Patents by Inventor Junpei Uruno
Junpei Uruno 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: 8614568Abstract: A power converting apparatus having a gate drive circuit including a push-pull circuit consisting of two transistors at its output stage; a diode connected in series with the push-pull circuit; a gate power source connected in parallel with the series circuit of the push-pull circuit and the diode; a negative voltage generating circuit connected in parallel with the push-pull circuit; a transistor connected between the output terminal of the negative voltage generating circuit and the negative terminal of the gate power source, wherein the output voltage of the push-pull circuit is switched from positive polarity to negative polarity and vice versa depending on the signal applied to the base terminals of the transistors.Type: GrantFiled: February 16, 2011Date of Patent: December 24, 2013Assignee: Hitachi, Ltd.Inventors: Junpei Uruno, Hiroyuki Shoji, Masayuki Isogai
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Patent number: 8207717Abstract: A unidirectional DC-DC converter and method of control thereof. The converter includes a DC power-supply, a buck converter circuit having a first main switching element, a boost converter circuit having a second main switching element, a first snubber capacitor, a first inversely-parallel diode, a control device, and an output diode.Type: GrantFiled: September 23, 2010Date of Patent: June 26, 2012Assignee: Hitachi, Ltd.Inventors: Junpei Uruno, Hiroyuki Shoji, Yasuo Kaminaga, Akihiko Kanouda
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Patent number: 8203322Abstract: A small and efficient DC-DC converter is provided. In this DC-DC converter, passive elements such as an inductor and a capacitor can be reduced in size by reducing switching loss by a soft switching technology and increasing the drive frequency of a switching element. The DC-DC converter has a main switching element, a main diode and an auxiliary circuit that discharges the electric charges of the capacitance between the ends of the main switching element. The DC-DC converter includes an auxiliary inductor magnetically coupled with the main inductor, an auxiliary switching element that stores energy in the auxiliary inductor, and an auxiliary diode that discharges energy stored in the auxiliary inductor to the direct-current power source or the output side. The auxiliary inductor is coupled with the main inductor in the direction in which backward voltage is applied to the auxiliary diode when the main inductor discharges energy.Type: GrantFiled: August 19, 2009Date of Patent: June 19, 2012Assignee: Hitachi, Ltd.Inventors: Toshikazu Okubo, Takae Shimada, Hiroyuki Shoji, Junpei Uruno
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Publication number: 20110228564Abstract: A power converting apparatus having a gate drive circuit including a push-pull circuit consisting of two transistors at its output stage; a diode connected in series with the push-pull circuit; a gate power source connected in parallel with the series circuit of the push-pull circuit and the diode; a negative voltage generating circuit connected in parallel with the push-pull circuit; a transistor connected between the output terminal of the negative voltage generating circuit and the negative terminal of the gate power source, wherein the output voltage of the push-pull circuit is switched from positive polarity to negative polarity and vice versa depending on the signal applied to the base terminals of the transistors.Type: ApplicationFiled: February 16, 2011Publication date: September 22, 2011Inventors: Junpei URUNO, Hiroyuki Shoji, Masayuki Isogai
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Publication number: 20110013437Abstract: A unidirectional DC-DC converter and method of control thereof. The converter includes a DC power-supply, a buck converter circuit having a first main switching element, a boost converter circuit having a second main switching element, a first snubber capacitor, a first inversely-parallel diode, a control device, and an output diode.Type: ApplicationFiled: September 23, 2010Publication date: January 20, 2011Inventors: Junpei URUNO, Hiroyuki Shoji, Yasuo Kaminaga, Akihiko Kanouda
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Publication number: 20100061122Abstract: A small and efficient DC-DC converter is provided. In this DC-DC converter, passive elements such as an inductor and a capacitor can be reduced in size by reducing switching loss by a soft switching technology and increasing the drive frequency of a switching element. The DC-DC converter has a main switching element, a main diode and an auxiliary circuit that discharges the electric charges of the capacitance between the ends of the main switching element. The DC-DC converter includes an auxiliary inductor magnetically coupled with the main inductor, an auxiliary switching element that stores energy in the auxiliary inductor, and an auxiliary diode that discharges energy stored in the auxiliary inductor to the direct-current power source or the output side. The auxiliary inductor is coupled with the main inductor in the direction in which backward voltage is applied to the auxiliary diode when the main inductor discharges energy.Type: ApplicationFiled: August 19, 2009Publication date: March 11, 2010Inventors: Toshikazu OKUBO, Takae Shimada, Hiroyuki Shoji, Junpei Uruno
