Patents by Inventor Kesanobu Kuwabara
Kesanobu Kuwabara 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: 10230306Abstract: A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter (10) constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device that performs a specific state transition of the DC/DC converter (10) after a change rate of a magnitude of a current flowing through a winding of a primary or secondary side of a transformer (TR) with respect to time reaches a value within a predetermined change rate range.Type: GrantFiled: May 2, 2017Date of Patent: March 12, 2019Assignee: OMRON CorporationInventors: Masayuki Suetomi, Katsuji Mitsui, Isao Fujihata, Kesanobu Kuwabara, Yoshihiko Yamaguchi, Makoto Ohashi
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Patent number: 10008938Abstract: A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter (10) constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device in which a direction of a current flowing through a winding of a transformer (TR) is switched after a magnitude of the current flowing through the winding of the transformer (TR) reaches “0.Type: GrantFiled: May 2, 2017Date of Patent: June 26, 2018Assignee: OMRON CorporationInventors: Isao Fujihata, Masayuki Suetomi, Kesanobu Kuwabara, Makoto Ohashi, Yoshihiko Yamaguchi
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Patent number: 9847723Abstract: A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter (10) constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device that performs a predetermined state transition of the DC/DC converter (10) after waiting for a load current value of a primary or secondary side of a transformer (TR) becomes a value within a predetermined current value range.Type: GrantFiled: May 2, 2017Date of Patent: December 19, 2017Assignee: OMRON CorporationInventors: Masayuki Suetomi, Katsuji Mitsui, Isao Fujihata, Kesanobu Kuwabara, Yoshihiko Yamaguchi, Makoto Ohashi
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Patent number: 9837908Abstract: A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter (10) constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device that performs predetermined state transition of the DC/DC converter (10) after waiting for a load current value of a secondary side of a transformer (TR) to be a value within a predetermined current value range.Type: GrantFiled: May 2, 2017Date of Patent: December 5, 2017Assignee: OMRON CorporationInventors: Masayuki Suetomi, Katsuji Mitsui, Isao Fujihata, Kesanobu Kuwabara, Yoshihiko Yamaguchi, Makoto Ohashi
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Publication number: 20170324336Abstract: A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter (10) constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device that performs a specific state transition of the DC/DC converter (10) after a change rate of a magnitude of a current flowing through a winding of a primary or secondary side of a transformer (TR) with respect to time reaches a value within a predetermined change rate range.Type: ApplicationFiled: May 2, 2017Publication date: November 9, 2017Applicant: OMRON CorporationInventors: Masayuki SUETOMI, Katsuji MITSUI, Isao FUJIHATA, Kesanobu KUWABARA, Yoshihiko YAMAGUCHI, Makoto OHASHI
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Publication number: 20170324334Abstract: A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter (10) constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device in which a direction of a current flowing through a winding of a transformer (TR) is switched after a magnitude of the current flowing through the winding of the transformer (TR) reaches “0.Type: ApplicationFiled: May 2, 2017Publication date: November 9, 2017Applicant: OMRON CorporationInventors: Isao FUJIHATA, Masayuki SUETOMI, Kesanobu KUWABARA, Makoto OHASHI, Yoshihiko YAMAGUCHI
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Publication number: 20170324335Abstract: A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter (10) constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device that performs a predetermined state transition of the DC/DC converter (10) after waiting for a load current value of a primary or secondary side of a transformer (TR) becomes a value within a predetermined current value range.Type: ApplicationFiled: May 2, 2017Publication date: November 9, 2017Applicant: OMRON CorporationInventors: Masayuki SUETOMI, Katsuji MITSUI, Isao FUJIHATA, Kesanobu KUWABARA, Yoshihiko YAMAGUCHI, Makoto OHASHI
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Publication number: 20170324337Abstract: A power conversion device, which includes an insulation type full bridge converter and can switch a power transmission direction at a high speed, is provided. A DC/DC converter (10) constitutes a power conversion device, which operates as a first type converter that converts a voltage within a first range applied to a first input/output terminal pair into a voltage within a second range and outputs the voltage from a second input/output terminal pair or a second type converter that converts a voltage within the second range applied to the second input/output terminal pair into a voltage within the first range and outputs the voltage from the first input/output terminal pair, as a device that performs predetermined state transition of the DC/DC converter (10) after waiting for a load current value of a secondary side of a transformer (TR) to be a value within a predetermined current value range.Type: ApplicationFiled: May 2, 2017Publication date: November 9, 2017Applicant: OMRON CorporationInventors: Masayuki SUETOMI, Katsuji MITSUI, Isao FUJIHATA, Kesanobu KUWABARA, Yoshihiko YAMAGUCHI, Makoto OHASHI
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Patent number: 8164276Abstract: A drive circuit drives LED groups each of which has a plurality of LEDs connected in series. The drive circuit includes nMOSFETs which drive the LED groups, current regulating circuits which determine drain currents of the nMOSFETs, and subtracters which control the current regulating circuits to keep the sum of the current values of adjacent two nMOSFETs constant. The LEDs can be switched on/off efficiently even when there are differences between forward voltages of the LEDs.Type: GrantFiled: October 30, 2009Date of Patent: April 24, 2012Assignee: Fuji Electric Co., Ltd.Inventor: Kesanobu Kuwabara
