Patents by Inventor Hirotaka Saruwatari
Hirotaka Saruwatari 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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Publication number: 20230261601Abstract: A power conversion system includes an inverter circuit, a harmonic reducer, and a synchronizer. The inverter circuit is operable with electric power supplied from an alternating-current power source. The harmonic reducer is connected to the alternating-current power source. The inverter circuit includes a circuit main portion and a conversion control unit configured to control the circuit main portion. The harmonic reducer includes a current control unit configured to perform control to reduce a harmonic current flowing to the alternating-current power source. The synchronizer is configured to synchronize a state of the harmonic reducer with a state of the inverter circuit.Type: ApplicationFiled: April 18, 2023Publication date: August 17, 2023Inventors: Reiji KAWASHIMA, Koudai OKUZONO, Keisuke OHTA, Masaki KONO, Masahide FUJIWARA, Yuu YOSHIKAWA, Hirotaka SARUWATARI
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Patent number: 8988836Abstract: When an abnormality occurs in a refrigeration cycle, the inverter motor provided in the air conditioner is stopped reliably and contacts of the main relay are prevented from degradation and fusion. A power circuit 1 of the air conditioner includes a rectifier circuit RC, a capacitor C (smoothing unit), a main relay 10 provided on a current path between the rectifier circuit RC and the capacitor C, an inverter circuit 30, a microcomputer 100, and a delay circuit 40. The microcomputer 100 has an inverter circuit control unit 110, a main relay opening/closing control unit 120, a waveform forced cut-off unit 130, and a cut-off signal output unit 140.Type: GrantFiled: March 18, 2010Date of Patent: March 24, 2015Assignee: Daikin Industries, Ltd.Inventors: Hirotaka Saruwatari, Yuuko Nakashita, Nobuyasu Hiraoka, Satoshi Yagi, Hirotaka Doi, Keisuke Shimatani
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Patent number: 8305780Abstract: The invention relates to a power conversion apparatus including a converter circuit and an inverter circuit. The invention allows more precise output control of the inverter circuit than a power conversion apparatus in which the output control is performed based on a current value only, thereby improving operation efficiency. A current sensor detects input current of the inverter circuit, and a voltage sensor detects input voltage of the inverter circuit. A power value calculator section in an inverter microcomputer obtains a power value based on the input current and the input voltage. The inverter microcomputer and the control microcomputer perform droop control of reducing the output of the inverter circuit to make the power value smaller than a predetermined power value.Type: GrantFiled: March 2, 2009Date of Patent: November 6, 2012Assignee: Daikin Industries, Ltd.Inventors: Hirotaka Saruwatari, Takeshi Kokura, Keisuke Shimatani, Keiichi Yoshisaka
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Patent number: 8121735Abstract: A control device is configured to control an air conditioner that includes an air conditioner outdoor unit and an air conditioner indoor unit. The control device includes a microcomputer and a storage element. The microcomputer causes a signal to be transmitted and received between an outdoor communication unit of the air conditioner outdoor unit and an indoor communication unit of the air conditioner indoor unit. The storage element stores specific information in response to command from the microcomputer. The microcomputer causes the storage element to store operation information including a state of transmission and reception of the signal of the air conditioner at a constant time interval.Type: GrantFiled: July 2, 2007Date of Patent: February 21, 2012Assignee: Daikin Industries, Ltd.Inventors: Hirotaka Saruwatari, Hiroyuki Matsuura, Mario Hayashi
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Publication number: 20120033334Abstract: When an abnormality occurs in a refrigeration cycle, the inverter motor provided in the air conditioner is stopped reliably and contacts of the main relay are prevented from degradation and fusion. A power circuit 1 of the air conditioner includes a rectifier circuit RC, a capacitor C (smoothing unit), a main relay 10 provided on a current path between the rectifier circuit RC and the capacitor C, an inverter circuit 30, a microcomputer 100, and a delay circuit 40. The microcomputer 100 has an inverter circuit control unit 110, a main relay opening/closing control unit 120, a waveform forced cut-off unit 130, and a cut-off signal output unit 140.Type: ApplicationFiled: March 18, 2010Publication date: February 9, 2012Inventors: Hirotaka Saruwatari, Yuuko Nakashita, Nobuyasu Hiraoka, Satoshi Yagi, Hirotaka Doi, Keisuke Shimatani
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Patent number: 8109103Abstract: After the power source to the control substrate is turned on, power is supplied to the compressor driver and the fan driver. Then, when it is determined that an indoor unit is in operation, the compressor driver and the fan driver are operated. Meanwhile, when it is determined that the indoor unit is not in operation, after the lapse of ten minutes or twenty minutes under a predetermined setting, the power to the compressor driver and the fan driver is cut. When the operation of the indoor unit is started again, power is supplied to the compressor driver and the fan driver.Type: GrantFiled: March 2, 2007Date of Patent: February 7, 2012Assignee: Daikin Industries, Ltd.Inventors: Morikuni Natsume, Satoshi Yagi, Takuya Kotani, Yasuaki Miyaba, Hirotaka Saruwatari, Hiroyuki Matsuura, Mario Hayashi
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Patent number: 8033125Abstract: A control device includes a microcomputer and a storage element. The microcomputer is configured to execute an inspection operation mode in which an air conditioner is operated in inspection process in a manufacturing site, and a normal operation mode in which the air conditioner is operated at an installation site. When the operation state of the air conditioner fails to satisfy predetermined conditions, the microcomputer is configured to confirm that there is an error, and abnormally stop the air conditioner. When the air conditioner is abnormally stopped, the microcomputer is configured to cause the storage element to store predetermined operation information obtained during a period until abnormal stoppage of the air conditioner and to store the operation mode being executed at the time of occurrence of the error in the air conditioner.Type: GrantFiled: July 4, 2007Date of Patent: October 11, 2011Assignee: Daikin Industries, Ltd.Inventors: Hirotaka Saruwatari, Hiroyuki Matsuura, Mario Hayashi
