Patents by Inventor Katsuhiro Furukawa
Katsuhiro Furukawa 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: 7522692Abstract: A communication system is provided including a transceiver and an application controller to transmit and receive signals through the transceiver. An isolator which insulates and separates the transceiver and application controller includes primary and secondary side circuits insulated from each other on a substrate and a capacitive insulating means to transfer signals between the primary and second sides while insulating and separating the primary side circuit from the secondary side circuit.Type: GrantFiled: March 7, 2007Date of Patent: April 21, 2009Assignee: Hitachi, Ltd.Inventors: Seigoh Yukutake, Yasuyuki Kojima, Minehiro Nemoto, Masatsugu Amishiro, Takayuki Iwasaki, Shinichiro Mitani, Katsuhiro Furukawa, Chiyoshi Kamada, Atsuo Watanabe, Takayuki Oouchi, Nobuyasu Kanekawa
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Patent number: 7289553Abstract: A communication system is provided including a transceiver and an application controller to transmit and receive signals through the transceiver. An isolator which insulates and separates the transceiver and application controller includes primary and secondary side circuits insulated from each other on a substrate and a capacitive insulating means to transfer signals between the primary and second sides while insulating and separating the primary side circuit from the secondary side circuit.Type: GrantFiled: March 4, 2003Date of Patent: October 30, 2007Assignee: Hitachi, Ltd.Inventors: Seigoh Yukutake, Yasuyuki Kojima, Minehiro Nemoto, Masatsugu Amishiro, Takayuki Iwasaki, Shinichiro Mitani, Katsuhiro Furukawa, Chiyoshi Kamada, Atsuo Watanabe, Takayuki Oouchi, Nobuyasu Kanekawa
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Publication number: 20070153886Abstract: A communication system is provided including a transceiver and an application controller to transmit and receive signals through the transceiver. An isolator which insulates and separates the transceiver and application controller includes primary and secondary side circuits insulated from each other on a substrate and a capacitive insulating means to transfer signals between the primary and second sides while insulating and separating the primary side circuit from the secondary side circuit.Type: ApplicationFiled: March 7, 2007Publication date: July 5, 2007Inventors: Seigoh Yukutake, Yasuyuki Kojima, Minehiro Nemoto, Masatsugu Amishiro, Takayuki Iwasaki, Shinichiro Mitani, Katsuhiro Furukawa, Chiyoshi Kamada, Atsuo Watanabe, Takayuki Oouchi, Nobuyasu Kanekawa
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Patent number: 7116709Abstract: The code system is realized by that a plurality of waveforms A and B each having duty ratios of 50% in which only any one of a rising edge and a falling edge is present are combined with each other, and “1” and “0” are allocated to the combined waveform. In accordance with the present invention, both a clock and data can be transmitted at the same time, and can be readily demodulated without using a complex PLL circuit. As a trial manufacture according to the present invention, the demodulator could be realized which could allow variations contained in an input frequency by more than 1 digit under operating voltage of 2 V. The effectiveness of this patent could be confirmed.Type: GrantFiled: June 4, 2004Date of Patent: October 3, 2006Assignee: Hitachi, Ltd.Inventors: Satoshi Tanaka, Tomoaki Ishifuji, Kenji Nagai, Katsuhiro Furukawa
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Publication number: 20040228400Abstract: The code system is realized by that a plurality of waveforms A and B each having duty ratios of 50% in which only any one of a rising edge and a falling edge is present are combined with each other, and “1” and “0” are allocated to the combined waveform. In accordance with the present invention, both a clock and data can be transmitted at the same time, and can be readily demodulated without using a complex PLL circuit. As a trial manufacture according to the present invention, the demodulator could be realized which could allow variations contained in an input frequency by more than 1 digit under operating voltage of 2 V. The effectiveness of this patent could be confirmed.Type: ApplicationFiled: June 4, 2004Publication date: November 18, 2004Applicant: Hitachi, Ltd.Inventors: Satoshi Tanaka, Tomoaki Ishifuji, Kenji Nagai, Katsuhiro Furukawa
