Patents by Inventor Kinya Nakatsu
Kinya Nakatsu 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).
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Patent number: 6960980Abstract: A power converter includes a shunt resistor constituted by a shunt resistance and a plurality of main electrodes made of a sheet-like resistive material. In the shunt resistor, plates lower in volume electric resistivity than the resistive material, higher in thermal conductivity than the resistive material and thicker in thickness than the resistive material are fixedly attached by solder, to the side surfaces of the main electrodes opposite to the side surfaces with which the main electrodes are fixedly attached to an insulating layer. At least one plate main electrode for electrically connecting with main circuit wiring is provided in each of the plates. At least one constricted portion is formed between each of the plate main electrodes and the shunt resistance. Plate detection electrodes for detecting a voltage between the opposite ends of the shunt resistance is provided on the plates near the shunt resistance portion.Type: GrantFiled: March 19, 2002Date of Patent: November 1, 2005Assignee: Hitachi, Ltd.Inventors: Kinya Nakatsu, Masataka Sasaki, Ryuichi Saito, Satoshi Ibori, Masato Takase
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Patent number: 6951207Abstract: A fuel supply apparatus reduces the fuel vaporization and leakage by means that the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus heats and cools the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus adjusts the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.Type: GrantFiled: April 7, 2004Date of Patent: October 4, 2005Assignee: Hitachi, Ltd.Inventors: Shiro Yamaoka, Minoru Oosuga, Kinya Nakatsu
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Patent number: 6927665Abstract: A low noise, compact and low cost electric power converter employing a compact common mode transformer, and incorporating a line filter can reduce a leakage current, and can maintain predetermined leakage current reduction effect even if installation condition of the electric power converter or a characteristics of a semiconductor switching element is varied. The electric power converter including a capacitor, a first electrode, a second electrode, a first magnetic body, on which the first electrode and the second electrode are wound to form an LC composite element, connecting electrodes electrically connected to respective of both ends of the first and second electrodes, a second magnetic body for interlinking both ends of the first magnetic body, a coil wound around the second magnetic body in the same winding direction as the first and second electrodes wound around the first magnetic body and a resistor for shorting the output of the coil.Type: GrantFiled: October 20, 2004Date of Patent: August 9, 2005Assignees: Hitachi, Ltd., Hitachi Industrial Equuipment Systems Co., Ltd.Inventors: Kinya Nakatsu, Satoshi Ibori, Masayuki Hirota, Tooru Nakajima
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Publication number: 20050161809Abstract: To provide a power converter equipped with a current detector which is small and can carry out highly accurate current detection, in the power converter equipped with a power module 16 having a power controlling semiconductor element 7 disposed on the power module base 27 with a ceramic substrate 28 interposed, and a control unit 26 for controlling the operation of the power controlling semiconductor element 7, a current detector 40 having a magnetic detecting unit 47 which is disposed in the detection conductor 11, electrically connected to the power controlling semiconductor element 7 and disposed on the power module base 27 with the ceramic substrate 28 interposed, and has a magnetic detecting semiconductor element 43 electrically connected to the control unit 26 is provided in the power module 16; and relative distance between the detection conductor 11 and the power module base 27 is larger than the relative distance between the current detection electrode 42 and the power module base 27.Type: ApplicationFiled: April 4, 2003Publication date: July 28, 2005Inventors: Kinya Nakatsu, Koichi Yahata, Masato Takahashi, Mitsufumi Iwanaka, Ryuichi Saito, Haruki Hamada
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Patent number: 6918370Abstract: A fuel supply apparatus reduces the fuel vaporization and leakage by means that the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus is provided for heating or cooling the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus is provided for adjusting the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.Type: GrantFiled: March 31, 2003Date of Patent: July 19, 2005Assignee: Hitachi, Ltd.Inventors: Shiro Yamaoka, Minoru Oosuga, Kinya Nakatsu
