Patents by Inventor Yoshinobu Takayanagi
Yoshinobu Takayanagi 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: 20220247210Abstract: An electromagnetic induction power generator includes a magnetic core attachable to a power transmission/distribution line, a power generating coil wound around the magnetic core, and a switching power supply circuit that converts AC appearing at both ends of the power generating coil into DC. The switching power supply circuit stops its switching operation based on a DC voltage level. The stop of the switching operation increases reactive power, allowing a stable power generating operation, i.e., a stable supply of active power irrespective of the amount of current flowing through the power transmission/distribution line. In addition, the amount of the reactive power can be finely adjusted based on the length of a period during which the switching operation is stopped, allowing a finer control of the reactive power.Type: ApplicationFiled: December 4, 2020Publication date: August 4, 2022Inventors: Yoshinobu TAKAYANAGI, Akihiro UNNO, Saiki SHIGEMORI
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Publication number: 20210384854Abstract: An electromagnetic induction power generator includes: a current transformer attached to a power transmission line; a rectifier circuit for rectifying an AC voltage output from the current transformer; and a regulator circuit for regulating a DC voltage output from the rectifier circuit. The current transformer has a magnetic core attached to the power transmission line serving as a primary winding and a secondary winding magnetically coupled to the power transmission line through the magnetic core. The magnetic core is configured to start to be magnetically saturated around the minimum value within the fluctuation range of a current flowing through the power transmission line.Type: ApplicationFiled: September 24, 2019Publication date: December 9, 2021Inventors: Yoshinobu TAKAYANAGI, Tetsuya CHIBA, Kazunori ISHIBASHI
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Publication number: 20140203901Abstract: To provide a small sized reactor with which it is possible to reduce the volume of a core and decrease electrical power losses. [Solution] A reactor has a first magnetic body and a pair of mutually insulated coils insulated from the first magnetic body while being arranged so as to surround the first magnetic body, and positively coupled to each other in response to a signal input between one end of each coil. The first magnetic body has a first and a second end portions, and the first and the second end portions are formed without directly facing each other via a space where the first magnetic body does not exist, and an output signal is output from between the other end of each of the pair of coils on the basis of the input signal input between the one end of each of the pair of coils.Type: ApplicationFiled: August 27, 2012Publication date: July 24, 2014Applicant: TDK CORPORATIONInventors: Toshio Chamura, Yoshinobu Takayanagi, Minoru Takahashi
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Patent number: 7800922Abstract: A switching power supply unit is provided, which can output a DC voltage and an AC voltage with a minimized installation space. A switching circuit is provided between a winding of a transformer and a main battery. A rectifier circuit is provided between other windings of the transformer and an accessory battery. Output terminals for outputting an AC output voltage are provided at the other side of the transformer, the AC output voltage being generated based on a DC input voltage inputted from the main battery. A DC output voltage and the AC output voltage are generated based on the DC input voltage, and then outputted. The transformer is shared by a generation path of the DC output voltage and a generation path of the AC output voltage. An AC voltage input section to be inputted with the AC input voltage from external equipment may be provided at the other side of the transformer.Type: GrantFiled: October 23, 2007Date of Patent: September 21, 2010Assignee: TDK CorporationInventors: Yoshinobu Takayanagi, Kunihiro Sato
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Patent number: 7796410Abstract: Provided is a switching power supply unit being able to perform voltage conversion between two DC power supplies, and perform appropriate charge operation based on an inputted AC voltage. When a main battery is preferentially charged, an SW control section performs control such that a duty ratio is fixed in switching operation of a switching circuit, and a duty ratio is variable in switching operation of a bidirectional switching circuit. On the other hand, when an accessory battery is preferentially charged, the SW control section performs control such that a duty ratio is variable in switching operation of each of the switching circuit and the bidirectional switching circuit. When the accessory battery is preferentially charged, the SW control section may perform control such that the duty ratio is fixed in switching operation of the switching circuit, and a duty ratio is variable in switching operation of a switching element.Type: GrantFiled: October 29, 2007Date of Patent: September 14, 2010Assignee: TDK CorporationInventors: Yoshinobu Takayanagi, Kunihiro Sato
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Patent number: 7764524Abstract: The present invention provides an inverter with a simple configuration capable of preventing occurrence of excessive rush current. A current detection circuit detects an AC output current flowing out from an output filter circuit. When the absolute value of the AC output current becomes equal to or larger than a threshold, a reset control unit and a drive pulse generation circuit control a DC/AC inverter so as to re-start operation after the AC output voltage becomes 0V. For example, even in the case where a capacitive load is connected during operation of the inverter or in the case where the load includes a standby circuit, excessive rush current is prevented.Type: GrantFiled: July 26, 2007Date of Patent: July 27, 2010Assignee: TDK CorporationInventor: Yoshinobu Takayanagi
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Patent number: 7764527Abstract: A switching power supply unit is provided, in which input terminals of an AC voltage can be made common to output terminals of an AC voltage. A first switching circuit is provided between a winding of a transformer and a main battery. A second switching circuit is provided between another winding of the transformer and input/output terminals. A third switching circuit is provided between the second switching circuit and the input/output terminals. Each of the first to third switching circuits includes a bidirectional switch (configured of a pair of one switching element and one diode connected in parallel to each other). A circuit for outputting an AC output voltage can be common to a circuit for inputting an AC input voltage to charge the main battery.Type: GrantFiled: February 15, 2008Date of Patent: July 27, 2010Assignee: TDK CorporationInventor: Yoshinobu Takayanagi