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Patent number: 6765959Abstract: The code system is realized by that a plurality of waveforms A and B each having duty ratios of 50% in which only any one of a rising edge and a falling edge is present are combined with each other, and “1” and “0” are allocated to the combined waveform. In accordance with the present invention, both a clock and data can be transmitted at the same time, and can be readily demodulated without using a complex PLL circuit. As a trial manufacture according to the present invention, the demodulator could be realized which could allow variations contained in an input frequency by more than 1 digit under operating voltage of 2 V. The effectiveness of this patent could be confirmed.Type: GrantFiled: June 4, 1999Date of Patent: July 20, 2004Assignee: Hitachi, Ltd.Inventors: Satoshi Tanaka, Tomoaki Ishifuji, Kenji Nagai, Katsuhiro Furukawa
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Publication number: 20030169808Abstract: A communication system is provided including a transceiver and an application controller to transmit and receive signals through the transceiver. An isolator which insulates and separates the transceiver and application controller includes primary and secondary side circuits insulated from each other on a substrate and a capacitive insulating means to transfer signals between the primary and second sides while insulating and separating the primary side circuit from the secondary side circuit.Type: ApplicationFiled: March 4, 2003Publication date: September 11, 2003Inventors: Seigoh Yukutake, Yasuyuki Kojima, Minehiro Nemoto, Masatsugu Amishiro, Takayuki Iwasaki, Shinichiro Mitani, Katsuhiro Furukawa, Chiyoshi Kamada, Atsuo Watanabe, Takayuki Oouchi, Nobuyasu Kanekawa
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Patent number: 6603807Abstract: An isolator is made monolithic by forming a capacitive insulating barrier using an interlayer insulation film on the semiconductor substrate to miniaturize the modem device by the monolithic isolator.Type: GrantFiled: February 26, 1999Date of Patent: August 5, 2003Assignee: Hitachi, Ltd.Inventors: Seigoh Yukutake, Yasuyuki Kojima, Minehiro Nemoto, Masatsugu Amishiro, Takayuki Iwasaki, Shinichiro Mitani, Katsuhiro Furukawa, Chiyoshi Kamada, Atsuo Watanabe, Takayuki Oouchi, Nobuyasu Kanekawa
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Patent number: 6476750Abstract: The hardware of an over-sampling A/D and D/A converter is provided, which hardware is capable of being operated with either kind of software: one corresponding to a first method in which the over-sampling ratio is fixed and the other corresponding to a second method in which the over-sampling ratio is variable. The value N3 written on the pseudo-frequency-dividing-ratio-register 11 and the value N4 written on the pseudo-over-sampling-ratio-register 21 are converted through a user interface into the frequency dividing ratio N1 by the conversion circuit 12 and the converted result is written in the frequency-dividing-ratio-register 10.Type: GrantFiled: February 9, 2000Date of Patent: November 5, 2002Assignee: Hitachi, Ltd.Inventors: Nobuyasu Kanekawa, Yasuyuki Kojima, Seigou Yukutake, Minehiro Nemoto, Kazuhisa Takami, Takayuki Iwasaki, Yusuke Takeuchi, Katsuhiro Furukawa
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Patent number: 6407432Abstract: A small sized semiconductor device having a high insulating performance between a primary side circuit and a secondary side circuit is realized. A circuit region 2, plural first and second terminal electrodes 5 connected to the circuit region 3, and an insulation-separation region 4 for separating electrically the first terminal electrodes from the second terminal electrodes, and for transmitting signals between the first and the second terminal electrodes are formed onto a semiconductor chip 1, and the insulation-separation region 4 is provided between the first and second terminal electrodes. The interval between the first and the second terminal electrodes on the same semiconductor chip can be separated with high insulating performance.Type: GrantFiled: December 29, 1999Date of Patent: June 18, 2002Assignee: Hitachi, Ltd.Inventors: Minehiro Nemoto, Yasuyuki Kojima, Nobuyasu Kanekawa, Seigou Yukutake, Katsuhiro Furukawa
