Patents by Inventor Tetsuya Kawashima
Tetsuya Kawashima 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: 9755527Abstract: A switching power supply device includes an output voltage detection unit that outputs an output voltage detection value. The control circuit includes: a target voltage generation unit that generates an output voltage setting value; an A/D conversion unit that A/D converts an error between the output voltage setting value and the output voltage detection value; a digital compensation unit that computes an amount of control based on an output signal of the A/D conversion unit; and a PWM signal generation unit that generates a PWM signal for the switching element based on the amount of control. The target voltage generation unit detects a standby state based on the output voltage detection value, the output signals of the A/D conversion unit and the digital compensation unit, and in the standby state, switches the output voltage setting value to a second value lower than a value for another state.Type: GrantFiled: September 23, 2016Date of Patent: September 5, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventor: Tetsuya Kawashima
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Patent number: 9729069Abstract: A control section for a current resonant converter section controls a DC output voltage of a current resonant converter section to settle to a target voltage by varying a resonant period between predetermined two resonant periods based on an error signal between the DC output voltage and the target voltage. A gain converter is provided in a preceding stage of a frequency generator for generating a square waveform signal with a duty ratio of 50% and the gain converter has a setting of a nonlinear gain characteristic that cancels nonlinearity in the input-output characteristics of the current resonant converter section. The nonlinear gain characteristic can be a characteristic of continuous gain conversion or discrete gain conversion.Type: GrantFiled: June 13, 2014Date of Patent: August 8, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventor: Tetsuya Kawashima
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Publication number: 20170149339Abstract: A switching power supply device includes an output voltage detection unit that outputs an output voltage detection value. The control circuit includes: a target voltage generation unit that generates an output voltage setting value; an A/D conversion unit that A/D converts an error between the output voltage setting value and the output voltage detection value; a digital compensation unit that computes an amount of control based on an output signal of the A/D conversion unit; and a PWM signal generation unit that generates a PWM signal for the switching element based on the amount of control. The target voltage generation unit detects a standby state based on the output voltage detection value, the output signals of the A/D conversion unit and the digital compensation unit, and in the standby state, switches the output voltage setting value to a second value lower than a value for another state.Type: ApplicationFiled: September 23, 2016Publication date: May 25, 2017Applicant: FUJI ELECTRIC CO., LTD.Inventor: Tetsuya KAWASHIMA
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Patent number: 9602012Abstract: An output voltage error detection unit outputs an auxiliary winding voltage generated across an auxiliary winding having the same number of turns as a secondary winding a certain period after a secondary conduction period starts. A correction amount calculation unit calculates a secondary voltage drop caused by a secondary current flowing in the conduction period based on a primary current flowing when the conduction period starts and outputs a calculation result as a correction amount. A reference voltage generation unit generates a reference voltage by adding the correction amount to the output voltage. A control unit generates a feedback signal to minimize the error between the auxiliary winding voltage obtained after a certain delay period and the reference voltage. A PWM signal generation unit controls a PWM signal based on the feedback signal, adjusts switching of the switching element, and maintains the output voltage at a constant level.Type: GrantFiled: May 9, 2016Date of Patent: March 21, 2017Assignee: FUJI ELECTRIC CO., LTD.Inventor: Tetsuya Kawashima
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Publication number: 20170040906Abstract: The present invention reduces the footprint of a power conversion device. A first power semiconductor module and a second power semiconductor module are connected to a positive conductor, a negative conductor, and an alternating-current conductor. An external alternating-current terminal, the first power semiconductor module, the second power semiconductor module, a capacitor, and an external direct-current terminal including an external positive terminal and an external negative terminal are arrayed on a straight line extending in the longitudinal direction of a circuit connection section. The external alternating-current terminal is disposed at one longitudinal end of the circuit connection section. The external direct-current terminal is disposed at the other longitudinal end of the circuit connection section.Type: ApplicationFiled: March 2, 2015Publication date: February 9, 2017Inventors: Yukio HATTORI, Hiroshi KAMIZUMA, Tetsuya KAWASHIMA, Akira MIMA, Daisuke MATSUMOTO, Yuuichi MABUCHI
