Patents by Inventor Koji Tateno
Koji Tateno 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: 8680830Abstract: Miniaturization of a multiphase type power supply device can be achieved. A power supply control unit in which, for example, a microcontroller unit, a memory unit and an analog controller unit are formed over a single chip, a plurality of PWM-equipped drive units, and a plurality of inductors configure a multiphase power supply. The microcontroller unit outputs clock signals each having a frequency and a phase defined based on a program on the memory unit to the respective PWM-equipped drive units. The analog controller unit detects a difference between a voltage value of a load and a target voltage value acquired via a serial interface and outputs an error amp signal therefrom. Each of the PWM-equipped drive units drives each inductor by a peak current control system using the clock signal and the error amp signal.Type: GrantFiled: September 12, 2011Date of Patent: March 25, 2014Assignee: Renesas Electronics CorporationInventors: Ryotaro Kudo, Tomoaki Uno, Koji Tateno, Hideo Ishii, Kazuyuki Umezu, Koji Saikusa
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Patent number: 8638078Abstract: A voltage clamping circuit which operates in a stable manner and a switching power source device which enables high-speed operation. In the switching power source device, one source/drain route is connected to an input terminal to which an input voltage is supplied, a predetermined voltage to be restricted is supplied to a gate, and using a MOSFET which provides a current source between another source/drain route and a ground potential of the circuit, a clamp output voltage which corresponds to the input voltage is obtained from another source/drain route. The switching power source device further includes a first switching element which controls a current in an inductor and a second switching element which clamps a reverse electromotive voltage generated in the inductor. The voltage clamping circuit is used in a feedback route for setting a dead time.Type: GrantFiled: August 23, 2012Date of Patent: January 28, 2014Assignee: Renesas Electronics CorporationInventors: Ryotaro Kudo, Koji Tateno
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Patent number: 8604764Abstract: In a switching power source which controls a current which flows in an inductor through a switching element which performs a switching operation in response to a PWM signal, and forms an output voltage by a capacitor which is provided in series in the inductor, a booster circuit which is constituted of a bootstrap capacity and a MOSFET is provided between an output node of the switching element and a predetermined voltage terminal. The boosted voltage is used as an operational voltage of a driving circuit of the switching element, another source/drain region and a substrate gate are connected with each other, and a junction diode between one source/drain region and the substrate gate is inversely directed with respect to the boosted voltage which is formed by the bootstrap capacity.Type: GrantFiled: September 13, 2012Date of Patent: December 10, 2013Assignee: Renesas Electronics CorporationInventors: Kyoichi Hosokawa, Ryotaro Kudo, Toshio Nagasawa, Koji Tateno
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Patent number: 8471541Abstract: In a switching power source which controls a current which flows in an inductor through a switching element which performs a switching operation in response to a PWM signal, and forms an output voltage by a capacitor which is provided in series in the inductor, a booster circuit which is constituted of a bootstrap capacity and a MOSFET is provided between an output node of the switching element and a predetermined voltage terminal. The boosted voltage is used as an operational voltage of a driving circuit of the switching element, another source/drain region and a substrate gate are connected with each other, and a junction diode between one source/drain region and the substrate gate is inversely directed with respect to the boosted voltage which is formed by the bootstrap capacity.Type: GrantFiled: May 11, 2012Date of Patent: June 25, 2013Assignee: Renesas Electronics CorporationInventors: Kyoichi Hosokawa, Ryotaro Kudo, Toshio Nagasawa, Koji Tateno
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Publication number: 20130076322Abstract: Disclosed is a power conversion circuit that suppresses the flow of a through current to a switching element based on a normally-on transistor. The power conversion circuit includes a high-side transistor and a low-side transistor, which are series-coupled to each other to form a half-bridge circuit, and two drive circuits, which complementarily drive the gate of the high-side transistor and of the low-side transistor. The high-side transistor is a normally-off transistor. The low-side transistor is a normally-on transistor.Type: ApplicationFiled: July 31, 2012Publication date: March 28, 2013Applicant: RENESAS ELECTRONICS CORPORATIONInventors: Koji TATENO, Takahiro NOMIYAMA, Yoshinao MIURA, Hideo ISHII