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Publication number: 20080198632Abstract: A switching power supply unit is provided, in which input terminals of an AC voltage can be made common to output terminals of an AC voltage. A first switching circuit is provided between a winding of a transformer and a main battery. A second switching circuit is provided between another winding of the transformer and input/output terminals. A third switching circuit is provided between the second switching circuit and the input/output terminals. Each of the first to third switching circuits includes a bidirectional switch (configured of a pair of one switching element and one diode connected in parallel to each other). A circuit for outputting an AC output voltage can be common to a circuit for inputting an AC input voltage to charge the main battery.Type: ApplicationFiled: February 15, 2008Publication date: August 21, 2008Applicant: TDK CORPORATIONInventor: Yoshinobu Takayanagi
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Publication number: 20080101096Abstract: Provided is a switching power supply unit being able to perform voltage conversion between two DC power supplies, and perform appropriate charge operation based on an inputted AC voltage. When a main battery is preferentially charged, an SW control section performs control such that a duty ratio is fixed in switching operation of a switching circuit, and a duty ratio is variable in switching operation of a bidirectional switching circuit. On the other hand, when an accessory battery is preferentially charged, the SW control section performs control such that a duty ratio is variable in switching operation of each of the switching circuit and the bidirectional switching circuit. When the accessory battery is preferentially charged, the SW control section may perform control such that the duty ratio is fixed in switching operation of the switching circuit, and a duty ratio is variable in switching operation of a switching element.Type: ApplicationFiled: October 29, 2007Publication date: May 1, 2008Applicant: TDK CORPORATIONInventors: Yoshinobu Takayanagi, Kunihiro Sato
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Publication number: 20080094859Abstract: A switching power supply unit is provided, which can output a DC voltage and an AC voltage with a minimized installation space. A switching circuit is provided between a winding of a transformer and a main battery. A rectifier circuit is provided between other windings of the transformer and an accessory battery. Output terminals for outputting an AC output voltage are provided at the other side of the transformer, the AC output voltage being generated based on a DC input voltage inputted from the main battery. A DC output voltage and the AC output voltage are generated based on the DC input voltage, and then outputted. The transformer is shared by a generation path of the DC output voltage and a generation path of the AC output voltage. An AC voltage input section to be inputted with the AC input voltage from external equipment may be provided at the other side of the transformer.Type: ApplicationFiled: October 23, 2007Publication date: April 24, 2008Applicant: TDK CORPORATIONInventors: Yoshinobu Takayanagi, Kunihiro Sato
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Publication number: 20080049467Abstract: The present invention provides an inverter with a simple configuration capable of preventing occurrence of excessive rush current. A current detection circuit detects an AC output current flowing out from an output filter circuit. When the absolute value of the AC output current becomes equal to or larger than a threshold, a reset control unit and a drive pulse generation circuit control a DC/AC inverter so as to re-start operation after the AC output voltage becomes 0V. For example, even in the case where a capacitive load is connected during operation of the inverter or in the case where the load includes a standby circuit, excessive rush current is prevented.Type: ApplicationFiled: July 26, 2007Publication date: February 28, 2008Applicant: TDK CORPORATIONInventor: Yoshinobu Takayanagi
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Patent number: 6614667Abstract: A power conversion apparatus capable of reducing the conduction loss to achieve high efficiency yielding a downsized and weight-reduced apparatus and a method for driving such a power conversion apparatus is disclosed. A power conversion apparatus comprising a switching-element driving circuit which includes a current transformer having a primary coil connected to an current control type switching element, and a driving-current generating circuit formed of a secondary coil of the current transformer and a rectifying circuit connected to the secondary coil, wherein an output current generated in the driving-current generating circuit is supplied to the switching element as a driving current of the switching element, and a method for driving the switching element of such a power conversion apparatus are disclosed.Type: GrantFiled: April 23, 2001Date of Patent: September 2, 2003Assignee: TDK CorporationInventors: Kazuyuki Itoh, Yoshihisa Okita, Katsuaki Tanaka, Yoshinobu Takayanagi
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Patent number: 6414854Abstract: In a power conversion apparatus using a semiconductor switching element, a collector-emitter voltage detecting device is provided to detect the collector-emitter voltage in the semiconductor switching element in the power conversion apparatus in order to comprehensively reduce switching loss and conduction loss arising in a switching element. A base current supplied to the switching element is controlled based on the detected collector-emitter voltage so as to control the collector-emitter voltage or control a regenerative power to be transmitted from a switching element driving power supply to an external auxiliary power supply or the like. This provides an optimum driving in consideration of factors including dispersion in a specific current amplification factor (hfe) of the switching element, variance in the hfe caused by temperature, and variance in the hfe to a current flowing through the switching element, for reducing a sum of conduction loss and driving power of the switching element.Type: GrantFiled: September 7, 2001Date of Patent: July 2, 2002Assignee: TDK CorporationInventors: Kazuyuki Itoh, Yoshihisa Okita, Katsuaki Tanaka, Yoshinobu Takayanagi
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Publication number: 20020012253Abstract: In a power conversion apparatus using a semiconductor switching element, a collector-emitter voltage detecting device is provided to detect the collector-emitter voltage in the semiconductor switching element in the power conversion apparatus in order to comprehensively reduce switching loss and conduction loss arising in a switching element. A base current supplied to the switching element is controlled based on the detected collector-emitter voltage so as to control the collector-emitter voltage or control a regenerative power to be transmitted from a switching element driving power supply to an external auxiliary power supply or the like. This provides an optimum driving in consideration of factors including dispersion in a specific current amplification factor (hfe) of the switching element, variance in the hfe caused by temperature, and variance in the hfe to a current flowing through the switching element, for reducing a sum of conduction loss and driving power of the switching element.Type: ApplicationFiled: September 7, 2001Publication date: January 31, 2002Inventors: Kazuyuki Itoh, Yoshihisa Okita, Katsuaki Tanaka, Yoshinobu Takayanagi