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Patent number: 6910468Abstract: A fuel supply apparatus reduces fuel vaporization and leakage the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus heat or cools the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus adjusts the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.Type: GrantFiled: April 7, 2004Date of Patent: June 28, 2005Assignee: Hitachi, Ltd.Inventors: Shiro Yamaoka, Minoru Oosuga, Kinya Nakatsu
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Publication number: 20050135065Abstract: An electric circuit module comprising: an electric device comprising an electric circuit to serve for passage and interruption of electric current, a packing material packing the electric circuit and a plurality of wiring members to electrically connect the electric circuit with an external circuit; and a heat sink to radiate heat from the electric device. The electric circuit module includes a fixture to fix the heat sink and the electric device together so that a heat radiating surface of the electric device comes into contact with the heat sink. The fixture is formed with a recess to accommodate therein a part of the electric device so that the heat radiating surface of the electric device is exposed from the fixture. When the electric device is fixed to the heat sink by the fixture, the heat radiating surface comes into contact with the heat sink.Type: ApplicationFiled: December 15, 2004Publication date: June 23, 2005Inventors: Kinya Nakatsu, Naoki Takata, Masayuki Hirota, Satoshi Ibori, Tomoya Kamezawa
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Patent number: 6873240Abstract: A low noise, compact and low cost electric power converter employing a compact common mode transformer, and incorporating a line filter can reduce a leakage current, and can maintain predetermined leakage current reduction effect even if installation condition of the electric power converter or a characteristics of a semiconductor switching element is varied. The electric power converter including a capacitor, a first electrode, a second electrode, a first magnetic body, on which the first electrode and the second electrode are wound to form an LC composite element, connecting electrodes electrically connected to respective of both ends of the first and second electrodes, a second magnetic body for interlinking both ends of the first magnetic body, a coil wound around the second magnetic body in the same winding direction as the first and second electrodes wound around the first magnetic body and a resistor for shorting the output of the coil.Type: GrantFiled: August 20, 2002Date of Patent: March 29, 2005Assignees: Hitachi, Ltd., Hitachi Industrial Equipment Systems Co., Ltd.Inventors: Kinya Nakatsu, Satoshi Ibori, Masayuki Hirota, Tooru Nakajima
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Publication number: 20050052271Abstract: A low noise, compact and low cost electric power converter employing a compact common mode transformer, and incorporating a line filter can reduce a leakage current, and can maintain predetermined leakage current reduction effect even if installation condition of the electric power converter or a characteristics of a semiconductor switching element is varied. The electric power converter including a capacitor, a first electrode, a second electrode, a first magnetic body, on which the first electrode and the second electrode are wound to form an LC composite element, connecting electrodes electrically connected to respective of both ends of the first and second electrodes, a second magnetic body for interlinking both ends of the first magnetic body, a coil wound around the second magnetic body in the same winding direction as the first and second electrodes wound around the first magnetic body and a resistor for shorting the output of the coil.Type: ApplicationFiled: October 20, 2004Publication date: March 10, 2005Applicant: HITACH LTD.Inventors: Kinya Nakatsu, Satoshi Ibori, Masayuki Hirota, Tooru Nakajima
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Patent number: 6844700Abstract: An inverter apparatus for converting a DC power converted from an input AC power to an output AC power of a variable frequency and a variable electric power to drive an induction motor at a variable speed. The inverter apparatus includes a rectifying unit, a filter capacitor, an inverter unit having an input connected across the filter capacitor, an input current detector and a gate circuitry for driving the inverter unit. An excitation current detection unit detects an excitation current of the induction motor from an output signal of the input current detector, a gate signal for driving the gate circuitry and a reference phase command. A setting unit sets a limitation level of the excitation current, a torque boost voltage command unit produces a torque boost voltage command, and a torque boost voltage compensation unit changes the torque boost voltage command so that the detected excitation current value is smaller than or equal to the limitation level.Type: GrantFiled: July 8, 2003Date of Patent: January 18, 2005Assignee: Hitachi, Ltd.Inventors: Keijiro Sakai, Toshiaki Okuyama, Kinya Nakatsu, Hiroyuki Tomita, Junji Kato, Teiichi Furukawa