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Patent number: 7557546Abstract: A unidirectional DC-DC converter which has a simple control circuit without using multiple insulated power supplies or a transformer, uses an auxiliary inductor of a comparatively small capacitance, reduces the size and weight of the converter, and has a very great capacitance without switching of supply current. For example, a unidirectional DC-DC converter equipped with main IGBT101 which supplies and shuts off current for first inductor 108a and diode 107 which discharges energy from main inductor 108a to an the output. The DC-DC converter is further equipped with auxiliary IGBT104 which applies current to back-to-back-connected diode 102 by using energy stored in auxiliary inductor 108b which is magnetically coupled with main inductor 108a. This applies current to the back-to-back-connected diode in a short period including a time period in which the first switching element is turned on and accomplishes ZVZCS.Type: GrantFiled: January 26, 2007Date of Patent: July 7, 2009Assignees: Hitachi, Ltd., Hitachi Appliances, Inc.Inventors: Junpei Uruno, Hiroyuki Shoji, Akihiko Kanouda, Yasuo Kaminaga
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Patent number: 7551462Abstract: A soft switching DC-DC converter is provided which includes circuitry for both a buck converter and a boost converter. The buck converter circuitry and the boost converter circuitry share a common transformer including a primary coil and first and second secondary coils. A first switching element is coupled to a first capacitor to provide the buck converter operation while another switching element is provided to provide the boost converting operation. The primary coil of the transformer is commonly used as a choke coil by both the buck converter and the boost converter. In this way, size and cost reduction can be obtained.Type: GrantFiled: February 7, 2006Date of Patent: June 23, 2009Assignee: Hitachi, Ltd.Inventors: Junpei Uruno, Hiroyuki Shoji, Akihiko Kanouda, Yasuo Kaminaga
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Publication number: 20080100273Abstract: A buck converter circuit and a boost converter circuit, which co-use a main inductor, are connected in series with each other between a DC power-supply and a DC load between output terminals a-b of a rectifier circuit. Moreover, utilizing energy accumulated into first and second auxiliary inductors which are loosely coupled to the main inductor magnetically, a current is flown through diodes during a short time-period including a point-in-time at which main switching elements of the buck and boost converter circuits are to be turned ON. Here, the diodes are connected in inversely parallel to the main switching elements.Type: ApplicationFiled: October 23, 2007Publication date: May 1, 2008Inventors: Junpei Uruno, Hiroyuki Shoji, Yasuo Kaminaga, Akihiko Kanouda
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Publication number: 20070236966Abstract: A unidirectional DC-DC converter which has a simple control circuit without using multiple insulated power supplies, uses an auxiliary inductor of a comparatively small capacitance, reduces the size and weight of the converter, and has a very great capacitance without switching of supply current. A unidirectional DC-DC converter equipped with main IGBT101 which supplies and shuts off current for first inductor 108a and diode 107 which discharges energy from main inductor 108a to an output, wherein the DC-DC converter is further equipped with auxiliary IGBT104 which applies current to back-to-back-connected diode 102 by using energy stored in auxiliary inductor 108b which is magnetically coupled with main inductor 108a. This applies current to the back-to-back-connected diode in a short period including a time period in which the first switching element is turned on and accomplishes ZVZCS.Type: ApplicationFiled: January 26, 2007Publication date: October 11, 2007Inventors: Junpei Uruno, Hiroyuki Shoji, Akihiko Kanouda, Yasuo Kaminaga
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Publication number: 20060176719Abstract: The present invention relates to a soft switching DC-DC converter. A soft switching DC-DC converter comprises a first switching element having a first terminal connected to an input side and having a control terminal for controlling a main electric current; a first diode having a first terminal connected to a second terminal of this first switching element; a primary coil of a transformer having primary and secondary coils, connected to the second terminal of the first switching element; a second diode having a first terminal connected to the first terminal of the first switching element; a second switching element having a first terminal connected to the second terminal of this second diode; and the secondary coil of the transformer, having a first terminal connected to a second terminal of this second switching element, and having a second terminal connected to the second terminal of the first switching element.Type: ApplicationFiled: February 7, 2006Publication date: August 10, 2006Inventors: Junpei Uruno, Hiroyuki Shoji, Akihiko Kanouda, Yasuo Kaminaga
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Patent number: 7051724Abstract: An igniter of the present invention has an insulated gate semiconductor device having a collector terminal, an emitter terminal and a gate terminal, a current control circuit which limits current by controlling voltage at the gate terminal when current for flowing through the insulated gate semiconductor device exceeds a fixed value, a voltage monitor circuit for detecting a potential of the collector, and a control current adjusting circuit for controlling current which flows through the gate terminal by receiving output from the voltage monitor circuit.Type: GrantFiled: December 13, 2002Date of Patent: May 30, 2006Assignee: Hitachi, Ltd.Inventors: Junpei Uruno, Yasuhiko Kouno
