Patents by Inventor Keiichi Yoshisaka
Keiichi Yoshisaka 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: 8385095Abstract: An increase in a ripple voltage of a capacitor in a smoothing circuit is prevented to achieve a compact capacitor and cost reduction for capacitors in an electric power supply circuit which performs PAM control using a switching element. An electric power supply circuit includes a bridge circuit for rectifying alternating current power, a smoothing circuit which has two capacitors serially connected to each other, and a PAM control section for turning a switching element on and off at a predetermined timing. The PAM control section includes a phase difference detection section which detects a phase shift of a PAM waveform based on a change in a voltage difference between the two capacitors, and a phase correction section which corrects the phase of the PAM waveform so that an input current has a sine waveform.Type: GrantFiled: March 31, 2008Date of Patent: February 26, 2013Assignee: Daikin Industries, Ltd.Inventors: Ryou Nakamoto, Masafumi Hashimoto, Keisuke Shimatani, Keiichi Yoshisaka, Masakazu Katou
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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: 8270187Abstract: An electric power supply circuit includes a switching element (S) for causing a short-circuit for output power of a diode bridge circuit (12), a zero-cross detector section (5a) for detecting a point at which an input voltage reaches a level equal to or lower than a reference level, a timer section (5d) for starting a count upon the detection by the zero-cross detector section (5a), and a PAM waveform output section (5c) for causing the switching element (S) to perform switching with a predetermined output timing so that a waveform of the input current is caused to approximate to a sine wave. The circuit further includes a correction section (5e) for correcting, when a difference between a detection interval from detection to detection by the zero-cross detector section (5a), and an average value for detection intervals up to current detection occurs, an initial value of the count of the timer section (5d) according to the difference.Type: GrantFiled: March 18, 2008Date of Patent: September 18, 2012Assignee: Daikin Industries, Ltd.Inventors: Ryou Nakamoto, Masafumi Hashimoto, Keisuke Shimatani, Keiichi Yoshisaka, Masakazu Katou
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Patent number: 8218342Abstract: The power supply device according to the present invention converts alternating-current power into direct-current power, and supplies the direct-current power to a load. Further, the power supply device includes a buffer, a control section, a rectifier circuit, a smoothing circuit, and a switch. After a predetermined zero cross point is detected, the control section uses in common, over a predetermined period of the alternating-current power, predetermined parameters retained in the buffer in calculating a timing at which a PAM interrupt pulse is generated.Type: GrantFiled: March 17, 2008Date of Patent: July 10, 2012Assignee: Daikin Industries, Ltd.Inventors: Masakazu Katou, Ryou Nakamoto, Keisuke Shimatani, Keiichi Yoshisaka, Masafumi Hashimoto
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Patent number: 8102686Abstract: An electric power supply circuit includes a diode bridge circuit (12) for rectifying an alternating current, a switching element (S) for causing a short-circuit for output power of the diode bridge circuit (12), and a PAM control section (15) for causing the switching element (S) to perform switching with a predetermined timing so that a waveform of an input current approximates to a sine wave. The PAM control section (15) outputs ON/OFF pulses so that five pulses are output for each zero-cross point and one of the five pulses located in center extends over the zero-cross point at any time.Type: GrantFiled: March 18, 2008Date of Patent: January 24, 2012Assignee: Daikin Industries, Ltd.Inventors: Masakazu Katou, Ryou Nakamoto, Keisuke Shimatani, Keiichi Yoshisaka, Masafumi Hashimoto
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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: 20100073977Abstract: An increase in a ripple voltage of a capacitor in a smoothing circuit is prevented to achieve a compact capacitor and cost reduction for capacitors in an electric power supply circuit which performs PAM control using a switching element. An electric power supply circuit includes a bridge circuit (12) for rectifying alternating current power, a smoothing circuit (13) which has two capacitors (C1 and C2) serially connected to each other, and a PAM control section (15) for turning a switching element (S) on and off at a predetermined timing. The PAM control section (15) includes a phase difference detection section (15d) which detects a phase shift of a PAM waveform based on a change in a voltage difference between the two capacitors (C1 and C2), and a phase correction section (15e) which corrects the phase of the PAM waveform so that an input current has a sine waveform.Type: ApplicationFiled: March 31, 2008Publication date: March 25, 2010Applicant: Daikin Industries, Ltd.Inventors: Ryou Nakamoto, Masafumi Hashimoto, Keisuke Shimatani, Keiichi Yoshisaka, Masakazu Katou
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Publication number: 20100061128Abstract: An electric power supply circuit includes a switching element (S) for causing a short-circuit for output power of a diode bridge circuit (12), a zero-cross detector section (5a) for detecting a point at which an input voltage reaches a level equal to or lower than a reference level, a timer section (5d) for starting a count upon the detection by the zero-cross detector section (5a), and a PAM waveform output section (5c) for causing the switching element (S) to perform switching with a predetermined output timing so that a waveform of the input current is caused to approximate to a sine wave. The circuit further includes a correction section (5e) for correcting, when a difference between a detection interval from detection to detection by the zero-cross detector section (5a), and an average value for detection intervals up to current detection occurs, an initial value of the count of the timer section (5d) according to the difference.Type: ApplicationFiled: March 18, 2008Publication date: March 11, 2010Inventors: Ryou Nakamoto, Masafumi Hashimoto, Keisuke Shimatani, Keiichi Yoshisaka, Masakazu Katou