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Publication number: 20040187800Abstract: A fuel supply apparatus reduces the fuel vaporization and leakage by means that the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus is provided for heating or cooling the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus is provided for adjusting the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.Type: ApplicationFiled: April 7, 2004Publication date: September 30, 2004Applicant: Hitachi, Ltd.Inventors: Shiro Yamaoka, Minoru Oosuga, Kinya Nakatsu
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Publication number: 20040187801Abstract: A fuel supply apparatus reduces the fuel vaporization and leakage by means that the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus is provided for heating or cooling the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus is provided for adjusting the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.Type: ApplicationFiled: April 7, 2004Publication date: September 30, 2004Applicant: Hitachi, Ltd.Inventors: Shiro Yamaoka, Minoru Oosuga, Kinya Nakatsu
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Publication number: 20040187799Abstract: A fuel supply apparatus reduces the fuel vaporization and leakage by means that the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus is provided for heating or cooling the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus is provided for adjusting the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.Type: ApplicationFiled: April 7, 2004Publication date: September 30, 2004Applicant: Hitachi, Ltd.Inventors: Shiro Yamaoka, Minoru Oosuga, Kinya Nakatsu
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Patent number: 6794854Abstract: A power converter includes a shunt resistor constituted by a shunt resistance and a plurality of main electrodes made of a sheet-like resistive material. In the shunt resistor, plates lower in volume electric resistivity than the resistive material, higher in thermal conductivity than the resistive material and thicker in thickness than the resistive material are fixedly attached by solder, to the side surfaces of the main electrodes opposite to the side surfaces with which the main electrodes are fixedly attached to an insulating layer. At least one plate main electrode for electrically connecting with main circuit wiring is provided in each of the plates. At least one constricted portion is formed between each of the plate main electrodes and the shunt resistance. Plate detection electrodes for detecting a voltage between the opposite ends of the shunt resistance is provided on the plates near the shunt resistance portion.Type: GrantFiled: November 7, 2002Date of Patent: September 21, 2004Assignee: Hitachi, Ltd.Inventors: Kinya Nakatsu, Masataka Sasaki, Ryuichi Saito, Satoshi Ibori, Masato Takase
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Patent number: 6741063Abstract: Induction voltage command Em* is obtained from inverter's primary frequency command &ohgr;1* and torque boost voltage commander produces torque boost voltage command &Dgr;Vz* in accordance with &ohgr;1* while integrator produces reference phase command &thgr;d*. uvw/dq converter detects motor excitation current Id (equivalent of no-load current). Next, deviation of excitation current limitation level command Idmax* and detected Id is inputted to limiter processing unit to produce torque boost voltage compensation value &Dgr;Vc for varying &Dgr;Vz* so that Id is smaller than or equal to Idmax*. Inverted &Dgr;Vz* is set up as a lower limiter value of the limiter processing unit. Next, &Dgr;Vc and &Dgr;Vz* are added to produce final compensated torque boost voltage command &Dgr;Vt* and &Dgr;Vt* and Em* are added to produce q-axis voltage command Vq* of the inverter output voltage.Type: GrantFiled: March 19, 2002Date of Patent: May 25, 2004Assignee: Hitachi, Ltd.Inventors: Keijiro Sakai, Toshiaki Okuyama, Kinya Nakatsu, Hiroyuki Tomita, Junji Kato, Teiichi Furukawa
