and 400 V level AC power supply voltages or a 575 V AC power supply voltage is applied. A rectifying unit is connected between the two power supply input terminals, and a voltage-lowering converter is connected to the rectifying unit. A thyristor is connected between the input and output of the voltage-lowering converter. A series combination of two capacitors is connected between two output terminals of the voltage-lowering converter. A switch circuit is connected between the junction of the two capacitors and one input terminal of the rectifying unit. An inverter converts a DC voltage appearing across the series combination of the capacitors into a high-frequency voltage, which, in turn, is voltage transformed by a transformer. The voltage-transformed high-frequency voltage is converted into a DC voltage in a high-frequency-to-DC converter for application to a load.
    Type: Application
    Filed: November 20, 2001
    Publication date: May 30, 2002
    Inventors: Tetsuro Ikeda, Toru Arai, Hideo Ishii
  • Publication number: 20020056708
    Abstract: One of commercial AC voltages is coupled to power supply terminals from one of commercial AC power supplies. The AC power supplies belong to either a first group providing higher voltages or a second group providing lower voltages. A rectifier rectifies the AC voltage applied to the power supply terminals, and a rectified voltage is developed between two rectifier output terminals. A switching unit operates to connect voltage-boosting converters selectively in series and in parallel between the rectifier output terminals. Inverters are connected in the output sides of and in association with the respective voltage-boosting converters for converting DC voltages from the associated voltage-boosting converters to high-frequency voltages. The high-frequency voltages are voltage-transformed by associated voltage-transformers, and the voltage-transformed high-frequency voltages are converted into a DC voltage by a rectifier circuit and a reactor.
    Type: Application
    Filed: November 15, 2001
    Publication date: May 16, 2002
    Inventors: Haruo Moriguchi, Tetsuro Ikeda, Hideo Ishii
  • Publication number: 20010024377
    Abstract: A DC voltage from a DC supply is applied to inverters of two power supply units connected in parallel with each other. The inverters convert the received DC voltages into high-frequency voltages, which are, in turn, voltage-transformed in transformers. The outputs of the transformers are rectified in two rectifiers, respectively, and smoothed in two reactors. The smoothed voltages are supplied between output terminals. The reactors are formed on a single core, being loosely coupled with each other.
    Type: Application
    Filed: March 21, 2001
    Publication date: September 27, 2001
    Inventors: Toru Arai, Tetsuro Ikeda, Goro Nakano, Hideo Ishii
  • Patent number: 6278080
    Abstract: A power supply apparatus includes a power supply unit disposed within a casing. The power supply unit includes power semiconductor devices. A fan is provided in the casing for cooling the power semiconductor devices. The power supply unit is operated in a plurality of contiguous cycles each including a running and pausing modes of operation. Each cycle lasting a relatively short time period. The power supply unit operates in the running mode and the pausing mode, respectively in response to the closing and opening of a start switch. In association with the closing and opening of the start switch, a switch for the cooling fan causes the fan to rotate and stop, respectively, which results in minimizing the difference between the highest and lowest temperatures of the power semiconductor devices so that the lifetime of the power semiconductor devices can be prolonged.
    Type: Grant
    Filed: November 18, 1999
    Date of Patent: August 21, 2001
    Assignee: Sansha Electric Manufacturing Company Limited
    Inventors: Haruo Moriguchi, Tetsuro Ikeda, Atsushi Kinoshita, Hideo Ishii
  • Patent number: 6269015
    Abstract: An input-side rectifier rectifies a commercial AC voltage from a commercial AC power supply connected to an input terminal and develops a rectified voltage between two output terminals. The rectified voltage is smoothed by a pair of capacitors. A switching arrangement connects the capacitors selectively in series and in parallel between the two output terminals. An inverter is associated with each of the capacitors. A high-frequency voltage from each of the inverters is voltage-transformed by a transformer. The high-frequency voltage from the transformer is converted into a DC voltage by a high-frequency-to DC converter for application to a load. When an AC voltage in a lower voltage group is applied to the input terminal, a switching control unit causes the switching arrangement to connect the capacitors in parallel, and when an AC voltage in a higher voltage group is applied to the input terminal, the switching arrangement is caused to connect the capacitors in series.
    Type: Grant
    Filed: November 8, 2000
    Date of Patent: July 31, 2001
    Assignee: Sansha Electric Manufacturing Company, Limited
    Inventors: Tetsuro Ikeda, Masayuki Ono, Takeshi Morimoto
  • Patent number: 6194681
    Abstract: A DC voltage resulting from rectifying and smoothing a commercial AC voltage is converted into a high-frequency voltage in an inverter which is operated in response to the closure of a start switch. A transformer transforms the high-frequency voltage, and the voltage-transformed high-frequency voltage is converted to a DC voltage by a rectifier and reactor for application between a torch and a workpiece with a gap disposed therebetween. In response to the closure of the start switch, an igniter operated from the voltage-transformed high-frequency voltage is enabled by an igniter driver to thereby apply a high-frequency voltage between the torch and the workpiece to generate an arc therebetween. A current detector detects current attributable to the arcing. A timer starts operating upon closure of the start switch and causes a disabling commander to disable the inverter when no current is detected by the current detector during a time period longer than a period required for an arc to be generated in the gap.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: February 27, 2001
    Assignee: Sansha Electric Manufacturing Company Limited
    Inventors: Haruo Moriguchi, Tetsuro Ikeda, Kenzo Danjou, Atsushi Kinoshita