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Publication number: 20100061127Abstract: The power supply device according to the present invention converts alternating-current power into direct-current power, and supplies the direct-current power to a load. Further, the power supply device includes a buffer, a control section, a rectifier circuit, a smoothing circuit, and a switch. After a predetermined zero cross point is detected, the control section uses in common, over a predetermined period of the alternating-current power, predetermined parameters retained in the buffer in calculating a timing at which a PAM interrupt pulse is generated.Type: ApplicationFiled: March 17, 2008Publication date: March 11, 2010Inventors: Masakazu Katou, Ryou Nakamoto, Keisuke Shimatani, Keiichi Yoshisaka, Masafumi Hashimoto
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Publication number: 20100014334Abstract: An electric power supply circuit includes a diode bridge circuit (12) for rectifying an alternating current, a switching element (S) for causing a short-circuit for output power of the diode bridge circuit (12), and a PAM control section (15) for causing the switching element (S) to perform switching with a predetermined timing so that a waveform of an input current approximates to a sine wave. The PAM control section (15) outputs ON/OFF pulses so that five pulses are output for each zero-cross point and one of the five pulses located in center extends over the zero-cross point at any time.Type: ApplicationFiled: March 18, 2008Publication date: January 21, 2010Inventors: Masakazu Katou, Ryou Nakamoto, Keisuke Shimatani, Keiichi Yoshisaka, Masafumi Hashimoto
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Publication number: 20070271411Abstract: An object of the present invention is to provide a technique capable of assembling a device in both of a first device performing a first function with a predetermined part and a second device performing a second function without a second part, and instructing each of the first and second functions. Determining means (92) determines the presence or absence of an electronic expansion valve (91) and gives the result to a central processing unit (93). The central processing unit (93) allows a gate array (94) operate and instruct a first function including a function of performing communication between a communication network (83) and an indoor unit (92a). When there is no electronic expansion valve (EV), the determining means (92) sends a result of the determination result indicative of the absence to the central processing unit (93). The central processing unit (93) instructs a second function of making the gate array (94) inoperative.Type: ApplicationFiled: July 25, 2007Publication date: November 22, 2007Inventors: Toshinori Ushio, Keiichi Yoshisaka, Mitsuhiko Yamamoto, Masaaki Yokoi
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Patent number: 7257954Abstract: An object of the present invention is to provide a technique capable of assembling a device in both of a first device performing a first function with a predetermined part and a second device performing a second function without a second part, and instructing each of the first and second functions. Determining means (92) determines the presence or absence of an electronic expansion valve (91) and gives the result to a central processing unit (93). The central processing unit (93) allows a gate array (94) operate and instruct a first function including a function of performing communication between a communication network (83) and an indoor unit (92a). When there is no electronic expansion valve (EV), the determining means (92) sends a result of the determination result indicative of the absence to the central processing unit (93). The central processing unit (93) instructs a second function of making the gate array (94) inoperative.Type: GrantFiled: September 24, 2002Date of Patent: August 21, 2007Assignee: Daikin Industries, Ltd.Inventors: Toshinori Ushio, Keiichi Yoshisaka, Mitsuhiko Yamamoto, Masaaki Yokoi
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Publication number: 20040233766Abstract: An object of the present invention is to provide a technique capable of assembling a device in both of a first device performing a first function with a predetermined part and a second device performing a second function without a second part, and instructing each of the first and second functions. Determining means (92) determines the presence or absence of an electronic expansion valve (91) and gives the result to a central processing unit (93). The central processing unit (93) allows a gate array (94) operate and instruct a first function including a function of performing communication between a communication network (83) and an indoor unit (92a). When there is no electronic expansion valve (EV), the determining means (92) sends a result of the determination result indicative of the absence to the central processing unit (93). The central processing unit (93) instructs a second function of making the gate array (94) inoperative.Type: ApplicationFiled: March 10, 2004Publication date: November 25, 2004Inventors: Toshinori Ushio, Keiichi Yoshisaka, Mitsuhiko Yamamoto, Masaaki Yokoi
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Patent number: 5400017Abstract: A transmission device is disclosed wherein a plurality of control units each having a transmitting/receiving block connected to one another through a positive signal line and a negative signal line, and bidirectional signal transmission is carried out with a predetermined polarity among the control units. The signal lines of the transmission device are connected to a power superposing source for applying a predetermined DC voltage to the signal lines and each of the control units include a signal switch connected to the transmitting/receiving block for inverting and switching a transmission signal sent or received by the transmitting/receiving block, and a polarity judging device adapted to supply a homopolar signal when the potential of the positive signal line is higher than the potential of the negative signal line, and adapted to supply a heteropolar signal when the potential of the positive signal line is lower than the potential of the negative signal line.Type: GrantFiled: December 18, 1992Date of Patent: March 21, 1995Assignee: Daikin Industries, Ltd.Inventors: Keiichi Yoshisaka, Kouji Uchida, Kiyoshi Shima, Masaharu Sogabe
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Patent number: 5390506Abstract: An air condition control unit is provided with an EEPROM previously memorizing respectively different specific numbers of indoor control units and power supply means. Further provided thereto are power supply judging means for judging whether a remote controller receives the power from another indoor control unit by monitoring power source lines, and power not-supply determining means for determining the unit of its own to be a unit which does not supply the power to the remote controller when the power supply judging means judges the remote controller receives the power.Type: GrantFiled: July 30, 1993Date of Patent: February 21, 1995Assignee: Daikin Industries, Ltd.Inventors: Masaharu Sogabe, Kiyoshi Shima, Keiichi Yoshisaka, Hisashi Sumida