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Publication number: 20040008005Abstract: An inverter apparatus for converting a DC power converted from an input AC power to an output AC power of a variable frequency and a variable electric power to drive an induction motor at a variable speed. The inverter apparatus includes a rectifying unit, a filter capacitor, an inverter unit having an input connected across the filter capacitor, an input current detector and a gate circuitry for driving the inverter unit. An excitation current detection unit detects an excitation current of the induction motor from an output signal of the input current detector, a gate signal for driving the gate circuitry and a reference phase command. A setting unit sets a limitation level of the excitation current, a torque boost voltage command unit produces a torque boost voltage command, and a torque boost voltage compensation unit changes the torque boost voltage command so that the detected excitation current value is smaller than or equal to the limitation level.Type: ApplicationFiled: July 8, 2003Publication date: January 15, 2004Inventors: Keijiro Sakai, Toshiaki Okuyama, Kinya Nakatsu, Hiroyuki Tomita, Junji Kato, Teiichi Furukawa
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Publication number: 20030230249Abstract: A fuel supply apparatus reduces the fuel vaporization and leakage by means that the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus is provided for heating or cooling the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus is provided for adjusting the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.Type: ApplicationFiled: March 10, 2003Publication date: December 18, 2003Applicant: HITACHI, LTD.Inventors: Shiro Yamaoka, Minoru Oosuga, Kinya Nakatsu
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Publication number: 20030230289Abstract: A fuel supply apparatus reduces the fuel vaporization and leakage by means that the positions of vaporization and leakage and their amount in the fuel tank and the fuel pipe is detected properly in case of using a low boiling point fuel having a vapor phase in the normal temperatures and atmospheric pressures, and the fuel state is controlled based on those detected values. By providing another container made of elastomatic material having an expandable mechanical characteristic inside the fuel storing container, the low boiling point fuel is stored in the separate container. A flow rate controlling apparatus is provided for heating or cooling the fuel pipe leading the low boiling point fuel stored in the fuel storing container to the engine. A flow rate controlling apparatus is provided for adjusting the flow rate of the fuel in the fuel pipe for leading the low boiling point fuel stored in the fuel storing container to the engine.Type: ApplicationFiled: March 31, 2003Publication date: December 18, 2003Applicant: HITACHI, LTD.Inventors: Shiro Yamaoka, Minoru Oosuga, Kinya Nakatsu
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Publication number: 20030090241Abstract: A power converter includes a shunt resistor constituted by a shunt resistance and a plurality of main electrodes made of a sheet-like resistive material. In the shunt resistor, plates lower in volume electric resistivity than the resistive material, higher in thermal conductivity than the resistive material and thicker in thickness than the resistive material are fixedly attached by solder, to the side surfaces of the main electrodes opposite to the side surfaces with which the main electrodes are fixedly attached to an insulating layer. At least one plate main electrode for electrically connecting with main circuit wiring is provided in each of the plates. At least one constricted portion is formed between each of the plate main electrodes and the shunt resistance. Plate detection electrodes for detecting a voltage between the opposite ends of the shunt resistance is provided on the plates near the shunt resistance portion.Type: ApplicationFiled: November 7, 2002Publication date: May 15, 2003Applicant: Hitachi, Ltd.Inventors: Kinya Nakatsu, Masataka Sasaki, Ryuichi Saito, Satoshi Ibori, Masato Takase
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Patent number: 6556464Abstract: A single-phase PWM converter system in accordance with the present invention employs a sample-and-hold circuit which samples and holds a direct current in the state wherein one of two-phase gate signals of a positive or negative side arm is ON and the other phase is OFF, determines the sign of an output of the sample-and-hold circuit according to the two-phase gate condition, detects a phase current at the input side of the converter, and controls a voltage at the input side of the converter so that the detected current value agrees with a power supply current command. Further, a three-phase PWM converter system in accordance with the present invention detects the effective current and the ineffective current of the power supply current from the direct current, and based on the values, controls the PWM converter so that the sine wave power supply current whose power supply power factor is 1 is provided.Type: GrantFiled: September 20, 2001Date of Patent: April 29, 2003Assignee: Hitachi, Ltd.Inventors: Keijirou Sakai, Toshiaki Okuyama, Kinya Nakatsu, Seiji Ishida, Hiroshi Fujii, Junji Kato, Masahiro Hiraga