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Publication number: 20170033593Abstract: An uninterruptible power-supply system is a power converter having a PN laminated bus bar and a plurality of power conversion units and supplying power from a commercial power supply via a converter and an inverter. The power conversion units each have positive side terminals connected to each other and negative side terminals connected to each other through the PN laminated bus bar. At least one power conversion unit constitutes a phase of the converter. At least another one power conversion unit constitutes a phase of the inverter and has the positive side terminal lying adjacent to and connected through the PN laminated bus bar to the positive side terminal of the corresponding power conversion unit constituting the phase of the converter and the negative side terminal lying adjacent to and connected to the negative side terminal of the corresponding power conversion unit constituting the phase of the converter.Type: ApplicationFiled: May 7, 2014Publication date: February 2, 2017Inventors: Hiroshi KAMIZUMA, Yukio HATTORI, Tetsuya KAWASHIMA, Akira MIMA, Daisuke MATSUMOTO, Yuuichi MABUCHI
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Patent number: 9532489Abstract: A power conversion device capable of reducing a temperature variation between a plurality of semiconductor modules is provided. The power conversion device comprises condensers 121, 122, a plurality of semiconductor modules 101, 102, heat dissipation units 103 to 109, a bus bar 140 connecting the condensers 121, 122 with the plurality of the semiconductor modules 101, 102, and a ventilation unit having cool wind blow. The power conversion module has features that the plurality of semiconductor modules 101, 102 are arranged apart from the condensers 121, 122 and in a line in a longitudinal direction of the bus bar 140 and that the cool wind 150 blows in a direction from the condensers 121, 122 toward the plurality of semiconductor modules 101, 102 that are mounted.Type: GrantFiled: June 25, 2015Date of Patent: December 27, 2016Assignee: Hitachi, Ltd.Inventors: Yuuichi Mabuchi, Tetsuya Kawashima, Daisuke Matsumoto, Akira Mima, Yukio Hattori, Hiroshi Kamizuma
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Publication number: 20160373011Abstract: An output voltage error detection unit outputs an auxiliary winding voltage generated across an auxiliary winding having the same number of turns as a secondary winding a certain period after a secondary conduction period starts. A correction amount calculation unit calculates a secondary voltage drop caused by a secondary current flowing in the conduction period based on a primary current flowing when the conduction period starts and outputs a calculation result as a correction amount. A reference voltage generation unit generates a reference voltage by adding the correction amount to the output voltage. A control unit generates a feedback signal to minimize the error between the auxiliary winding voltage obtained after a certain delay period and the reference voltage. A PWM signal generation unit controls a PWM signal based on the feedback signal, adjusts switching of the switching element, and maintains the output voltage at a constant level.Type: ApplicationFiled: May 9, 2016Publication date: December 22, 2016Applicant: FUJI ELECTRIC CO., LTD.Inventor: Tetsuya KAWASHIMA
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Publication number: 20160373017Abstract: An imbalance of control signals between two power semiconductor elements is reduced. A first power semiconductor module and a second power semiconductor module are arranged in a predetermined direction along a surface of a control signal wiring circuit board, each of longitudinal directions of the first power semiconductor module and the second power semiconductor module along the surface of the control signal wiring circuit board is a predetermined direction, and, in a first control signal wiring, a distance between an external control signal terminal and a second control signal terminal is equal to a distance between the external control signal terminal and a first control signal terminal.Type: ApplicationFiled: March 10, 2014Publication date: December 22, 2016Inventors: Akira MIMA, Yukio HATTORI, Tetsuya KAWASHIMA, Yuichi MABUCHI, Daisuke MATSUMOTO, Hiroshi KAMIDUMA
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Publication number: 20160359418Abstract: A switching controller includes an output voltage detector that detects the output voltage of a switching power supply, a compensator, a frequency setter, a frequency sweeper, and a voltage control oscillator that are all connected in series. The switching controller also includes an ON-time generator that generates an ON time for a switching element and a pulse-width modulation signal generator that generates a pulse-width modulation signal using the output from the voltage control oscillator and the output from the ON-time generator.Type: ApplicationFiled: May 10, 2016Publication date: December 8, 2016Applicant: Fuji Electric Co., Ltd.Inventor: Tetsuya KAWASHIMA