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Publication number: 20100194298Abstract: A drive circuit drives LED groups each of which has a plurality of LEDs connected in series. The drive circuit includes nMOSFETs which drive the LED groups, current regulating circuits which determine drain currents of the nMOSFETs, and subtracters which control the current regulating circuits to keep the sum of the current values of adjacent two nMOSFETs constant. The LEDs can be switched on/off efficiently even when there are differences between forward voltages of the LEDs.Type: ApplicationFiled: October 30, 2009Publication date: August 5, 2010Applicant: FUJI ELECTRIC SYSTEMS CO., LTD.Inventor: Kesanobu KUWABARA
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Patent number: 7615984Abstract: A DC-DC converter can prevent intermittent failure of a PWM or driving signal (VM) when a load becomes light and prevent generation of unusual noise from a transformer. The converter includes a transformer (2) having a primary winding (2a) and a secondary winding (2b), a semiconductor switching element (17) connected to the primary winding (2a), and a control unit controlling turning-ON and OFF periods of the switching element (17) so that an output voltage (VO) matches a reference value (VREF). By controlling the turning ON and OFF operation of the switching element (17), a DC voltage exactly equal to the reference value (VREF) can be supplied to a load (5).Type: GrantFiled: September 6, 2006Date of Patent: November 10, 2009Assignee: Fuji Electric Device Technology Co., Ltd.Inventor: Kesanobu Kuwabara
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Patent number: 7245087Abstract: A power conversion device has a series circuit of a main switching element and a sub-switching element connected to both ends of a DC power supply, an insulating transformer, and control circuits. The main switching and sub-switching elements are alternately turned on and off by the respective control circuits such that voltage generated in the secondary coil is subjected to smoothing rectification and supplied to a load. The insulating transformer includes a primary coil, and the main control circuit takes voltage of the primary coil as signal voltage to cause the main switching element to turn on and off such that DC voltage supplied to the load is constant. The sub-control circuit turns on the sub-switching element when the voltage at both ends of the sub-switching element becomes lower than a reference voltage or when the voltage of the primary coil exceeds a predetermined value.Type: GrantFiled: October 25, 2005Date of Patent: July 17, 2007Assignee: Fuji Electric Device Technology Co., Ltd.Inventors: Yukihiro Nishikawa, Kesanobu Kuwabara
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Patent number: 7206209Abstract: A switching power source device can enhance the power factor by increasing the conduction angle of an input current in a wide input voltage range, while obviating the increase of size and the increase of cost thereof, and lower the switching loss by removing higher harmonic waves from the input current. The device includes at least first, second, and third series circuits constituted of a rectifying circuit, at least first and second primary windings, a plurality of diodes, a smoothing capacitor, and first and second switching elements.Type: GrantFiled: February 5, 2004Date of Patent: April 17, 2007Assignee: Fuji Electric Device Technology Co., Ltd.Inventor: Kesanobu Kuwabara
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Publication number: 20070064453Abstract: A DC-DC converter can prevent intermittent failure of a PWM or driving signal (VM) when a load becomes light and prevent generation of unusual noise from a transformer. The converter includes a transformer (2) having a primary winding (2a) and a secondary winding (2b), a semiconductor switching element (17) connected to the primary winding (2a), and a control unit controlling turning-ON and OFF periods of the switching element (17) so that an output voltage (VO) matches a reference value (VREF). By controlling the turning ON and OFF operation of the switching element (17), a DC voltage exactly equal to the reference value (VREF) can be supplied to a load (5).Type: ApplicationFiled: September 6, 2006Publication date: March 22, 2007Applicant: FUJI ELECTRIC DEVICE TECHNOLOGY CO., LTD.Inventor: Kesanobu KUWABARA
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Publication number: 20060119281Abstract: A power conversion device has a series circuit of a main switching element and a sub-switching element connected to both ends of a DC power supply, an insulating transformer, and control circuits. The main switching and sub-switching elements are alternately turned on and off by the respective control circuits such that voltage generated in the secondary coil is subjected to smoothing rectification and supplied to a load. The insulating transformer includes a primary coil, and the main control circuit takes voltage of the primary coil as signal voltage to cause the main switching element to turn on and off such that DC voltage supplied to the load is constant. The sub-control circuit turns on the sub-switching element when the voltage at both ends of the sub-switching element becomes lower than a reference voltage or when the voltage of the primary coil exceeds a predetermined value.Type: ApplicationFiled: October 25, 2005Publication date: June 8, 2006Applicant: Fuji Electric Device Technology Co., Ltd.Inventors: Yukihiro Nishikawa, Kesanobu Kuwabara
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Publication number: 20040252528Abstract: A switching power source device can enhance the power factor by increasing the conduction angle of an input current in a wide input voltage range, while obviating the increase of size and the increase of cost thereof, and lower the switching loss by removing higher harmonic waves from the input current. The device includes at least first, second, and third series circuits constituted of a rectifying circuit, at least first and second primary windings, a plurality of diodes, a smoothing capacitor, and first and second switching elements.Type: ApplicationFiled: February 5, 2004Publication date: December 16, 2004Inventor: Kesanobu Kuwabara