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Publication number: 20130049719Abstract: A voltage clamping circuit which operates in a stable manner and a switching power source device which enables high-speed operation. In the switching power source device, one source/drain route is connected to an input terminal to which an input voltage is supplied, a predetermined voltage to be restricted is supplied to a gate, and using a MOSFET which provides a current source between another source/drain route and a ground potential of the circuit, a clamp output voltage which corresponds to the input voltage is obtained from another source/drain route. The switching power source device further includes a first switching element which controls a current in an inductor and a second switching element which clamps a reverse electromotive voltage generated in the inductor. The voltage clamping circuit is used in a feedback route for setting a dead time.Type: ApplicationFiled: August 23, 2012Publication date: February 28, 2013Inventors: Ryotaro KUDO, Koji Tateno
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Patent number: 8373484Abstract: The present invention provides a voltage clamping circuit which is operated in a stable manner with the simple constitution and a switching power source device which enables a high-speed operation. In a switching power source device, one of source/drain routes is connected to an input terminal to which an input voltage is supplied, a predetermined voltage to be restricted is supplied to a gate, and using a MOSFET which provides a current source between another source/drain route and a ground potential of the circuit, a clamp output voltage which corresponds to the input voltage is obtained from another source/drain route. The switching power source device further includes a first switching element which controls a current which is made to flow in an inductor such that the output voltage assumes a predetermined voltage and a second switching element which clamps an reverse electromotive voltage generated in the inductor when the first switching element is turned off to a predetermined potential.Type: GrantFiled: February 2, 2011Date of Patent: February 12, 2013Assignee: Renesas Electronics CorporationInventors: Ryotaro Kudo, Koji Tateno
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Publication number: 20130002313Abstract: In a switching power source which controls a current which flows in an inductor through a switching element which performs a switching operation in response to a PWM signal, and forms an output voltage by a capacitor which is provided in series in the inductor, a booster circuit which is constituted of a bootstrap capacity and a MOSFET is provided between an output node of the switching element and a predetermined voltage terminal. The boosted voltage is used as an operational voltage of a driving circuit of the switching element, another source/drain region and a substrate gate are connected with each other, and a junction diode between one source/drain region and the substrate gate is inversely directed with respect to the boosted voltage which is formed by the bootstrap capacity.Type: ApplicationFiled: September 13, 2012Publication date: January 3, 2013Inventors: KYOICHI HOSOKAWA, Ryotaro Kudo, Toshio Nagasawa, Koji Tateno
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Publication number: 20120286365Abstract: In a switching power source which controls a current which flows in an inductor through a switching element which performs a switching operation in response to a PWM signal, and forms an output voltage by a capacitor which is provided in series in the inductor, a booster circuit which is constituted of a bootstrap capacity and a MOSFET is provided between an output node of the switching element and a predetermined voltage terminal. The boosted voltage is used as an operational voltage of a driving circuit of the switching element, another source/drain region and a substrate gate are connected with each other, and a junction diode between one source/drain region and the substrate gate is inversely directed with respect to the boosted voltage which is formed by the bootstrap capacity.Type: ApplicationFiled: May 11, 2012Publication date: November 15, 2012Inventors: KYOICHI HOSOKAWA, Ryotaro Kudo, Toshio Nagasawa, Koji Tateno
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Patent number: 8305060Abstract: In a switching power source which controls a current which flows in an inductor through a switching element which performs a switching operation in response to a PWM signal, and forms an output voltage by a capacitor which is provided in series in the inductor, a booster circuit which is constituted of a bootstrap capacity and a MOSFET is provided between an output node of the switching element and a predetermined voltage terminal. The boosted voltage is used as an operational voltage of a driving circuit of the switching element, another source/drain region and a substrate gate are connected with each other such that when the MOSFET is made to assume an OFF state, and a junction diode between one source/drain region and the substrate gate is inversely directed with respect to the boosted voltage which is formed by the bootstrap capacity.Type: GrantFiled: October 11, 2011Date of Patent: November 6, 2012Assignee: Renesas Electronics CorporationInventors: Kyoichi Hosokawa, Ryotaro Kudo, Toshio Nagasawa, Koji Tateno