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Publication number: 20040216724Abstract: An igniter of the present invention has an insulated gate semiconductor device having a collector terminal, an emitter terminal and a gate terminal, a current control circuit which limits current by controlling voltage at the gate terminal when current for flowing through the insulated gate semiconductor device exceeds a fixed value, a voltage monitor circuit for detecting a potential of the collector, and a control current adjusting circuit for controlling current which flows through the gate terminal by receiving output from the voltage monitor circuit.Type: ApplicationFiled: December 22, 2003Publication date: November 4, 2004Inventors: Junpei Uruno, Yasuhiko Kouno
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Patent number: 6672295Abstract: A circuit for supplying an oscillation suppress current is provided between a collector terminal and gate electrode of a main IGBT. The current supply circuit comprises a resistor and a diode which are connected in series. A bypass MOSFET is connected between the series connection and the emitter terminal. No semiconductor element having different temperature characteristics is provided in the current supply circuit.Type: GrantFiled: February 11, 2003Date of Patent: January 6, 2004Assignee: Hitachi, Ltd.Inventors: Yasuhiko Kohno, Junpei Uruno, Mutsuhiro Mori
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Publication number: 20030116149Abstract: A circuit for supplying an oscillation suppress current is provided between a collector terminal and gate electrode of a main IGBT. The current supply circuit comprises a resistor and a diode which are connected in series. A bypass MOSFET is connected between the series connection and the emitter terminal. No semiconductor element having different temperature characteristics is provided in the current supply circuit.Type: ApplicationFiled: February 11, 2003Publication date: June 26, 2003Inventors: Yasuhiko Kohno, Junpei Uruno, Mutsuhiro Mori
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Patent number: 6539928Abstract: A circuit for supplying an oscillation suppress current is provided between a collector terminal and gate electrode of a main IGBT. The current supply circuit comprises a resistor and a diode which are connected in series. A bypass MOSFET is connected between the series connection and the emitter terminal. No semiconductor element having different temperature characteristics is provided in the current supply circuit.Type: GrantFiled: February 23, 2001Date of Patent: April 1, 2003Assignee: Hitachi, Ltd.Inventors: Yasuhiko Kohno, Junpei Uruno, Mutsuhiro Mori
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Patent number: 6448587Abstract: A circuit incorporated IGBT is provided with a semiconductor substrate having an IGBT area and a circuit area which are adjacent to each other. In a semiconductor layer of one conductivity type in which a circuit element is formed in the circuit area, there is provided another semiconductor layer of another conductivity type which adjoins the circuit element and has an impurity concentration higher than that of the semiconductor layer of the one conductivity type. An electrode contacts the other semiconductor layer and is connected to an electrode of the IGBT. Carriers are ejected from the other semiconductor layer to the electrode of the IGBT, thereby making it possible to prevent an erroneous operation of the circuit.Type: GrantFiled: November 7, 2001Date of Patent: September 10, 2002Assignee: Hitachi, Ltd.Inventors: Yasuhiko Kohno, Mutsuhiro Mori, Junpei Uruno
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Publication number: 20020040709Abstract: A circuit for supplying an oscillation suppress current is provided between a collector terminal and gate electrode of a main IGBT. The current supply circuit comprises a resistor and a diode which are connected in series. A bypass MOSFET is connected between the series connection and the emitter terminal. No semiconductor element having different temperature characteristics is provided in the current supply circuit.Type: ApplicationFiled: February 23, 2001Publication date: April 11, 2002Inventors: Yasuhiko Kohno, Junpei Uruno, Mutsuhiro Mori
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Publication number: 20020027253Abstract: A circuit incorporated IGBT is provided with a semiconductor substrate having an IGBT area and a circuit area which are adjacent to each other. In a semiconductor layer of one conductivity type in which a circuit element is formed in the circuit area, there is provided another semiconductor layer of another conductivity type which adjoins the circuit element and has an impurity concentration higher than that of the semiconductor layer of the one conductivity type. An electrode contacts the other semiconductor layer and is connected to an electrode of the IGBT. Carriers are ejected from the other semiconductor layer to the electrode of the IGBT, thereby making it possible to prevent an erroneous operation of the circuit.Type: ApplicationFiled: November 7, 2001Publication date: March 7, 2002Inventors: Yasuhiko Kohno, Mutsuhiro Mori, Junpei Uruno