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Patent number: 6130577Abstract: In a digital demodulator for phase modulated signals, logical values of a waveform-shaped phase-modulated signal are sampled based on a clock signal having a period that stands in integer ratio relationship to a carrier period of the modulated signal and thereafter subjected to serial/parallel conversion for each predetermined interval, whereby a logical pattern of a digital code train subjected to the serial/parallel conversion is analyzed. As a result, phase information required to demodulate digital data can be logically detected.Type: GrantFiled: April 2, 1998Date of Patent: October 10, 2000Assignees: Hitachi, Ltd., Hitachi Tohbu Semiconductor, Ltd.Inventors: Yuko Tamba, Taiji Kondou, Katsuhiro Furukawa, Yukihito Ishihara
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Patent number: 5406218Abstract: A demodulation circuit comprises: a phase detection circuit for determining an absolute value of a phase difference between an input signal to be demodulated and a reference signal; a binary phase detection circuit for converting a phase lead or lag between the input signal and the reference signal into a sign of phase difference; and a phase demodulation circuit for calculating, from the absolute value and the sign of phase difference, a phase difference quantity between the input signal and the reference signal and for performing a delay detection on the phase difference quantity; wherein the binary phase detection circuit includes a delay circuit which generates a delay time corresponding to the operation delay of the phase detection circuit; and wherein the phase detection circuit includes a level limiter circuit to limit an internal signal voltage and a reference voltage adjust circuit to correct deviations in the internal signal voltage.Type: GrantFiled: February 9, 1994Date of Patent: April 11, 1995Assignee: Hitachi, Ltd.Inventors: Yukihito Ishihara, Kazuo Yamakido, Takao Okazaki, Katsuhiro Furukawa
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Patent number: 5227795Abstract: An over-sampling analog-to-digital converter using a current switching circuit 102 as a local digital-to-analog converter, wherein a difference between the output currents Isig and Iq of a voltage-to-current converter circuit 101 and a current switching circuit is integrated by a capacitor 105 of which the one end is grounded to a dc potential VB. Further, the current switching circuit 102 has many bits to decrease the difference current between the signal current Isig and the feedback current signal Iq. Moreover, the level-shifting function of the voltage-to-current converter circuit 101 makes it possible to apparently subtract the dc component from the input analog signal Vsig which is produced based on an internally generated dc voltage as a dc bias voltage, and to decrease a change in the voltage between the electrodes of a capacitor caused by the integration of current.Type: GrantFiled: May 23, 1991Date of Patent: July 13, 1993Assignee: Hitachi, Ltd.Inventors: Kazuo Yamakido, Norimitsu Nishikawa, Katsuhiro Furukawa, Yuko Tamba, Takao Okazaki
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Patent number: 5113304Abstract: A circuit breaker includes a current detector for generator analog voltage signals in accordance with load current of respective phases and a control circuit for executing a tripping operation in response to the analog voltage signals. The control circuit includes an analog switch repeating a time division selecting operation that one of the analog phase voltage signals generated by the current detector is selectively allowed to pass through the same in a predetermined order, an analog-to-digital (A/D) converter for converting the analog voltage signal having passed through the analog switch to a corresponding digital signal, and a microcomputer receiving the digital voltage signal from the A/D converter and obtaining the effective load current value based on the digital voltage signals. The microcomputer generates a tripping order when the effective load current value exceeds a predetermined value.Type: GrantFiled: March 28, 1990Date of Patent: May 12, 1992Assignee: Kabushiki Kaisha ToshibaInventors: Masashi Ozaki, Katsuhiro Furukawa