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Patent number: 8024939Abstract: An outdoor unit includes an outdoor unit control circuit, an inverter substrate and a compressor. Periodic communication showing the operating condition of the inverter substrate is set from the inverter substrate to the outdoor unit control circuit. Thus, when the communication is performed normally, the drive of the compressor is changed to a power saving process according to the necessity of the power consumption and the operating condition of the inverter substrate. When the communication is defective, the power-on reset is done to the inverter substrate.Type: GrantFiled: February 1, 2007Date of Patent: September 27, 2011Assignee: Daikin Industries, Ltd.Inventors: Satoshi Yagi, Hisashi Sumida, Hirotaka Saruwatari, Hiroyuki Matsuura, Mario Hayashi
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Publication number: 20110026280Abstract: The invention relates to a power conversion apparatus including a converter circuit and an inverter circuit. The invention allows more precise output control of the inverter circuit than a power conversion apparatus in which the output control is performed based on a current value only, thereby improving operation efficiency. A current sensor detects input current of the inverter circuit, and a voltage sensor detects input voltage of the inverter circuit. A power value calculator section in an inverter microcomputer obtains a power value based on the input current and the input voltage. The inverter microcomputer and the control microcomputer perform droop control of reducing the output of the inverter circuit to make the power value smaller than a predetermined power value.Type: ApplicationFiled: March 2, 2009Publication date: February 3, 2011Applicant: Daikin Industries, Ltd.Inventors: Hirotaka Saruwatari, Takeshi Kokura, Keisuke Shimatani, Keiichi Yoshisaka
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Publication number: 20090320507Abstract: A control device includes a microcomputer and a storage element. The microcomputer is configured to execute an inspection operation mode in which an air conditioner is operated in inspection process in a manufacturing site, and a normal operation mode in which the air conditioner is operated at an installation site. When the operation state of the air conditioner fails to satisfy predetermined conditions, the microcomputer is configured to confirm that there is an error, and abnormally stop the air conditioner. When the air conditioner is abnormally stopped, the microcomputer is configured to cause the storage element to store predetermined operation information obtained during a period until abnormal stoppage of the air conditioner and to store the operation mode being executed at the time of occurrence of the error in the air conditioner.Type: ApplicationFiled: July 4, 2007Publication date: December 31, 2009Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka Saruwatari, Hiroyuki Matsuura, Mario Hayashi
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Publication number: 20090281666Abstract: A control device is configured to control an air conditioner that includes an air conditioner outdoor unit and an air conditioner indoor unit. The control device includes a microcomputer and a storage element. The microcomputer causes a signal to be transmitted and received between an outdoor communication unit of the air conditioner outdoor unit and an indoor communication unit of the air conditioner indoor unit. The storage element stores specific information in response to command from the microcomputer. The microcomputer causes the storage element to store operation information including a state of transmission and reception of the signal of the air conditioner at a constant time interval.Type: ApplicationFiled: July 2, 2007Publication date: November 12, 2009Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka Saruwatari, Hiroyuki Matsuura, Mario Hayashi
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Publication number: 20090145145Abstract: An air conditioner preferably includes a selection component (switch) and an air conditioning data acquisition/processing component (printed wiring board). Preferably, a storage component (EEPROM) records at least two sets of data of whether or not an option function is being executed and a drive condition of a compressor relating to air conditioning that the printed wiring board acquires. The switch receives display setting data indicating either one of the two sets of data. The printed wiring board includes an output port that alternatively outputs one of the data of whether or not the option function is being executed and the data of the drive condition of the compressor, and the printed wiring board performs data output processing from the output port in accordance with the display setting data that the switch has received.Type: ApplicationFiled: June 7, 2007Publication date: June 11, 2009Applicant: DAIKIN INDUSTRIES, LTD.Inventors: Hirotaka Saruwatari, Hiroyuki Matsuura, Mario Hayashi
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Publication number: 20090038325Abstract: An outdoor unit includes an outdoor unit control circuit, an inverter substrate and a compressor. Periodic communication showing the operating condition of the inverter substrate is set from the inverter substrate to the outdoor unit control circuit. Thus, when the communication is performed-normally, the drive of the compressor is changed to a power saving process according to the necessity of the power consumption and the operating condition of the inverter substrate. When the communication is defective, the power-on reset is done to the inverter substrate.Type: ApplicationFiled: January 1, 2007Publication date: February 12, 2009Inventors: Satoshi Yagi, Hisashi Sumida, Hirotaka Saruwatari, Hiroyuki Matsuura, Mario Hayashi
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Publication number: 20090007579Abstract: After the power source to the control substrate is turned on, power is supplied to the compressor driver and the fan driver. Then, when it is determined that an indoor unit is in operation, the compressor driver and the fan driver are operated. Meanwhile, when it is determined that the indoor unit is not in operation, after the lapse of ten minutes or twenty minutes under a predetermined setting, the power to the compressor driver and the fan driver is cut. When the operation of the indoor unit is started again, power is supplied to the compressor driver and the fan driver.Type: ApplicationFiled: March 2, 2007Publication date: January 8, 2009Inventors: Morikuni Natsume, Satoshi Yagi, Takuya Kotani, Yasuaki Miyaba, Hirotaka Saruwatari, Hiroyuki Matsuura, Mario Hayashi