Patents by Inventor Hideji Yoshida
Hideji Yoshida 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: 11831302Abstract: A drive circuit drives a switch configuring a power converter. The drive circuit divides an inter-terminal voltage of a switch. The drive circuit includes a differential circuit having first and second input terminals to which the divided inter-terminal voltages are inputted. The differential circuit outputs an analog voltage based on a voltage difference between the input terminals. The differential circuit executes reset of the output voltage, and with the voltage difference when reset is canceled after reset is executed as a reference voltage, outputs an analog voltage in which an amount of change from the reference voltage is multiplied by an amplification factor. The drive circuit outputs a binary signal based on comparison results between a threshold and the analog voltage outputted from the differential circuit, and sets a transfer rate of a gate charge of the switch when a driving state is switched, based on the output signal thereof.Type: GrantFiled: December 14, 2021Date of Patent: November 28, 2023Assignee: DENSO CORPORATIONInventors: Yuuta Nakamura, Yasuaki Aoki, Hideji Yoshida, Takashi Yoshiya, Tomohiro Nezuka, Akimasa Niwa
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Publication number: 20220109438Abstract: A drive circuit drives a switch configuring a power converter. The drive circuit divides an inter-terminal voltage of a switch. The drive circuit includes a differential circuit having first and second input terminals to which the divided inter-terminal voltages are inputted. The differential circuit outputs an analog voltage based on a voltage difference between the input terminals. The differential circuit executes reset of the output voltage, and with the voltage difference when reset is canceled after reset is executed as a reference voltage, outputs an analog voltage in which an amount of change from the reference voltage is multiplied by an amplification factor. The drive circuit outputs a binary signal based on comparison results between a threshold and the analog voltage outputted from the differential circuit, and sets a transfer rate of a gate charge of the switch when a driving state is switched, based on the output signal thereof.Type: ApplicationFiled: December 14, 2021Publication date: April 7, 2022Applicant: DENSO CORPORATIONInventors: Yuuta NAKAMURA, Yasuaki AOKI, Hideji YOSHIDA, Takashi YOSHIYA, Tomohiro NEZUKA, Akimasa NIWA
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Patent number: 10892698Abstract: In a current detection apparatus, an arm current detection unit detects each of at least first and second phase currents having respective amplitudes and flowing in a multiphase rotary electric machine based on a potential difference between input and output terminals of the corresponding one of first and second detection switches during the corresponding one of the first and second detection switches being on. A bus current detection unit detects each of at least bus-based first and second phase currents corresponding to the first and second phases of the multiphase rotary electric machine based on a current flowing through one of first and second buses. An amplitude correction unit corrects the first and second phase currents based on the bus-based first and second phase currents such that the amplitudes of the respective first and second phase currents match with each other.Type: GrantFiled: December 29, 2016Date of Patent: January 12, 2021Assignee: DENSO CORPORATIONInventors: Yasuaki Aoki, Yosuke Matsuki, Hideji Yoshida
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Publication number: 20170201201Abstract: In a current detection apparatus, an arm current detection unit detects each of at least first and second phase currents having respective amplitudes and flowing in a multiphase rotary electric machine based on a potential difference between input and output terminals of the corresponding one of first and second detection switches during the corresponding one of the first and second detection switches being on. A bus current detection unit detects each of at least bus-based first and second phase currents corresponding to the first and second phases of the multiphase rotary electric machine based on a current flowing through one of first and second buses. An amplitude correction unit corrects the first and second phase currents based on the bus-based first and second phase currents such that the amplitudes of the respective first and second phase currents match with each other.Type: ApplicationFiled: December 29, 2016Publication date: July 13, 2017Applicant: DENSO CORPORATIONInventors: Yasuaki AOKI, Yosuke MATSUKI, Hideji YOSHIDA