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Publication number: 20160345463Abstract: A cooling structure of a heating element includes: the heating element having at least one cooling surface from which a plurality of pin fins project; a heat receiving plate which has a shape complying with the cooling surface and in which holes are formed at positions facing each pin fin, each pin fin being movably inserted into the holes; a cooler which has a pair of clamping members that sandwich therebetween the heating element and the heat receiving plate while pressing the heating element and the heat receiving plate, and which cools the heat receiving plate; and a space securing part which is provided on the heat receiving plate and suppresses a distance between the pair of clamping members so as not to apply a pressing force by the clamping members to the heating element.Type: ApplicationFiled: August 8, 2016Publication date: November 24, 2016Inventors: Daisuke MATSUMOTO, Akira MIMA, Tetsuya KAWASHIMA, Yuuichi MABUCHI, Yukio HATTORI, Hiroshi KAMIZUMA, Ryouhei MIYAGAWA, Tomonori ICHIKAWA
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Patent number: 9497887Abstract: A cooling structure is provided. The cooling structure includes cooling surfaces on two confronting side surfaces; a plurality of double-sided-cooling power module, the heat receiving block pinching the heating elements arranged in a vertical direction on the confronting side surfaces, first and second cooling devices, each including the heat radiating fins, disposed above the heating elements, extending in a horizontal direction, and a pressure contacting part configured to contact the heating elements and the receiving block with a pressure force. The heat radiation fins are blown from a side of the electric terminal.Type: GrantFiled: December 12, 2014Date of Patent: November 15, 2016Assignee: HITACHI, LTD.Inventors: Daisuke Matsumoto, Yuuichi Mabuchi, Akira Mima, Tetsuya Kawashima, Yukio Hattori, Hiroshi Kamizuma, Ryouhei Miyagawa, Tomonori Ichikawa
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Patent number: 9437797Abstract: A cooling structure of a heating element includes: the heating element having at least one cooling surface from which a plurality of pin fins project; a heat receiving plate which has a shape complying with the cooling surface and in which holes are formed at positions facing each pin fin, each pin fin being movably inserted into the holes; a cooler which has a pair of clamping members that sandwich therebetween the heating element and the heat receiving plate while pressing the heating element and the heat receiving plate, and which cools the heat receiving plate; and a space securing part which is provided on the heat receiving plate and suppresses a distance between the pair of clamping members so as not to apply a pressing force by the clamping members to the heating element.Type: GrantFiled: August 5, 2015Date of Patent: September 6, 2016Assignee: Hitachi, Ltd.Inventors: Daisuke Matsumoto, Akira Mima, Tetsuya Kawashima, Yuuichi Mabuchi, Yukio Hattori, Hiroshi Kamizuma, Ryouhei Miyagawa, Tomonori Ichikawa
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Publication number: 20160226396Abstract: To improve accessibility with respect to a power conversion unit in a power converter. The power converter includes a circuit, connection part including a positive electrode conductor, a negative electrode conductor and an AC conductor, a power semiconductor module positioned in a particular direction with respect to the circuit connection part and connected to the positive electrode conductor, the negative electrode conductor and the AC conductor and a capacitor positioned in the particular direction with respect to the circuit connection part and connected to the positive electrode conductor and the negative electrode conductor. The positive electrode conductor is connected to a positive electrode conductor of another power conversion unit through a unit connection part positioned in an opposite direction of the particular direction with respect to the circuit connection part.Type: ApplicationFiled: March 27, 2014Publication date: August 4, 2016Inventors: Yukio HATTORI, Hiroshi KAMIZUMA, Daisuke MATSUMOTO, Akira MIMA, Tetsuya KAWASHIMA, Yuuichi MABUCHI
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Publication number: 20160093788Abstract: A cooling structure of a heating element includes: the heating element having at least one cooling surface from which a plurality of pin fins project; a heat receiving plate which has a shape complying with the cooling surface and in which holes are formed at positions facing each pin fin, each pin fin being movably inserted into the holes; a cooler which has a pair of clamping members that sandwich therebetween the heating element and the heat receiving plate while pressing the heating element and the heat receiving plate, and which cools the heat receiving plate; and a space securing part which is provided on the heat receiving plate and suppresses a distance between the pair of clamping members so as not to apply a pressing force by the clamping members to the heating element.Type: ApplicationFiled: August 5, 2015Publication date: March 31, 2016Inventors: Daisuke MATSUMOTO, Akira MIMA, Tetsuya KAWASHIMA, Yuuichi MABUCHI, Yukio HATTORI, Hiroshi KAMIZUMA, Ryouhei MIYAGAWA, Tomonori ICHIKAWA