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Publication number: 20120086416Abstract: Miniaturization of a multiphase type power supply device can be achieved. A power supply control unit in which, for example, a microcontroller unit, a memory unit and an analog controller unit are formed over a single chip, a plurality of PWM-equipped drive units, and a plurality of inductors configure a multiphase power supply. The microcontroller unit outputs clock signals each having a frequency and a phase defined based on a program on the memory unit to the respective PWM-equipped drive units. The analog controller unit detects a difference between a voltage value of a load and a target voltage value acquired via a serial interface and outputs an error amp signal therefrom. Each of the PWM-equipped drive units drives each inductor by a peak current control system using the clock signal and the error amp signal.Type: ApplicationFiled: September 12, 2011Publication date: April 12, 2012Applicant: RENESAS ELECTRONICS CORPORATIONInventors: Ryotaro KUDO, Tomoaki UNO, Koji TATENO, Hideo ISHII, Kazuyuki UMEZU, Koji SAIKUSA
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Publication number: 20120086062Abstract: In a switching power source which controls a current which flows in an inductor through a switching element which performs a switching operation in response to a PWM signal, and forms an output voltage by a capacitor which is provided in series in the inductor, a booster circuit which is constituted of a bootstrap capacity and a MOSFET is provided between an output node of the switching element and a predetermined voltage terminal. The boosted voltage is used as an operational voltage of a driving circuit of the switching element, another source/drain region and a substrate gate are connected with each other such that when the MOSFET is made to assume an OFF state, and a junction diode between one source/drain region and the substrate gate is inversely directed with respect to the boosted voltage which is formed by the bootstrap capacity.Type: ApplicationFiled: October 11, 2011Publication date: April 12, 2012Inventors: KYOICHI HOSOKAWA, Ryotaro Kudo, Toshio Nagasawa, Koji Tateno
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Patent number: 8125206Abstract: A power-supply control IC is included in a switching power supply which drives to turn on and off a semiconductor switching device connected to a DC power supply in series to supply a predetermined constant voltage to an external load, and is a semiconductor device including a semiconductor circuit which controls on and off of the semiconductor switching device. When a current flowing through the load is abruptly increased to cause an error voltage to exceed a predetermined first threshold voltage after the end of a PWM on-pulse generated in synchronization with a switching cycle, a second PWM on-pulse is generated within the same switching cycle. Furthermore, in a plurality of switching cycles after the switching cycle in which the second PWM on-pulse is generated, the first threshold voltage for comparison with the error voltage is switched to a second threshold voltage higher than the first threshold voltage.Type: GrantFiled: June 20, 2008Date of Patent: February 28, 2012Assignee: Renesas Electronics CorporationInventors: Noboru Akiyama, Takayuki Hashimoto, Takashi Hirao, Koji Tateno
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Patent number: 8120345Abstract: A semiconductor device for control applied to a constant-voltage power supply device includes a digital-analog converter circuit which outputs a reference voltage corresponding to a value of a first register with taking an output voltage of a reference voltage source as a criterial reference voltage, and generates a control signal for driving a power semiconductor device based on an output voltage of an error amplifier which differentially amplifies a feedback voltage obtained by resistive-dividing on an output voltage of the constant-voltage power supply device and the reference voltage. An analog-digital converter circuit which converts the feedback voltage to a digital value with taking the output voltage of the constant-voltage power supply device as a reference voltage is provided, and based on the output, a value of a first register is corrected so as to offset an effect of an error in voltage dividing ratio of a voltage dividing resistor circuit.Type: GrantFiled: February 19, 2009Date of Patent: February 21, 2012Assignee: Renesas Electronics CorporationInventors: Noboru Akiyama, Takayuki Hashimoto, Takashi Hirao, Koji Tateno, Takuya Ishigaki