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Patent number: 8829829Abstract: In a system, a superimposing element sets a command value vector of a high-frequency voltage signal and superimposes the high-frequency voltage signal with the command value vector on an output voltage of an inverter. The high-frequency voltage signal has a frequency higher than an electrical angular frequency of a rotary machine. The command value vector is correlated with a measured high-frequency component value of a current signal flowing in the rotary machine. A calculating element calculates a rotational angle of the rotary machine based on the measured high-frequency component value of the current signal flowing in the rotary machine. A reducing element controls at least one of the inverter and a direct voltage power supply to reduce a difference due to the dead time between the command value vector and a vector of a high-frequency voltage signal to be actually superimposed on the output voltage of the inverter.Type: GrantFiled: February 14, 2012Date of Patent: September 9, 2014Assignee: Denso CorporationInventors: Hiroko Yoneshima, Yasuaki Aoki, Hideji Yoshida
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Patent number: 8427088Abstract: In an apparatus, a predicting unit uses, as an initial value of a controlled variable, at least one of a first measured value of the controlled variable and a second measured value of a physical variable expressed as a function of the controlled variable. The predicting unit predicts, based on the initial value of the controlled variable, a value of the controlled variable when a driving mode of a switching element of a power converter is set. A driving unit has an integral element and determines, based on an output of the integral element to which a deviation between the predicted value of the controlled variable and a command value of the controlled variable is inputted, an actual driving mode of the switching element to thereby drive the switching element in the determined driving mode.Type: GrantFiled: July 8, 2010Date of Patent: April 23, 2013Assignees: Denso Corporation, Mie UniversityInventors: Akihiro Imura, Masami Fujitsuna, Hideji Yoshida, Muneaki Ishida, Tadanao Zanma
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Publication number: 20120206077Abstract: In a system, a superimposing element sets a command value vector of a high-frequency voltage signal and superimposes the high-frequency voltage signal with the command value vector on an output voltage of an inverter. The high-frequency voltage signal has a frequency higher than an electrical angular frequency of a rotary machine. The command value vector is correlated with a measured high-frequency component value of a current signal flowing in the rotary machine. A calculating element calculates a rotational angle of the rotary machine based on the measured high-frequency component value of the current signal flowing in the rotary machine. A reducing element controls at least one of the inverter and a direct voltage power supply to reduce a difference due to the dead time between the command value vector and a vector of a high-frequency voltage signal to be actually superimposed on the output voltage of the inverter.Type: ApplicationFiled: February 14, 2012Publication date: August 16, 2012Applicant: DENSO CORPORATIONInventors: Hiroko YONESHIMA, Yasuaki Aoki, Hideji Yoshida
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Patent number: 8106622Abstract: A control system aims at converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine. In the control system, a command voltage determiner determines a command voltage value for an alternating current voltage to be applied to the multiphase windings based on a zero crossing of a line-to-line current and a zero crossing of the amount of change in the line-to-line current. A driving unit drives the switching circuit on and off based on the determined command voltage value to thereby modulate the direct current voltage to the alternating current voltage to be applied to the multiphase windings.Type: GrantFiled: April 4, 2008Date of Patent: January 31, 2012Assignee: Denso CorporationInventors: Yasuaki Aoki, Hideji Yoshida
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Patent number: 7992400Abstract: A complex fluid machine has an expansion-compressor device, a pump, and a motor generator, wherein the expansion-compressor device, the pump, and the motor generator are operatively connected and arranged in series, and a power transmitting device for disconnecting the pump from the motor generator, when the expansion-compressor device is driven by the motor generator so as to be operated as a compressor device.Type: GrantFiled: March 27, 2008Date of Patent: August 9, 2011Assignees: DENSO CORPORATION, Nippon Soken, Inc.Inventors: Keiichi Uno, Hironori Asa, Yasuhiro Takeuchi, Hideji Yoshida, Akihiro Imura, Atsushi Inaba, Koichi Ban, Takashi Yamanaka, Shigeki Iwanami, Hiroshi Kishita, Hiroshi Ogawa