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Publication number: 20160049315Abstract: A conventional semiconductor device used for a power supply circuit such as a DC/DC converter has problems of heat dissipation and downsizing, in particular has the problems of heat dissipation and others in the event of downsizing. A semiconductor device has a structure formed by covering a principal surface of a semiconductor chip having the principal surface and a plurality of MIS type FETs formed over the principal surface with a plurality of metal plate wires having pectinate shapes; allocating the pectinate parts alternately in a planar view over the principal surface; and further electrically coupling the plural metal plate wires to a plurality of terminals.Type: ApplicationFiled: October 27, 2015Publication date: February 18, 2016Applicant: RENESAS ELECTRONICS CORPORATIONInventors: Tomoaki UNO, Tetsuya KAWASHIMA
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Patent number: 9236321Abstract: A conventional semiconductor device used for a power supply circuit such as a DC/DC converter has problems of heat dissipation and downsizing, in particular has the problems of heat dissipation and others in the event of downsizing. A semiconductor device has a structure formed by covering a principal surface of a semiconductor chip having the principal surface and a plurality of MIS type FETs formed over the principal surface with a plurality of metal plate wires having pectinate shapes; allocating the pectinate parts alternately in a planar view over the principal surface; and further electrically coupling the plural metal plate wires to a plurality of terminals.Type: GrantFiled: January 30, 2013Date of Patent: January 12, 2016Assignee: Renesas Electronics CorporationInventors: Tomoaki Uno, Tetsuya Kawashima
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Publication number: 20160007507Abstract: A power conversion device capable of reducing a temperature variation between a plurality of semiconductor modules is provided. The power conversion device comprises condensers 121, 122, a plurality of semiconductor modules 101, 102, heat dissipation units 103 to 109, a bus bar 140 connecting the condensers 121, 122 with the plurality of the semiconductor modules 101, 102, and a ventilation unit having cool wind blow. The power conversion module has features that the plurality of semiconductor modules 101, 102 are arranged apart from the condensers 121, 122 and in a line in a longitudinal direction of the bus bar 140 and that the cool wind 150 blows in a direction from the condensers 121, 122 toward the plurality of semiconductor modules 101, 102 that are mounted.Type: ApplicationFiled: June 25, 2015Publication date: January 7, 2016Inventors: Yuuichi MABUCHI, Tetsuya KAWASHIMA, Daisuke MATSUMOTO, Akira MIMA, Yukio HATTORI, Hiroshi KAMIZUMA
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Publication number: 20150340934Abstract: An inverter device is configured such that a pull-out direction for a direct current cable to be connected an external power source is adjustable without modifying the shape of a motor and the shape of the inverter device body, thereby reducing the packaging volume including the direct current cable. To this end, a DC bus bar 96 that connects a smoothing capacitor 90 to semiconductor modules 500a to 500c is provided with two pairs of positive and negative terminals 92a, 94a, 92b, and 94b to be connected to an external power source 30. The positive and negative terminals 92a and 94a and the positive and negative terminals 92b and 94b respectively project from different side surfaces of an inverter housing 110.Type: ApplicationFiled: October 21, 2013Publication date: November 26, 2015Inventors: Kosuke SUZUKI, Hideki MIYAZAKI, Tetsuya KAWASHIMA, Kazuto OYAMA
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Publication number: 20150250074Abstract: A cooling structure is provided. The cooling structure includes cooling surfaces on two confronting side surfaces; a plurality of double-sided-cooling power module, the heat receiving block pinching the heating elements arranged in a vertical direction on the confronting side surfaces, first and second cooling devices, each including the heat radiating fins, disposed above the heating elements, extending in a horizontal direction, and a pressure contacting part configured to contact the heating elements and the receiving block with a pressure force. The heat radiation fins are blown from a side of the electric terminal.Type: ApplicationFiled: December 12, 2014Publication date: September 3, 2015Applicant: HITACHI, LTD.Inventors: Daisuke MATSUMOTO, Yuuichi MABUCHI, Akira MIMA, Tetsuya KAWASHIMA, Yukio HATTORI, Hiroshi KAMIZUMA, Ryouhei MIYAGAWA, Tomonori ICHIKAWA