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Patent number: 8063620Abstract: The present invention provides a switching power source and a semiconductor integrated circuit which realize an acquisition a sufficient driving voltage of a high-potential side switching element M1 even when a power source voltage VDD is low.Type: GrantFiled: February 9, 2011Date of Patent: November 22, 2011Assignee: Renesas Electronics CorporationInventors: Kyoichi Hosokawa, Ryotaro Kudo, Toshio Nagasawa, Koji Tateno
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Patent number: 8044520Abstract: A power supply capable of reducing loss of large current and high frequency. In an MCM for power supply in which a high-side power MOSFET chip, a low-side power MOSFET chip and a driver IC chip driving them are sealed in one sealing material (a capsulating insulation resin), a wiring length of a wiring DL connecting an output terminal of the driver IC chip to a gate terminal of the low-side power MOSFET chip or a source terminal is made shorter than a wiring length of a wiring DH connecting the output terminal of the driver IC chip to a gate terminal of the high-side power MOSFET chip or a source terminal. Further, the number of the wiring DL is made larger than the number of the wiring DH.Type: GrantFiled: January 19, 2007Date of Patent: October 25, 2011Assignee: Renesas Electronics CorporationInventors: Noboru Akiyama, Takayuki Hashimoto, Masaki Shiraishi, Tetsuya Kawashima, Koji Tateno, Nobuyoshi Matsuura
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Publication number: 20110127982Abstract: The present invention provides a voltage clamping circuit which is operated in a stable manner with the simple constitution and a switching power source device which enables a high-speed operation. In a switching power source device, one of source/drain routes is connected to an input terminal to which an input voltage is supplied, a predetermined voltage to be restricted is supplied to a gate, and using a MOSFET which provides a current source between another source/drain route and a ground potential of the circuit, a clamp output voltage which corresponds to the input voltage is obtained from another source/drain route. The switching power source device further includes a first switching element which controls a current which is made to flow in an inductor such that the output voltage assumes a predetermined voltage and a second switching element which clamps an reverse electromotive voltage generated in the inductor when the first switching element is turned off to a predetermined potential.Type: ApplicationFiled: February 2, 2011Publication date: June 2, 2011Inventors: Ryotaro KUDO, Koji TATENO
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Publication number: 20110127975Abstract: The present invention provides a switching power source and a semiconductor integrated circuit which realize an acquisition a sufficient driving voltage of a high-potential side switching element M1 even when a power source voltage VDD is low.Type: ApplicationFiled: February 9, 2011Publication date: June 2, 2011Inventors: KYOICHI HOSOKAWA, Ryotaro Kudo, Toshio Nagasawa, Koji Tateno
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Patent number: 7902799Abstract: The present invention provides a switching power source and a semiconductor integrated circuit which realize an acquisition a sufficient driving voltage of a high-potential side switching element M1 even when a power source voltage VDD is low.Type: GrantFiled: March 13, 2009Date of Patent: March 8, 2011Assignee: Renesas Electronics CorporationInventors: Kyoichi Hosokawa, Ryotaro Kudo, Toshio Nagasawa, Koji Tateno
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Patent number: 7898232Abstract: The present invention provides a voltage clamping circuit which is operated in a stable manner with the simple constitution and a switching power source device which enables a high-speed operation. In a switching power source device, one of source/drain routes is connected to an input terminal to which an input voltage is supplied, a predetermined voltage to be restricted is supplied to a gate, and using a MOSFET which provides a current source between another source/drain route and a ground potential of the circuit, a clamp output voltage which corresponds to the input voltage is obtained from another source/drain route. The switching power source device further includes a first switching element which controls a current which is made to flow in an inductor such that the output voltage assumes a predetermined voltage and a second switching element which clamps an reverse electromotive voltage generated in the inductor when the first switching element is turned off to a predetermined potential.Type: GrantFiled: August 3, 2009Date of Patent: March 1, 2011Assignee: Renesas Electronics CorporationInventors: Ryotaro Kudo, Koji Tateno