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Publication number: 20110006711Abstract: In an apparatus, a predicting unit uses, as an initial value of a controlled variable, at least one of a first measured value of the controlled variable and a second measured value of a physical variable expressed as a function of the controlled variable. The predicting unit predicts, based on the initial value of the controlled variable, a value of the controlled variable when a driving mode of a switching element of a power converter is set. A driving unit has an integral element and determines, based on an output of the integral element to which a deviation between the predicted value of the controlled variable and a command value of the controlled variable is inputted, an actual driving mode of the switching element to thereby drive the switching element in the determined driving mode.Type: ApplicationFiled: July 8, 2010Publication date: January 13, 2011Applicants: DENSO CORPORATION, MIE UNIVERSITYInventors: Akihiro Imura, Masami Fujitsuna, Hideji Yoshida, Muneaki Ishida, Tadanao Zanma
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Publication number: 20080246426Abstract: A control system aims at converting, via a switching circuit, a direct current voltage into an alternating current voltage to be applied to multiphase windings of a multiphase rotary machine to thereby control rotation of the multiphase rotary machine. In the control system, a command voltage determiner determines a command voltage value for an alternating current voltage to be applied to the multiphase windings based on a zero crossing of a line-to-line current and a zero crossing of the amount of change in the line-to-line current. A driving unit drives the switching circuit on and off based on the determined command voltage value to thereby modulate the direct current voltage to the alternating current voltage to be applied to the multiphase windings.Type: ApplicationFiled: April 4, 2008Publication date: October 9, 2008Applicant: DENSO CORPORATIONInventors: Yasuaki Aoki, Hideji Yoshida
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Patent number: 7418824Abstract: A complex fluid machine has an expansion-compressor device, a pump, and a motor generator, wherein the expansion-compressor device, the pump, and the motor generator are operatively connected and arranged in series, and a power transmitting device for disconnecting the pump from the motor generator, when the expansion-compressor device is driven by the motor generator so as to be operated as a compressor device.Type: GrantFiled: October 28, 2005Date of Patent: September 2, 2008Assignees: DENSO CORPORATION, Nippon Soken, Inc.Inventors: Keiichi Uno, Hironori Asa, Yasuhiro Takeuchi, Hideji Yoshida, Akihiro Imura, Atsushi Inaba, Koichi Ban, Takashi Yamanaka, Shigeki Iwanami, Hiroshi Kishita, Hiroshi Ogawa
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Publication number: 20080184706Abstract: A complex fluid machine has an expansion-compressor device, a pump, and a motor generator, wherein the expansion-compressor device, the pump, and the motor generator are operatively connected and arranged in series, and a power transmitting device for disconnecting the pump from the motor generator, when the expansion-compressor device is driven by the motor generator so as to be operated as a compressor device.Type: ApplicationFiled: March 27, 2008Publication date: August 7, 2008Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Keiichi Uno, Hironori Asa, Yasuhiro Takeuchi, Hideji Yoshida, Akihiro Imura, Atsushi Inaba, Hiroshi Kishita, Hiroshi Ogawa
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Patent number: 7181919Abstract: A waste heat energy recovery system has a refrigerant cycle and a Rankine cycle. When the cycle operation is changed from the refrigerant cycle to the Rankine cycle, an expansion device is started after the pump is started. When the cycle operation is changed from the Rankine cycle to the refrigerant cycle, the expansion device is stopped after the pump is stopped.Type: GrantFiled: March 22, 2005Date of Patent: February 27, 2007Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Keiichi Uno, Hironori Asa, Atsushi Inaba, Takashi Yamanaka, Hideji Yoshida, Hiroshi Ogawa
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Publication number: 20060107681Abstract: A complex fluid machine has an expansion-compressor device, a pump, and a motor generator, wherein the expansion-compressor device, the pump, and the motor generator are operatively connected and arranged in series, and a power transmitting device for disconnecting the pump from the motor generator, when the expansion-compressor device is driven by the motor generator so as to be operated as a compressor device.Type: ApplicationFiled: October 28, 2005Publication date: May 25, 2006Applicants: DENSO CORPORATION, NIPPON SOKEN, INC.Inventors: Keiichi Uno, Hironori Asa, Yasuhiro Takeuchi, Hideji Yoshida, Akihiro Imura, Atsushi Inaba, Koichi Ban, Takashi Yamanaka, Shigeki Iwanami, Hiroshi Kishita, Hiroshi Ogawa
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Patent number: 7026782Abstract: An apparatus is provided for controlling a synchronous motor. The apparatus comprises a first calculator calculating a voltage characteristic showing a characteristic of voltages to be applied to armature coils of a stator and a producer producing a command signal to provide the armature coils with the phase currents on the basis of the voltage characteristic. The apparatus still comprises a current detector detecting a signal depending on an amplitude of at least one of the phase currents, a second calculator calculating a rate of changes in a current amount indicating amplitudes of the phase currents, by using the signal from the current detector, and a feed-back member feed-backing the rate of changes in the current amount into the calculation of the voltage characteristic.Type: GrantFiled: July 14, 2005Date of Patent: April 11, 2006Assignee: Denso CorporationInventors: Yasuaki Aoki, Hideji Yoshida, Hiroshi Amano
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Publication number: 20060012329Abstract: An apparatus is provided for controlling a synchronous motor. The apparatus comprises a first calculator calculating a voltage characteristic showing a characteristic of voltages to be applied to armature coils of a stator and a producer producing a command signal to provide the armature coils with the phase currents on the basis of the voltage characteristic. The apparatus still comprises a current detector detecting a signal depending on an amplitude of at least one of the phase currents, a second calculator calculating a rate of changes in a current amount indicating amplitudes of the phase currents, by using the signal from the current detector, and a feed-back member feed-backing the rate of changes in the current amount into the calculation of the voltage characteristic.Type: ApplicationFiled: July 14, 2005Publication date: January 19, 2006Applicant: DENSO CORPORATIONInventors: Yasuaki Aoki, Hideji Yoshida, Hiroshi Amano
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Publication number: 20050217288Abstract: A waste heat energy recovery system has a refrigerant cycle and a Rankine cycle. When the cycle operation is changed from the refrigerant cycle to the Rankine cycle, an expansion device is started after the pump is started. When the cycle operation is changed from the Rankine cycle to the refrigerant cycle, the expansion device is stopped after the pump is stopped.Type: ApplicationFiled: March 22, 2005Publication date: October 6, 2005Inventors: Keiichi Uno, Hironori Asa, Atsushi Inaba, Takashi Yamanaka, Hideji Yoshida, Hiroshi Ogawa
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Patent number: 6799553Abstract: The variable valve timing controller controls the valve timing of the intake valve. The variable valve timing controller has a shaft, the stator fixed on the engine and generating the magnetic field around the shaft and rotational phase converter converting the torque applied to the shaft. When the valve timing is in the most delayed timing, the engine can be started. The rotational phase of this timing is called the feasible phase. When the stator stops generating the magnetic field, the load torque arise on the shaft. The rotational phase converter varies the rotational phase into the feasible phase with receiving the load torque from the shaft.Type: GrantFiled: March 26, 2004Date of Patent: October 5, 2004Assignees: Denso Corporation, Nippon Soken, Inc.Inventors: Akihiko Takenaka, Haruyuki Urushihata, Hideji Tani, Hideji Yoshida, Takayuki Inohara
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Publication number: 20040187819Abstract: The variable valve timing controller controls the valve timing of the intake valve. The variable valve timing controller has a shaft, the stator fixed on the engine and generating the magnetic field around the shaft and rotational phase converter converting the torque applied to the shaft. When the valve timing is in the most delayed timing, the engine can be started. The rotational phase of this timing is called the feasible phase. When the stator stops generating the magnetic field, the load torque arise on the shaft. The rotational phase converter varies the rotational phase into the feasible phase with receiving the load torque from the shaft.Type: ApplicationFiled: March 26, 2004Publication date: September 30, 2004Applicant: DENSO CORPORATION & NIPPON SOKEN, INC.Inventors: Akihiko Takenaka, Haruyuki Urushihata, Hideji Tani, Hideji Yoshida, Takayuki Inohara